[DogMeister]

In my '67 GTO:
461 long rod stroker built from a '69 400 YB block
Scat 4.25" crank, balanced with flywheel attached
KB 4.15" flat top pistons
6.800" H-beam rods
Stock #45 heads (small valve, 94CC)
Melling SPC-5 flat tappet cam (like the old 067 or 068 Pontiac grinds)
Hydraulic lifters
Stock intake
Hedman shorty ceramic coated headers
ARP fasteners throughout
Underdrive pulleys
Assembled by me
850 cfm QuadraJet
Tremec TKO-600 w/ 0.64 OD
GM 8.2" 10-bolt 3.55 wth Auburn Gear posi
Holley electric fuel pump (VERY loud, will be replaced with a quieter one)

[Lee]

Here are the general specs on motor I consulted/assisted with, and tuned on my chassis dyno yesterday.

'79 T/A, 400 4spd

- Basic 400 shortblock (built by Len Williams, generic SpeedPro flat-top 4-relief pistons), no exotic or custom parts.
- 6X-4 heads ported by Dave @ SD Performance to ~256cfm @ .550", exhaust crossovers filled, then small hole drilled to provide small amount of heat to intake.
- Box stock Edelbrock Performer
- Custom Q-jet
- HEI distributor
- 2.5 RARE exhaust manifolds
- Lunati HR lifters (no noise)
- 224/236 on a 115 LSA (custom ground, spec'ed by me, to maximize the heads.

Compression ratio ended up being right at 8.3:1. We had wanted 9.0-9.2, but "something" got confused with Mr. Williams about piston selection - so we decided to see what we could get with what we had.

I tweaked the timing, secondary airdoor tension, and (to my surprise) had to go with much richer metering rods (started with CV, ended with AX). With the scoop and aircleaner removed, we got a best of:
312hp and 384tq at the wheels.

Very broad tq and hp curves. HP peaked about 4900, but was still pulling nicely at 5300. I'll try to post a scan later on.

NOTE to T/A owners: The hoodscoop had been opened, but there was a "mesh" insert that covered the opening to block out leaves and such. We lost right at 10hp and 9tq with this aircleaner/filter/scoop installed.

[AdamIsAdam]

ok, I can FINALLY post here. Just got my car last week.

Please PM me your thoughts on:
1. what kind of HP you think it makes.
2. what ET you would expect out of it.
3. what redline I should use.

I hope to get it to the chassis dyno and then to the track this year.

The car is my 1964 Lemans. Here are the specs...

• 1970 Pontiac 400

o Bored and stroked to 469ci
o Eagle crank
o “H” beam, rods
o Ross Pistons
o Fully balanced by Butler Performance
o 10.4:1 CR
o Engine completely deburred
o All oil passages chamfered
o Cam: CompCam XE274H-10
 Adv Dur: 274 Int; 286 Exh
 Lobe Sep: 110
 Lift: 488 Int; 491 Exh
o Heads (#46 with screw in studs)
 Ferrea Valves (Int: 2.11; Exh: 1.77)
 255 cfm at 527 lift
 1.65 roller rockers by C.A.T.
 Comp Cams double springs
 Ported and polished
 Port matched to intake
 Screw in studs
 Brass guides
o Edelbrock Performer intake
o Barry Gant 780 CFM carb
o MSD 6n electronic ignition
o High flow Aluminum Racing Radiator

• Clutch, Transmission, rear

o McLeod Racing 75221-Super Street Pro Clutch
o Lakewood scatter shield
o Muncie M21 fully rebuild 4 speed
o Hurst Completion Plus shifter
o Dual drive shaft safety loops
o Eaton Posi Unit
o 3.42 Motive Gears (25.8” Nitto drag radials)
o Timken racing axles

• Brakes & Suspension

o Full Eibach suspension kit
o Poly bushings
o KYB Gas charged shocks
o Right Stuff Power Disc brake conversion Kit
o 2 stage power brake cylinder

[goatwgn]

Originally Posted by goatwgn

'73 Pontiac 455 bored .030. (462 ci)[LIST=1][*]Polished stock crank[*]Speed pro forged pistons[*]RPM forged rods[*]Melling high volume oil pump with Milodon pickup[*]Milodon 7 qt oil pan[*]1 peice oil pan gasket[*]Graphite rear main seal[*]Stock 4x heads with 2.11 intake,1.77 exhaust stainless steel valves[*]Valve pockets on heads opened up for 1.77 exhaust valves, opening on top of center "crossover" port in rh head filled to mount older intake.[*]1971 GM 1 cast iron intake with Quadrajet[*]Melling RA IV camshaft advanced 4 degrees[*]Sealed Power lifters, Comp cam pushrods[*]Comp cams 1.52 roller tipped rockers[*]PPR valley pan[*]Evans coolant pump[*]Ram Air Specialties 2.5 inch manifolds for 64-67 chassis into dual 2.5 inch exhaust with H pipe-Gray ceramic coated[*]75 Pontiac HEI with recurve kit, adj vacuum advance[*]Compression at 9.5 to 1.[*]Machine work, balancing, etc. done by CVMS. Engine runs very strong on the street in my '66 Tempest wagon. Runs cool with AC on and has good oil pressure. has a little lope to the idle, but also returns about 17 mpg on the highway (Also has a 2004r with billet parts in it that helps with the highway rpms) (3.42 gear) this combo helps maintain a "stock" underhood appearance as well. Can also run any gas from the pump I like in it.

Since posting this I have switched to a Comp Cams DEH 275 (dual energy grind) .462 intake/.480 exhaust 219/228 @ .050 110deg lobe seperation. Also have a GV overdrive behind the old TH400 in place of the TH2004r. This is a more streetable combo than before, but runs very strong still.

[paul s.]

Here is a 488 "Heritage Series" stroker I just finished for Craig B. in Minnesota. Engine has a few substitutions from standard such as the ported Holley Street Dominator intake manifold and custom ground solid roller based on our Stage 5 hydraulic roller. The SEAN MURPHY INDUCTION Quadzilla got the nod for carburetion as the carb supplied was SHOT. Owner supplied the ignition components.

My feelings would be hurt if it didn't put out at least 575-580.

Here is a quick video of the idle with open headers... TURN UP THE BASS!

https://www.youtube.com/watch?v=Pct1oerAW9o

Some particulars are

• ported 670 heads
• 10:1 compression
• 248/256 solid roller w/ .600" lift
• stainless rocker arm
• repro chrome valve covers
• forged eagle 4.5" stroke crank
• forged eagle h-beams
• dished forged pistons
• ported holley street dominator
• 900 cfm SMI quadzilla q-jet
• cloyes timing chain
• bop 1 piece oil pan gasket
• bop composite distributor gear
• felpro 1016 gaskets
• smith bros restricted pushrods
• ferrea valves
• viton valve stem seals

[b-man]

Guys, please refer to the first post in this thread.

This purely an archive thread, not a Q&A or discussion thread.

All off-topic posts will soon be deleted.

Post engine combos ONLY please.

[Burningbird]

Recently finished a 406 build for my ´70 Firebird, motor has about 150 miles so far.

*´68 400 WS block (360hp GTO). Block bored .030" and honed with stress plate, deck squared, front oil gallery holes tapped for 3/8 NTP pipe plugs, a .030" hole has been drilled in the pipe plug toward cam gear in the front and one toward distributor gear in the rear, casting flashes has been removed inside the block.

*TRW/SpeedPro .030" with polished piston tops, .003" down in the hole.

*Tomahawk H-beam rods from PPR.

*Std crankshaft turned .010"/.010" with chamfered oil holes and casting flashes removed. Rotating assembly balanced.

*#16 heads ported to flow approximately 250/210 @ .500 lift. Ferrea 2.11"/1,77" valves, 3-angle valve job, K-line valve guides, HD std springs from Spotts, positive valve stem seal on all 16 valves, heads cut against the block and intake side and chambers enlarged to 75cc, all casting flashes removed and pushrod holes elongated. Comp 1.65 roller tip rockers on 7/16 ARP-studs. SCR is 10.07:1.

*Std ´68 intake port matched. ´73 Quadrajet custom built by Kenth on this forum.

*SPC-7/068 cam and Summit double roller gear set.

*´73 455 distributor with Pertronix conversion.

*80gph fuel pump from PPR.

*Melling 54ds oil pump and Clevite 77 bearings.

*Flowtech 1 5/8" headers welded and port matched to gaskets.

The motor is built by me except for the carb and machine work Desktop dyno calculates about 400HP/460ft.lbs

[Hooter]

Now that I've got mine up and running, here's the motor going in my 65 Lemans for Drag Week next month:

565 pump gas motor
MR1 block 4.35 bore
Ohio forged 4.75 crank. Omicron polished and IPN treated. Throws clearanced for pistons.
Roland Racing CV-1 heads ported by Bill Anderson
Manley 6.7 rods
Wiseco dished pistons. Little over 11:1 compression
Comp 4/7 swap cam. Need to confirm cam card but around 274/278 and .430 lobe on 114
Comp 1.8 rockers. Ultra Pro Magnums
1050 dominator
Moroso 8 quart pan
MSD dist
Crappy Hedman 2" headers with 3.5 collectors

Turbo 400 and 3.70 gear. Idles under 1,000 rpm's and I'm finding traction to be an issue on the street with my drag radials. Hope to take to the track next weekend. Hope I can get it to hook up.

[Squidward]

Here is my 67 Firebird combo...

69 350P, from a 69 2bbl Firebird, complete motor of unknown history from Craigslist ("...it was running when we swapped it out for a 400").

Upgrades before motor install was swapping intake/carb for a 4bbl setup, with new cam/lifters/timing set.

47 heads
Professional Products Crosswind intake (knockoff of Performer RPM)
72 Buick 350 Qjet, Cliff's throttle shaft repair, accelerator pump, and hi flo needle/seat.
HEI, Crane adjustable advance kit.
Summit 2800 cam
TH350 upgraded to V8 clutch specs and hardened roller clutch. Transgo kit.
Hughes GM20BPOHD (2000 stall) converter
BOP 8.2 rear, 3.23's, Powertrax No Slip locker (new install last week)

Best ET/mph so far was my last time out. Ran 15.018 @ 90.79 with soft launch on an open rear. Should be 14's next time out!

[421Fuellie]

Let’s start with some background info, The car (62 Bonneville Convertible) was built by my stepfather in stages over the years. He bought it off a "C" lot in South Tacoma for $1200 in 1989. The car was stock at that point. I think it was the early 2000's he built the Tri Power engine and T400. I never did find a build sheet for the engine so until I tear it down all internals are a mystery. He always had trouble with the tired carbs but eventually got it running decent enough to take a cross country tour with my Mom and a 59 Scotty Tear drop.

We lost him to Leukemia in 2007 and after a few years my mom was ready to part with the car. "Bonnie Girl" or "The mistress" now lives with me (My girlfriend has started calling her the mistress more often than not for some reason?)
As I began addressing the carburation issue I saw he had it tuned very fat, it smelled badly after shutting it off and had difficulties restarting. After leaning it out I discovered why he had it fat. The engine would go dead lean on anything other than a mild acceleration. I worked with a Tri power guy to resolve those issues but it was apparent to me these old carbs would need replaced (they had been professionally rebuilt once). About that time I had a carb fire due to a stuck float and nearly burnt the car down! I knew it was time for a update but everybody that sees this car loves the Tri Power so I didn't want to give up on the theme. After some consideration of putting one of the new bolt on Fuel injection kits in the car I had the thought that I could keep the Tri Power and just run the fuel through the injectors! Hence my moniker 421 Fuellie

Its been a long, tough, expensive, project but the end result is well worth it! Some will love it for its new direction and twist on convention and some will hate it because it defiles its nostalgic roots and that's exactly what I was looking for!

http://youtu.be/7kgdAi3VIjM

Aluminum Intake Tri Power (8782898 ?) any additional info would be appreciated. Is this a re-cast of a factory part? I can’t identify the part number.
The intake has been machined for Electronic Fuel injection bungs, Manifold air temp sensors and Manifold Air Pressure sensor.
All internals and fuel was removed from each carb making them Air doors only. Center carb base plate was re-machined to add a Throttle Position Sensor.
With careful planning I was able to reuse all the stock linkage with minor mods to tuck in in closer to the carbs!
Holley XFI running fuel and spark
Holley Crank trigger and a 60-2 wheel
Aeromotive in tank EFI fuel pump
Mallory Hi-fire spark box and Coil (Holley XFI controlled)
Block is 70/74 .060 over 400 (481988)
Heads are a 67 400 with no traditional ID numbers but a D147 date code (Pics available)
Cam size unknown but it has a very lumpy idle and poor braking from time to time! (Next thing to fix!)
All other internals are unknown.
Longbranch Headers
2.5" duels and cross over.

[455rebel]

455 out of a 80,000 mile Bonnie
Striped down and cleaned with gunk and a hose
Removed ridge in cyl and honed with a dingelberry hone
Crank polished
Soaked pistons in brake fluid to de carbon,broke rings to clean ring grove
New main and rod bearings, std
New oil pump and gasket set! File to fit rings
400 heads cut 20 thousands,(145-150 psi),3 angle valve grind
Stock ci intake and ex, both port matched
Reworked the stock 1973 q-jet
2.5 duals to dynomax mufflers
Lunati voo doo tq monster 10510702 cam 1300-5500 rpm
Comp roller tip rockers and springs
New timing chain and water pump
Turbo 400 ,shift kit, and gov modded to shift at 5000-5100 rpm in drive
3.15 posi, stock converter
Car weight 3700lb
Best 1/8 et 8.90 on street tires leaving at 1000-1100rpm on stall,on street tires.
Ps I have a holley 800dp swap meet carb rebuilt,it is quicker with this carb by seat of pants feel, never had it at the track yet,but winter driving and mpg suck...
This ugly old 4-door has surprised many a young man at a red light!!!
I have more fun in this thing than any of my other rides.

[John Milner]

Engine for my '66 Tempest convertible. '66 YH 421, .030 TRW 428 pistons, stock rods with arp bolts, 744 camshaft, 092 heads with stock valves and crower 68404 springs, ram air manifolds, 1965 tripower. Car runs an M21 4 speed and 3:90 positrac. It is a great street motor. No 1/4 miles times. Idles nicely with a slight loap and doesn't overheat. Has plenty of low end torque.

[EOD9339]

Here's my 462 that's in my 77 TA. I tried to go with a stock sleeper look.

455 bored .030 over, 6x-4 heads mild port and exhaust enlarged to 1.77, gasket matched, zero decked, forged eagle H beam rods, TRW forged pistons, comp cams XE274, 1969 Pontiac intake with Q-jet, long tube headers into X pipe true dules.

Car is a runner that stays cool.

[General Z]

Firebird Spec List

Vehicle Weight: Around 3600-4000 pounds

Engine: 1970 455 Block, bored .060
Bore: 4.2109, Stroke: 4.21

Crank: Pontiac factory crank, ground .010 on rods and mains

Pistons: Sealed Power forged pistons

Rods: RPM International forged rods

Heads: 1971 400 Heads, Code 96
Mildly Ported, Stainless Steel Valves, Comp Cams 988-16 Dual Springs
96cc, Valves 2.11/1.77
Comp Cams roller rockers, Ratio: 1.52. I think they are Magnum.

Push Rods: Unknown

Compression Ratio: 9.53:1

Intake: Edelbrock Performer, dual plane, port matched

Lifters: Summit Hydraulic

Cam: Summit Racing 2802
Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:2,200-5,500
Intake Duration at 050 inch Lift:224
Exhaust Duration at 050 inch Lift:234
Duration at 050 inch Lift:224 int./234 exh.
Advertised Intake Duration:298
Advertised Exhaust Duration:303
Advertised Duration:298 int./303 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.466 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.488 in.
Valve Lift with Factory Rocker Arm Ratio:0.466 int./0.488 exh.
Lobe Separation (degrees):114

Carb: Holley 0-3310S 750cfm 4-bbl with electric choke. Using ½” divided carb spacer and Holley heat shield, upgraded accelerator pump and power valve.

Ignition: Performance Distributors HEI, custom curved for my application.
Vacuum Advance: Part# VC1852 Cross part# AR22 Specs: Starts at 7-9, Max 5 @ 12-14 Application: 77-78 305/350/400 Chev Truck, Heavy Duty, 1975-76 350/400 Chev Truck Heavy Duty

Timing: 38 degrees total timing

Idle Vacuum: 16 inches

Alternator: 108 amp, 1984 Chevy Impala, clocked to 3 o’clock, purchased at O’Reilly.

Spark Plugs: Autolite #85 gapped to .040

Oil Pump: MEL-M54DS 60 psi. Installed smaller check ball and shimmed spring. Drilled weep hole in gear. Doubled up base plates.

Rear End: 3.73 Gear ratio – Chevrolet 12 bolt with positraction.

Rear Tires: 255-60-15

Accessories: Power Steering, Power Brakes

Radiator: Aluminum 4 core, big block with Lincoln Mark VIII electric fan

Transmission: 700R4

Torque Converter: Unknown

Exhaust: Hedman Headers, Dual 3” exhaust with H pipe

Oil: Rotella T 15W-40, 5.5 quarts, plus a bottle of Comp Cams additive 159; Filter: K&N 2003 or 2006

Cooling: Did the 421 modification, plugging head holes and drilling others to help with cooling.
180 degree Superstat thermostat. Steam holes drilled at top of divider plate.

Fuel: 93 octane. Holley Red, electric pump. High flow Summit Racing fuel filter.

[69FIREBIRD76MM]

69 firebird, 3400 lbs.
455 .040 trw forged pistons
stock rods with aftermarket bolts
factory 4 bolt block
#62 heads unported, SS R/A IV Valves, #995 comp springs
Comp Cams 51-316-4 296-305, 246-253 .050, .510-.525 1.5 roller rockers
installed straight up
th400, 3800 stall
Dana 60, 3.73
car was driven to the track to run 1/8 mile
Best performance was 7.60 at 86 mph
1.60 60 ft.
car pulled hard but not sure what the problem was at the top end, it felt like it lost power. the sixty foot tell me it could had run low 7's

Motor lost compression, So I am now rebuilding another motor for turbo.

[John Milner]

'65 YH 421 bored to standard bore 428.
TRW Forged Pistons on 455 SD rods
"N" crankshaft
'70 614 ram air iv heads ported with crower springs
tc-02 camshaft (236/244@.050,.510/.515, 112 LSA)
1.65 ram air iv rockers and pushrods
aluminum ram air iv intake
re-worked '74 quadrajet carb
doug's headers
2.5 inch flowmaster exhaust
'74 Borg Warner super t10 4 speed
3:73 positrac

Car is a '74 GTO.

[Sprocket]

The last tested iteration of my '70 GP:

mid-70's 455 +0.030"
stock crank, rods, 2-bolt main caps, and windage tray
4X, 98cc, 2.11/1.77 stainless valves, competition valve job, unported
CompCams Magnum roller-tipped 1.52 rocker arms
Ultradyne 280/288, 223/231, .463/.485, 110 LSA, 104 ICL, hydraulic flat
Crane XR700 electronic ignition running through factory points distributor
Crane PS50 coil
Taylor 8mm plugwires
Edlebrock RPM intake, unported
Holley 4150HP 750 cfm
Holley 110gph mechanical fuel pump, stock fuel lines, pickup, and tank
WFO air cleaner with 4" tall filter
GTO-style Ram Air exhaust manifolds - 2-1/4" outlets - no porting
2.5" full mandrel bent exhaust with X-crossover
Goerlich Xlerator mufflers
TH400 w/ Continental "Jim Hand Special" converter
3.42 12-bolt Eaton posi
M/T ET Streets 28x12.5-15 on Weld 15x10 wheels
Stock front suspension with sway bar
Boxed rear control arms with solid bushings - no sway bar
KYB gas-a-just shocks
Has a/c, p/s, p/b, stock clutch fan, and FlowKooler water pump
Factory 4 row radiator
Car weighs at least 4500 lbs with me and gas in it
93 octane pump gas

Ran a best of 13.00 at 100 mph in Ennis TX in 95+ degree heat. Over six runs, ran a consistent 13.10 +/- at 99-100 mph.

Current combination to be tested soon. Stay tuned!

[69goatboy]

Here's mine:

.030" over '70 YD 400 block
H-Beam rods, forged slugs, stock crank
#31 (RA I) heads
Comp Cams XR288HR (236/242, .520/.540, 110 lsa)
Comp Cams Magnum roller rockers (1.5)
Comp Cams HR lifters 857-16
Pontiac intake, '71 Q-jet
Ported RARE exhaust manifolds
2-1/2" RARE X-pipe exhaust, 14" Goerlich xlerator mufflers
M-20 MT
N case 10.2 r/e with 3.55 safe-t-track
Front: M/T Sportsman 235/60/15's on Chrome Ralley II 15"x7"
Rear: M/T Sportsman 275/60/15's on Chrome Ralley II 15"x8"
Front Susp: Stock but with E-brock IAS shocks and Hotchkis lowering springs
Rear Susp: BMR tubular lowers and adj uppers with IAS shocks and Hotchkis lowering springs.

[pontibeast]

This has been waiting since 2001 so it damn well better be worth it

1973 455 standard bore
original n crank cut .010 over
Windage tray and crank scraper with HO pump(60psi)
6X-8 heads ported to 263/220 and milled to 90cc for 9.78 SCR
Cross over filled with aluminum
Stainless Ferrea valves with an upgrade to 1.77 exhaust
Hardened exhaust seats and Comp springs set up for the cam
Stump Puller HR 230/236@.050 590/592 lift with 1.5 roller tip rockers
Crower Hippo solid roller lifters
Performer RPM port matched/light port job and milled to match the 8cc mill on heads
800 cfm Quadrajet by SMI Stage 3 set up to match engine and car requirement
MSD 6Al box with Mallory distributor tuned and setup by SunTuned
Composite distributor gear
RobbMc 550HP fuel pump, 1/2" PU and filters
-8AN lines from tank to pump and -6AN lines from pump to carb
Hooker Super Comp ceramic coated 1 3/4" headers into a 2 1/2" Flowmaster setup with H pipe and Flowmaster mufflers
8.2" Pontiac rear with Auburn Posi and Richmond 3.55 gears
Driveshaft safety loop
BOP TH400 trans with new Continental 3000 stall converter from Cliff Ruggles
B and M shift improver kit and B and M Quick shift shifter

Engine had only dyno time on it when I bought it and dyno'd at 390HP with a much smaller Hydraulic cam and stock 4x heads that cc'd at 114. It is currently being installed in my 1971 Lemans Sport and will be chassis dyno'd by a member here(p4msi1) to help fine tune the carb and timing. Once it is broken in I will take it up to my local 1/8 mile track to dial in the rest of the combo as far as suspension and tires go. It will be my daily driver and I am hoping for at least 450HP/500TQ and running at least a mid 12 in the quarter.
I will come back and edit with actual dyno numbers and track time when it is done.
Thank you to all of you here on PY that gave me a lot of advice and the many of you that worked with me on prices for parts(65Warrior, HWYSTR455, SunTuned, Rich D, Cliff R, Jonesy and I'm sure I am forgetting someone but my PM box got deleted and my memory is not what it used to be). Without the help from members here on PY this engine most likely would have never happened or if it did it would be way less power than what I am expecting here.

[6D9]

461
10.5 TO 1 comp
Scat crank/rods
Bulter ported Edelbrock heads.....315 cfm peak flow
Edelbrock Performer rpm intake
Holley 850 DP
Dougs 1 7/8 longtubes
3" mandrel exhaust...X pipe...Dynomax Ultraflows
MSD 6AL/Msd Probillet dizzy
Comp HR....236/242 at .050....520/540 lift....110 lsa

TH350..shift kit....10" 3200 stall
8.2 10 bolt 3.55 posi
275/60/15 MT drag radial

Best ET......11.56 at 115.8.........1.65 60 foot
Full weight 66 GTO