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#1
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Help with race/barely street driven 455
A friend and I have a 455 that was previously built by a "professional". After some issues we were doing well with it in the 11.60's. Eventually it popped a rocker, damaged the stud and push rod, then the lifter. We were going to do just the top end with the butler 248/254/112 hyd roller cam, 330 cfm wideports, northwind, and the o ring intake extender. Well that got thrown out the window when we took off the e heads. In two bores there are two deep scratches so the engine needs to be bored out for sure. So now were thinking a rather large solid roller and install solid roller springs on the new hi ports.
We have the high ports, 1 7/8 dougs headers, intake, block, crank, and so on. To keep it budget friendy we are keeping the crank. I and hom have never done a solid roller. Looking for some suggestions there as far as sizing. Car is a 70 lemans with a turbo 400 prepped very nicely. Race weight is #3600 with him in it. We will be using a 950 4150 carb. The goal is deep 10's, like 10.50's. A cage is going in shortly. Any advice on cam?
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" Is wearing a helmet illegal" Mike Kerr 1-29-09 |
#2
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Going to need compression, gears/tire size, converter etc to really get a good picture. I'd talk with either Paul Knippens or Randy Repp (Pontiacspeedshop.com) for their recommendations. Randy works with Howard's Cams and can get you something custom made. Paul may very well have something...
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Johnny US Army Retired 1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
The Following User Says Thank You to Johnny406 For This Useful Post: | ||
#3
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What changes are you going to make the car 60 ft better then it was when running 11.60?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
The Following User Says Thank You to steve25 For This Useful Post: | ||
#4
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Any work on the High ports or as cast?
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#5
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When selecting a SR cam for a Pontiac block, first thing, Install Megga Brace. Not the KRE one.
When you look at a potential cam subtract the advertised duration from the @ .050 duration. You do not want anything less than 32 for a stock block. Better yet, 34-36. A cam lobe I KNOW will run forever in a stock 455 is one based off the old UD .4179 lobe. I spoke with Tim G at Bullet and this was the biggest cam I was comfortable running. I know some guys get away with a more aggressive cam in a stock block. Not worth the risk IMO. If you called Tim at Bullet and had him work up a cam using that .4179 lobe based off the rest of your combo I know it will get you below 10.50s with your High Ports Its known for being gentle. Guys run it in sbcs and with their lightweight valve train they can do it with really low spring pressure. High spring pressure and a aggressive lobe it what kills stock Pontiac blocks. |
The Following User Says Thank You to Dragncar For This Useful Post: | ||
#6
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Johnny the car has 28x10.5 pretty soft street slick I think M&H. It has a ford 9" with 390's, convertor is 3600 flashes at 5000.
Steve, we only got 15 passes and played with tire pressure obviously and rear drag shocks. We did box the lowers. Skip as cast 80cc high ports. Dragncar. We are putting a mega brace in it. Good advice! Thats pretty radical in my mind as far as that card you posted. Weve been looking at Lunatis, they have a 106 lobe sep.
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" Is wearing a helmet illegal" Mike Kerr 1-29-09 |
#7
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Quote:
I would not run a 106 cam with High Ports. My UD cam with that I ran for so long was on a 106. But that was with iron heads that flowed like 260cfm at best. You want tight lobe centers when you are trying to squeeze a crappy head. The idle on a 106 cam is pretty rough. But you have good heads so you want it at least a 110. I would go 112 The cam I posted is on a 112 with a intensity number of 34 so its safe in a stock block. I would not even think about a roller in the 250s for a 455 that is mostly strip. 250s is a street cam IMO. |
The Following User Says Thank You to Dragncar For This Useful Post: | ||
#8
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I have a similar combo in my 463 stroker. KRE 325 d-ports, northwind intake, Quickfuel 950, Lunati solid roller 262/270 . C.R. 10.5:1. Still using 1&3/4 headers until I can afford 1&7/8. I have the Progression HEI distributor which has been a big help in cleaning up the idle quality as well as unlimited timing curves. Anyway car has gone 10.72 @ 126 with little to no tuning and that was in the heat. You should have no problem getting into the 10.50s with the combo you are putting together. Good luck.
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69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car. 79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet. |
#9
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My race car is about 50# lighter than your car and goes 10.01 with the cam in my sig. My heads flow 330 cfm, use a victor/dominator and my converter flashes to 5000 rpm. You should have no issue getting to 10.5.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#10
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Thanks guys.
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" Is wearing a helmet illegal" Mike Kerr 1-29-09 |
#11
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Quote:
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#12
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Quote:
GT |
#13
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The KRE brace requires you to drill and tap holes for 5/15 bolts right on top of your cam bearing bosses. I do not like that. Also, it only "pulls down from the top". The SD brace sandwiches the lifter bores with the aluminum brace on top, fitted steel plate on bottom.
It works so well you need to be careful fitting it. It will shrink your lifter bores if you tighten the 3/8" grade 8 bolts too much. Put a lifter in the bores and make sure you have clearance while installing. No way will that KRE brace ever effect the lifter bores like the SD brace. I have one and the only time it ever might get used if I ever decide to weld it in a .060 over 67 400 block I have. Needs to be a block I would not lose sleep if it cracked while welding. If it works I might end up with a strong factory block. But its a ton of work. SD brace is the best. |
#14
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I was just going to say if you had ported heads a 1 7/8 header might not cut it.
As a reference point my first E head 455 motor 320 cfm hand ported by KRE and a Torker II 850 DP had a 259/262 UD solid roller with .556/.556 weigh 3750 through mufflers ran 10.90s @ 124. A pretty mild SR fairly streetable-just would not pass the "sniffer" for emissions at idle but would at the load test! Actually 60 ft'd better than my bigger lighter IA Camaro!
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#15
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Quote:
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" Is wearing a helmet illegal" Mike Kerr 1-29-09 |
#16
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My last motor was .060 over. 75 455 block. Ran it for years no problem. Ran 10.70-80's in a 3700 lb car. 260-266 .420 lobe solid roller. Has hundreds of runs on it ,allways ran cool. 370 gear. Ati.4600 8" converter. E heads. 1.5 rocker. Victor/950.1 7/8 dougs 3" exhaust.. wouldnt be afraid of .060. But should probably check wall thickness. I didn't.
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#17
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they were attacht. I'll have to try one now, next time at Norwalk I'll get one from Butler. GT |
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