#41  
Old 08-07-2021, 05:32 PM
AG's Avatar
AG AG is offline
Ultimate Warrior
 
Join Date: Feb 2000
Location: NH
Posts: 3,240
Default

Quote:
Originally Posted by b-man View Post
455 200 hp 2-barrel engine was 1972 only, it used 7L4 heads and the 066 cam.
I have one in my garage complete.

__________________
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.
  #42  
Old 08-11-2021, 12:45 PM
fiedlerh's Avatar
fiedlerh fiedlerh is offline
Ultimate Warrior
 
Join Date: Feb 2002
Location: Illinois
Posts: 2,257
Default

If you need 66.5 cc #48 heads, let me know. I'll be in Missouri this weekend.

__________________
http://www.pontiacpower.org/
  #43  
Old 08-11-2021, 03:42 PM
formula kid formula kid is offline
Senior Chief
 
Join Date: Mar 2005
Posts: 300
Default

Ok, so I have not entered the discussion before. I have an original Firebird Formula 350 with WA engine code and 4C heads with AIR. Transmission is a Saginaw 4 spd 3.08 rear non posi. The HP on the car was 170 as shipped from the factory. The first thing done was to recurve the distributor with advance all in at 3K Egr was disconnected and plugged and AIR was disconnected and the pump removed. TCS switch was unplugged and the vacuum was supplied to the distributor so advance in all gears ported not full advance. Exhaust manifolds were removed and Appliance headers were installed. The rest of the exhaust was HO Racing HR-91 which gives you a true duel exhaust. The HO-91 eliminates the bottle neck in the stock muffler. The even side of the engine exit out the driver exhaust pipe and the odd exits out the passenger side. Stock 2bbl carb # 7044071 which made every thing so much sweeter. I would race 67 GTO's and 74 400 Trans Am's and a few 74 Z28's boy were they pissed when told it was a 350 2bbl, they would ask to see for themselves they just could not believe the power of the car. I did not change cams or any internals. Your 350 came with 200HP you have an 066 cam from the factory. If you need more high rpm performance switch to 67-70 2.11-1.77 heads the 68 or 69 #48 ram air heads will work great. If you don't want a head switch change your rocker arms to 1.65 rockers on the intake only and 1.50 on the exhaust and use poly-locks on all that way you change your lift and duration on the intake side .

  #44  
Old 08-11-2021, 04:06 PM
formula kid formula kid is offline
Senior Chief
 
Join Date: Mar 2005
Posts: 300
Default

Sorry cold not fit all in. Recurve your distributor and rebuild your carb. I don' t know your jet size but the primary is part# 7031968 and the rod is 7031835 secondary rod is the same for your engine with 4sd as the auto car #7047806. Also be sure to have ported advance in all your gears. If headers are out for the question get Ram Air manifolds check with others to see if they work on a GTO since I don't know .change your rear gears to 3.42 :1-4.10:1 this will get you moving quicker from a start. Change your intake form yours to an early 4bble to get rid of the EGR. As said the switch to # 48 head will change compression from the factory 8.0 to the 10.5 of the 350HO in 1969. Hope this helps and it is fun to peee on chev's and watch when you tell them it only a Pontiac 350.

  #45  
Old 08-11-2021, 05:44 PM
ponyakr's Avatar
ponyakr ponyakr is offline
Ultimate Warrior
 
Join Date: Dec 2011
Location: North Louisiana
Posts: 7,621
Default

Quote:
Originally Posted by 70badboy View Post
Hi, I have a 74 GTO with the original 350. Can that motor be juiced up the get 400 HP ? Thanks Steve
I'll add a little more, since I don't have enuff money layin around to do what I'd really like to be doing.

The '69 Tempest 350 former Stocker I bought came with the dyno sheet, showing 434hp. You could back off on the CR, & with the correct cam, still make near 400 hp, IMO.

Because of less cubes & stroke, it would obviously NOT make the big low rpm torque of a 455. But, it could make good power up past 5000 rpm.

Hey, with hard street tires, how much low end torque can you stand, unless you just wanna make lots of tire smoke ?

Another option, which has often been mentioned on this site, is using a 350 block, but with a longer stroke rotating assembly. Most just say "Stroke it".

A very popular 350 stroker build was done by Ace Brewer. IIRC, he made 462hp with it. I'll post a link, if I can find it. It ain't cheap to build, now. BUT, it does use a 350 block.

https://www.motortrend.com/how-to/hp...-engine-build/

PS: I'll add this, which I'm sure many here will disagree with. If anyone reading this, considers building a hot 350, & especially a strong 350 block stroker, I'd would NOT recommend using the last 350 block casting. IIRC, the casting number is 500810. I have one of these which was a '77 model. It still has the original 6x-4 heads & original intake. These blocks have the thin main webs, exactly like the webs of the weak 500557, 400 blocks. LOTS of these blocks have failed, when the thin webs cracked at the dowel pin holes. Every time this is mentioned, some will post about the huge power and many years of service they got when using a "557" block. So, use at your own risk. You have been warned !
Attached Thumbnails
Click image for larger version

Name:	1-557 .jpg
Views:	76
Size:	57.4 KB
ID:	571190   Click image for larger version

Name:	2-557 .jpg
Views:	107
Size:	109.6 KB
ID:	571191  


Last edited by ponyakr; 08-11-2021 at 06:03 PM.
  #46  
Old 08-11-2021, 06:10 PM
Formulas Formulas is offline
Ultimate Warrior
 
Join Date: Dec 2004
Posts: 2,659
Default

Gave a chevy guy a ride home from work he is older than me and more track time my 1970 Formula at the time 2.73 rear 350 eng #47 heads 2800 cam stock shift kit th400 Q'jet about half way home he accused me of lying about my specs

In high school a friend of mine had a 1966 326 4speed 4bbl tempest that thing was NOT night and day from my 1966 GTO 389 4bbl

Bore stroke ratio hamstrings Pontiac at upper HP efforts because of obvious bore size effecting valve / port /flow but from stock to mid HP efforts the Pontiac engine is a fine machine 326 and up

  #47  
Old 08-11-2021, 10:17 PM
ponyakr's Avatar
ponyakr ponyakr is offline
Ultimate Warrior
 
Join Date: Dec 2011
Location: North Louisiana
Posts: 7,621
Default

Quote:
Originally Posted by PunchT37 View Post
There was a 2bbl 455 in `71 also. 280 hp
Yeah, I bought one that came out of a '71 Safari wagon. The seller said that it would smoke the right rear.

I must now apologize for posting a link that had already been posted earlier in the thread. I'd just skimmed thru the thread & saw that most of the talk was about 400 & larger engines.

I reminded myself of how so many will ask some dumb question about something I have for sale. It don't really matter how many details you include in your ad. There will still be guys who don't take the time to actually read the entire ad. Those guys will just see the main heading & start asking questions.

And, as I discovered, SOME of these guys will get real mad & throw F-bombs at you if you point out to them that you already answered their question in your ad.

I've had enuff grief trying to sell some items, I wish I'd just give 'em away, or threw 'em in a dumpster. Some sales are just not worth the effort/hassle.


Last edited by ponyakr; 08-11-2021 at 10:22 PM.
  #48  
Old 08-11-2021, 11:06 PM
i82much's Avatar
i82much i82much is offline
Ultimate Warrior
 
Join Date: Dec 2005
Posts: 2,786
Default

i had a 350 chevy with unported 041 heads and a crane fireball hyd flat tappet in my 65 GTO years ago, and it was way faster than the IA2 505 with ported e-heads and old faithful that I replaced it with. True story!


  #49  
Old 08-12-2021, 06:45 AM
Cliff R's Avatar
Cliff R Cliff R is offline
Ultimate Warrior
 
Join Date: Nov 2000
Location: Mount Vernon, Ohio 43050
Posts: 17,972
Default

I don't doubt that at all, it probably hooked up better on the street with the SBC 350 vs the tire roasting IA2 505........

__________________
If you can read this, thank a teacher. If you can read this in English, thank a Veteran!
https://cliffshighperformance.com/
73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
  #50  
Old 08-12-2021, 04:55 PM
i82much's Avatar
i82much i82much is offline
Ultimate Warrior
 
Join Date: Dec 2005
Posts: 2,786
Default

Quote:
Originally Posted by Cliff R View Post
I don't doubt that at all, it probably hooked up better on the street with the SBC 350 vs the tire roasting IA2 505........
it's not close, the chevy had way less power ... obviously. with 275/60r15 firehawks on the back, it doesn't do too bad for traction but those tires need to go, they are old. looks like either cooper or BFG is the only game in town for a street tire so I have a feeling traction will be less than with the firehawks ...

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:16 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017