Re: Need help guys, engine gurus PLEASE!
 

Nope, that was the only variation from an "as delivered" L-72...I wanted to see exactly what someone would have gotten had they ordered an L-72 car back in '69. Instead of the .018"-.020" shim I used the .038" Fel-Pro composite, but did take a bit off the heads. The heads were around a 112cc average (I believe they're supposed to be 107cc), the piston domes (TRW) were around 28cc (supposed to be 34cc), and the slugs were somewhere around .015" in the hole (can't remember that spec exactly). Not exactly the specs I expected to find!

But, that engine still hit 425hp on the engine dyno through stock exhaust manifolds/head pipes with the factory L-72 cam, and pushed our 3800lb. Camaro to a 12.79@108+, all on Polyglass tires...and it was bracket car consistent to boot.

We blue-printed our latest L-72 and picked up about 55hp at the flywheel...

Re: Need help guys, engine gurus PLEASE!
 

With his back problems I was recomending he drop it back to near stock L-72 or LS-6 spec's just to not cause any problems with his back.

Those stock motors are no slouch on the street. Since I am familar with traffic in Dallas I was also considering the mess that can cause.

I was just thinking of a less radical cam and compression for his condition.

Re: Need help guys, engine gurus PLEASE!
 

Eric & Rob I'm going to have to pull engine down to see pistons and head gskts and maybe cc size.your help is completly what i expected from this site. you guys are great.I can't get anyone to talk to me down here.the car did go at motorplex 12.189 @118 mph off the foot brake spinning slightly and lifting front wheels 3.5 to 4.0" with 29x11 hoosiers.I go about 325lbs. All steel except 6"glass hood.w/full int.and 8 point mild steel cage.picture to follow thanks again i'll definitly be in touch.thanks mark b. https://www.yenko.net/ubbthreads/imag...ns/worship.gif https://www.yenko.net/ubbthreads/imag...ns/worship.gif https://www.yenko.net/ubbthreads/imag...ns/worship.gif

Re: Need help guys, engine gurus PLEASE!
 

Heres a shot of engine

Re: Need help guys, engine gurus PLEASE!
 

12.70's with a basically stock motor, iron manifolds and Polyglas tires...that is so cool it hurts. https://www.yenko.net/ubbthreads/imag...mlins/grin.gif

This whole Pure Stock/F.A.S.T. thing is the greatest thing to come along since PB&J sammiches and chocolate milk.

Makes you realize that some of the #'s people used to run with these cars are NOT embellished magazine hype as some people would like us to believe. Given a good driver and some sensible tuning, these cars flat-out hauled a$$.

If I may digress for a moment...

The local street king around here when I was a kid was a certified Pontiac nut, had several stout GTO's, most all of which were essentially stock and near show quality.

Perhaps the 2 hottest cars he had were a black `65 GTO which was "supposedly" a 4-speed 389 tripower (inside word was it was actually a 421) and a blue 4-speed `66 convertible 389 tripower car. He absolutely cleaned up with those 2 cars, taking down plenty of legit low 13-high 12 second cars. (this was nearly 20 years ago when a 13 second street car was still considered fast lol)

The black `65 was definitely the quicker of the 2, but the blue ragtop was no slouch either. Those cars still had OEM manifolds and stock sized bias ply tires on them, but they were well tuned and the guy was a superb driver. No one ever believed those cars were even close to stock, but they were. Just goes to show how impressive factory iron can be.

Sorry for straying off-topic, just wanted to share that.

Back to the subject. https://www.yenko.net/ubbthreads/imag...lins/smile.gif

Eric https://www.yenko.net/ubbthreads/imag...lins/beers.gif

Re: Need help guys, engine gurus PLEASE!
 

Mark;

Looks like a sweet ride!

Here's a couple of shots of my "endless money pit" `67 Chevelle.

Re: Need help guys, engine gurus PLEASE!
 

conv.in car is 5000 trans king out of houston.3500 conv is GER.brand new in box from friend for free he owes me.thanks to pantera as well my back is ok its my neck but it's fused nicely.no problems now.just cant race off the trans brake or garuntee no accidents to doctor. Mark B. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Re: Need help guys, engine gurus PLEASE!
 

572" motor, +/- 800 HP on pump gas. Eventually will get Big Cheif heads, shooting for +/- 900 HP next time around.

Re: Need help guys, engine gurus PLEASE!
 

gorgous car wanna trade pit for pit I look like a bull in a china closet in my car.lol lol https://www.yenko.net/ubbthreads/imag...mlins/haha.gif https://www.yenko.net/ubbthreads/imag...mlins/haha.gif https://www.yenko.net/ubbthreads/imag...mlins/haha.gif