head work
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 977
Likes: 1
From: wash. dc
the engine is stock as far as i know... the block hasn't been decked and i don't know if there's been a cam change. but i will be installing a lunati cam while i have the heads off.
Safety Car
Joined: Oct 2004
Posts: 3,921
Likes: 731
From: Youngstown Ohio
Get whoever is milling your heads to correct for manifold fit, also. There is a formula for correction per amount milled but I don't have it handy (maybe someone can chime in). When AFR milled mine, they made the intake angle correction so any stock angled intake bolts on with no modification.
Pro
Joined: Jun 2005
Posts: 540
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St. Jude Donor '09, '24
Originally Posted by 71redskin
the engine is stock as far as i know... the block hasn't been decked and i don't know if there's been a cam change. but i will be installing a lunati cam while i have the heads off.
What are the specs for the cam you are going to be installing? Porting and polishing will only help if the cam and CR support the extra fuel and use it efficently. If this is going to be used as a street car with under a .500 gross lift cam 9.5 CR might be best to leave the ports alone and just clean them up. You can actually lose tourque(HP) by haveing a huge intake runner in the manifold and no cam and CR to support it's use. The oval port heads are a very good head for the street. Square ports heads will flow more above 6500 rpms then the oval ports. If you're not going to be running 6500 rpms 70% of the time stick with the oval poarts use the money for something else, houstonvett
Last edited by houstonvett; May 11, 2006 at 09:51 PM.
Racer
Joined: Aug 2002
Posts: 289
Likes: 0
From: Albuquerque NM
Try a Comp Cams P/N 11-246-3 Hydraulic Cam Flat Tappet....a good dual pattern cam for the BB,,,,,Just set and forget it! Better with a 4spd than turbo 400. Are you going to be adding headers? They will help the upper end a bit....additionally they will boost midrange torque.
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 977
Likes: 1
From: wash. dc
Originally Posted by houstonvett
What are the specs for the cam you are going to be installing? Porting and polishing will only help if the cam and CR support the extra fuel and use it efficently. If this is going to be used as a street car with under a .500 gross lift cam 9.5 CR might be best to leave the ports alone and just clean them up. You can actually lose tourque(HP) by haveing a huge intake runner in the manifold and no cam and CR to support it's use. The oval port heads are a very good head for the street. Square ports heads will flow more above 6500 rpms then the oval ports. If you're not going to be running 6500 rpms 70% of the time stick with the oval poarts use the money for something else, houstonvett
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Pro
Joined: Jun 2005
Posts: 540
Likes: 4
St. Jude Donor '09, '24
If it is going to be a street motor I would stay with the oval port heads and maybe go to a bigger intake valve. 2.25 should do the trick. You want your intake syatem to be 99% efficent in what the cylinder burns in the combustion cycle. Fuel that doesn't combust in the cylinder decreases HP. Should be a very nice street engine when you are done, good low end and midrange HP, houstonvett
Le Mans Master
Joined: Oct 2002
Posts: 7,098
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From: Las Vegas - Just stop perpetuating myths please.
Why do u want to raise the c.r.?
Originally Posted by 71redskin
i'm about to get the heads ported and polished on my 71BB. my?... how much can i mill from the heads to raise CR without also having to do the intake manifold too.
But my 2 cents are a good (3 or 4) angle vlv job and pocket porting are the most cost effective and should help.
So what happened to that electrical problem? I thought i read it turned into a broken fuel pump.
Sounds now like u just can't let that cam sit on the shelf anylonger.
Hope u can afford new tires often too.
cardo0