SS vs "Stock" heads
 

Wondering opinions on how much difference there would be between a fully CNC prepped set of LT1 heads vs a more Stock Eliminator style with nice valves and valve job, and setting cc's at spec?
Would be a nice SS short block and Hogans intake. I had a beautiful set of heads that were destroyed when a valve broke, and doing another set isn't in the budget right now.
Would it be a waste of time not going all the way?
Would it be off .100? .200? .500?
Thanks

Re: SS vs "Stock" heads
 

Dave Layer would know better than anybody. But If your talking a fast set of race prepped aluminum Stock Eliminator LT1 heads I don't think the difference will be as drastic as many would expect. Lots of work hidden in "Stock" LT1 heads.

Re: SS vs "Stock" heads
 

Mark a good set of lt1 stock heads at 200 ss are9 cfm better 300 +6 400+17 500+35 never flowed the stockers any higher .your likey to lose 40 hp or more. But that my guess,no data to back it up. Jim Hanig

Re: SS vs "Stock" heads
 

You haven't given the particulars of the SS head over the Stock head but shootin' from the hip, I'd sat .200-.300 range. That's assuming the Stock heads get the good valve springs for the SS cam and the Stock heads don't stall at .600" and you've got an .800" cam.

Re: SS vs "Stock" heads
 

Hi Mark:

I P&P a set of Iron LT1 Heads including combustion chamber.
Before doing so contacted Joe Mondello for Porting advice, following them to the letter.
He wrote an article about them a year later.

They have the Vortec Intake and used Stock 1.94/1.50 High Flow Valves.
Later that year lent them for our Pinks All Out Team project after their 383 blew.
They got a junk yard LT1 Block and used their Comp 503 Cam.

The car was a 95 Caprice look alike SS which ran a best of 12.10 in the Summer.
Got the heads back after that engine expired.

They replaced that engine with a Corvette LT1 with Aluminum heads using the same cam.
The car ran consistent 12.80s with an occasional 12.70.

See 2 attachments..
When the Engines lost oil the Valve Stems got scuffed and the Head needed new Valves and Guides.
These have the upgraded 2.02/1.60 Valves and use Howard ElectroPolished Springs.



Dan