SS vs "Stock" heads

[Mark Faul]

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

[Ed Wright]

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.

[Jim Hanig]

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

[Jeff Lee]

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.

[Dan Fahey]

Originally Posted by Mark Faul

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

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