Will I be ok running these headgaskets on my 93 Lt1 383 with a 250-300shot? It wont be sprayed all the time just whenever I know Ill need it. Im going to get these from cmotorsports.com heres the part # and description.

# PEC-FelPro-1074 (Fel Pro LT1 Head Gasket .039" Thickness)

 

That big of a shot why not look into the Cometic? You can get them in .040 thickness.

 

Already had my motor designed for that thickness. Do you not think they will handle that much power?

 

I have only heard good things about the Cometic. It will set you back about $75 bucks depending on bore. I dont think .01 is going to make a difference.
Why not get the best after spending that much money already. The Fel-Pro will work, but I like to overbuild so I know its going to last.

 

Where can I get these headgaskets from?

 

Do a search for the name Cometic. Scoggin Dickey carries them. I have even seen sets on Ebay. The only bad thing, Summit or Jegs dont have them.

And opps, I meant .001 difference in thickness.

 

Do they make them in .039 thickness and 4.030 bore?

 

The only thing I can find in thier catalog is .040 thickness. They do have them for 4.030 bore, but they are SBC style. The 2 they list for LT1 are 4.040, 4.110 bore, both at .040 thickness.

 

Where can you find them for $75.

Cheapest I've found them is 60 per side.
Do a search...I remember a thread on here before where people were putting decent boast to the fel-pro gaskets and I think some mentioned nitrous.

 

They are $75 ea. on Ebay. Sorry I wasnt clear.
I am sure the Fel-Pro would hold. I have only heard good things about the Cometics, so thats what I was passing on.