Does anyone have any recomendations on If i should with with a LT4 felt pro, or an Impala felt pro, head gasket on LT1 heads I just had them milled 10000ths over. I heard I would get around a 11:1 compression with the LT4 gasket and 11.3:1 compression with the Impala head gasket. Does anyone have any recommendations on what I should go with?

 

Using a thicker head gasket will lower compression. I don't see why you would use anything other than a stock head gasket, since you're pretty much stock.

Milling them .001" is hardly noticeable. It's .020" or more removed off the deck face where you begin to need corrective material removed from the intake port deck and intake-to-block rails.

 

I guess im just looking for that little bit of unf, and extra horse power, every couple of horses count.

 

The main reason why I recommended a thinner headgasket is to get the quench to where it really should be. This is the space between the piston and the flat part of your heads. If this is closer together it will make a better air/fuel mixture and a better combustion.