I have a 88 gta 305 5 speed.


Im doing a cam and im thinking about putting in felpro 1094 thin headgaskets to increase my comp
on summit site it shos 305 my year


I just want to make sure that they work


has anyone used them on a 305 88 tpi

 

There are a couple of potential problems with the 1094s in your 305.

First, they are not composite gaskets, and probably won't be as reliable for a street application if the head and deck surface finishes are not very clean. Some of that can be addressed by stoning the surfaces flat and cleaning up afterward if these are older castings with coarse factory finishes.

Second, they 1094s have a 4.1" bore opening for a 350. Some of the compression gain from the thinner gasket would be lost in part to the larger gasket bore in a 305 (3.76" bore). Similarly, the sealing ring position will have to be checked on the heads and block to verify there is adequate margin of safety.

Third, if the block has been decked the quench are may be too tight with the 1094 gasket. The current deck height will have to be measured to calculate the quench area.

Fourth, the piston/valve clearance will need to be checked, especially since a new (different) cam is being installed. If the pistons have reliefs that needs to be measured as part of the calculations.

 

ok ty