headgasket info needed

[delong_1]

I have a feeling this is a stupid question but i just want to be sure.

my new block is bored 40 over and i already have standard bore grade C gaskets, i was doing a little measuring and the gaskets i have should not hang over into the cylinder but i am just not sure if it will work out using these gaskets.

Thanks for the help

 

[bullfrogjohnson]

I have a feeling this is a stupid question but i just want to be sure.

my new block is bored 40 over and i already have standard bore grade C gaskets, i was doing a little measuring and the gaskets i have should not hang over into the cylinder but i am just not sure if it will work out using these gaskets.

Thanks for the help

I am pretty sure the standard gaskets are good to a 40 over block if not a little more.

 

[delong_1]

i was planning on getting everything put back together this weekend, if i need to get different gaskets i will need to order them tomorrow so hopefully they will get here in time.

 

[delong_1]

I am pretty sure the standard gaskets are good to a 40 over block if not a little more.

awesome. thanks for the reassurance.

 

[bullfrogjohnson]

I was wrong with what I posted. I just did some searching and it looks like the gaskets you need are:

Block Over-Bored .030" and Deck Milled .008" - The thickest OEM Dmax gasket, .010" thicker than a C.

97358466 Left
97358465 Right

I dont know if these will fit a .40 bore but there are 5 different gaskets from gm. A,B,C, Overbore, Overbore + Deck Milled

 

[delong_1]

hmm, guess i better call the dealership in the morning.

 

[JoshH]

I know for sure the stock bore gaskets will work with a block that is bored .020 over, but I'm not sure about a .040 overbore.

 

[delong_1]

i wonder if i can make them work.

 

[JoshH]

Best bet is to lay the gasket on the block and see if the gasket hangs over the bore. If it doesn't, you should be fine.

 

[delong_1]

after all of this, and not sure when the correct gaskets will arrive at the dealer my though is: are the cali heads really that bad compared to the federal heads that i was going to use.

the motor i bought has cali heads already on it and i have a set of federal heads, just wondering if there is enough of a difference to go to all this trouble????