custm2500

iTrader: (11)

I am wanting to confirm this is the correct head gasket for my 408.
http://www.ebay.com/itm/GM-Performan...546098&vxp=mtr

I see some people talking about the gaskets being for a 4.030 bore and others not. Wasn't sure if all the gaskets were good for the larger bore.

redbird555

iTrader: (14)

nope you need the bigger gaskets the piston will always come out of the top of the block just a hair and therefore the gasket must match the block that kit is for a 3.89 bore on an ls1 you need the custom size for a 408 give scoggin dickey or tsp a call and they should be able to set you up

custm2500

iTrader: (11)

I was looking on summit's web site and they have some gaskets for 4.000 and 4.190. Would .030 too small be a problem? Would .070 be a problem? What way do I need to go. Thanks.

Obviously Texas Speed has 4.035 gaskets but I was hoping one of the two from summit will work because I get stuff from them in one day. Thanks.

wildcamaro

iTrader: (15)

If I were I would just get the tsp gaskets...if you spend the $ for a 408 chances are you should get the tsp...I live in pa and was suprised how fast they shipped (like 3 days for a head/cam kit)

custm2500

iTrader: (11)

Summit does have a 4.030 gaskets. I didn't find them when I first posted this but since have. Only down side is they are $100 per gasket vs. $35 for both. Big differance.

wildcamaro

iTrader: (15)

Oh yea but like I say in the car world you usually get what you pay for...make sure they are mls

custm2500

iTrader: (11)

Does anyone have input? Will the 4.000 cause a problem? I can save a good deal of money and still get a gasket that everyone says is great. Thanks.

mark21742

You don't want a thin peice of gasket sticking out into the bore area at all. All that does is ask for trouble