kgkern01

iTrader: (10)

As the topic states, which head gaskets are best for a 4.030" bore? Running around 13.4 cr and E85.

Atomic

iTrader: (37)

You dont want the gasket to be smaller than the bore, so 4.040"

Blackbirdws6

iTrader: (7)

4.040

kgkern01

iTrader: (10)

Well neither is smaller than the bore, one is .010" larger and the other is .070" larger. I want to know if the 4.040" would be too close to the bore size?

Ed Wright

iTrader: (1)

Depends on how well your bores, the head gaskets, and your dowel pin locations. Unless your block is CNC machined (not many are) you would be safer with 4.1" gaskets. That is what most everybody uses. Your talking .005" radial clearance with the 4.040" gaskets.

taner

iTrader: (6)

yaaa what he said!

Atomic

iTrader: (37)

For some reason I read that as 4.040 or 4.010

so yea, go for the 4.1s

quik95lt1

iTrader: (7)

what ed said x2

on a run of the mill combo id want at least .030 so .015 radial on each side......I run a 4.075 on a 4.0465 bore on mine, its as tight as I felt comfortable going with a stock block and stock dowel pins my $hits nothing special in that area

kgkern01

iTrader: (10)

The block had to be taken .040" over, and square decking ended up at .002" deck. Would a .042" quench be too loose or should I pay for custom Cometics at .035" to get it to a .037 quench?

cardo0

Thats right were it should be. Though .037" is better u won't have to compromise with a thinner and more costly head gasket and will still have great quench.
0.042" will get u good quench and use a good head gasket too.
I wish my car had 0.042" quench.

Hope this helps,
cardo