O-Rings – Cu Gaskets

If you purchased one of the first Keith Black Aluminum Blocks, you would have received these instructions to modify your steel heads with a receiving grove for the o-rings in the new block.

when aluminum heads became available the O-ring was installed in the softer alum head and the sleeve grove was widened to become the receiving groove.

Hoops	Height	Width	Dimension exposed	A x B
Standard	.098	.050	.021 to .031	.050 x .070
Tall	.100, .105, .110		.021 to .031	.050 x .070
Wide		.058, .060	.021 to .031	.050 x .070
O-Rings (SS-Wire)	D	C with receiving groove	C without	A x B *
.041	.038 to .040	.030	.030	.030 x.060 *
.052	.049 to .051	.041	.039	.040 x.090 *
.062	.059 to .061	.051	.046

Note * — Old — KB, BAE, TFX sleaves are cut to .020 x.070 wide (SCE gasket recommends more)
Note: sleeve should sit .007 above aluminum block ( Dry Blocks or older blocks without using water)
Note: hoops are generally used with .070-.120 gaskets, o-rings are used with .035 .050 gaskets-
( I have used o-rings for a whole season without the actual Cu gaskets)

A Original dowel pin

B Extra head stud with locating dowel pin

C New location dowel pin