Cylinder head casting numbers and valve sizes

[John A. Ross]

Cylinder head casting numbers and valve sizes

Head Number

HEAD NUMBER	COMMENT	VALVE SIZE INLET	VALVE CLEARANCE INLET	VALVE SIZE EXHAUST	VALVE CLEARANCE EXHAUST
7010031	VERY EARLY MK 1 HEAD	1.064 " ***	0.005 " +/- 0.001 "	1.010 "	0.007 " +/- 0.001 "
7010128	LATER MK 1 HEAD	1.064 " ***	0.005 " +/- 0.001 "	1.010 "	0.007 " +/- 0.001 "
7010133	EARLY MK 2 HEAD	1.202 "	0.005 " +/- 0.001 "	1.064 " ***	0.007 " +/- 0.001 "
7010171	LATER MK 2 HEAD	1.202 "	0.005 " +/- 0.001 "	1.064 " ***	0.007 " +/- 0.001 "
71981533 *	LATER " L4 " HEAD	1.202 "	0.005 " +/- 0.001 "	1.064 " ***	0.007 " +/- 0.001 "
7010107 *	EARLY SPORT HEAD	1.276 "	0.007 " +/- 0.001 "	1.064 " ***	0.014 " +/- 0.001 "
7010180 *	LATER SPORT HEAD	1.276 "	0.007 " +/- 0.001 "	1.064 " ***	0.014 " +/- 0.001 "

* NOTE : THESE ARE FITTED WITH SPORT CAMSHAFTS AND CARRIERS AND HAVE AN OIL DRAIN FITTED TO THE HEAD ( NO VALVE SEALS )

*** NOTE : ALTHOUGH VALVES SIZES ARE THE SAME THE INLET AND EXHAUST VALVES ARE NOT INTER CHANGEABLE

[John A. Ross]

Thanks OliDP72

As Oli pointed out there is also a 7010162 head which is as rare as the 107.

I am unsure of the valve sizes but I would think they will be the same as the other port heads and will update the table when I do.

J