bthomas

iTrader: (1)

I recall reading before a measurement point on 243 heads that gave a pretty close idea to determine how much they had been milled.

Can’t seem to find anything about it now though.

RonSSNova

iTrader: (3)

I believe the correct measurement is from the valve cover rail to the head gasket surface.
Another place would be the head bolt boss.

I get 1.619” at the head bolt boss.
And 4.752-4.753 at the valve cover surface.
Measured on untouched 799 heads I have here.

Ron

Rick Dorion

iTrader: (1)

Is there similar info on other heads? Specifically, I'm interested in 862's.

RonSSNova

iTrader: (3)

Since all heads are interchangeable, I would assume the 862 is the same measurement.

Kawboom

This is good info, but I have a set of 243 heads that have been machined, I don't know how much but certainly not factory, and they measure 1.620". This measurement may not be consistent to the thousandth.

Rick Dorion

iTrader: (1)

Just to add to the data, I measured 4.752 on my stock 862 heads.