Can one tell 1.94 vs 2.02 '462' heads from outside

[Gary B.]

Does anyone know how to tell the difference between 3890462 heads with 1.94" and 2.02" intake valves by looking at the casting numbers or for that matter by looking at anything on the outside or on the valve spring side of the heads? If not, how did GM keep track of them in inventory? Some paint broadcast marking?

Thanks,

Gary

[Terry M.]

Re: Can one tell 1.94 vs 2.02 '462' heads from out *TL*

Both Flint and Tonawanda used paint markings on the end of the heads 20 years ago.

[Gary B.]

1.94 vs 2.02 '462' heads

Terry,

And these paint markings were eventually covered up by the chevy orange, I presume.

Thanks,

Gary

[Joe C.]

Re: Can one tell 1.94 vs 2.02 '462' heads from out

Gary:

As far as I know, there is no way to tell. They both used the same "double hump" casting, but the 2.02" heads went through a machining process which enlarged the valve seats, and unshrouded the exhaust (but not the intake) valve.

Joe

[Terry M.]

Yes, Gary *NM* *TL*

[John H.]

Re: Can one tell 1.94 vs 2.02 '462' heads from out

Joe -

The unshrouding machining was adjacent to the intake valve, not the exhaust valve (used a 1.34" dia. cutter head piloted in the valve guide).

[Joe C.]

Re: Can one tell 1.94 vs 2.02 '462' heads from out

John:

I stand corrected--I knew it was one of those. Seriously, you jogged my memory, which isn't too good at times. I unshrouded the exhausts, among other things, when I tricked up my heads.

Joe