On top of all this, he bought some 452 heads fromm Indy Cly Heads years ago. They were milled flat, had bigger valves installed and had hardened exhaust seats installed. No telling what he paid for them many years ago. I pulled them apart to find bigger valves but not opened up to even benefit from them. They have cheap guides and stock seals and the seat were cut by a caveman with a square stone. They were obviously cut with an old stone valve bringing machine and I think they dressed the sones at a different angle that the valves. The seat was so narrow, it was barely sealing. Worst valve job I ever saw.
I had someone send me a set of those to go thru a few years ago.
The way the bowl cut was done, they actually flowed worse than a stock head with a stock valve and a very basic valve job.
They really “need” to have someone do a quick bowl blend before you put them back on.
Edit: found the notes on those.
Aerohead 452’s, 2.14/1.81, no blending, big bowl cut:
4.375 bore, 28” test pressure:
Lift——- In/Ex
.100—- 67/53
.200—-116/95
.300—-168/127
.400—-196/139
.500—-217/143
.600—-222/143
Might be the worst I’ve ever tested with big valves.
