IIRC, the bowl ID is 1.530". I could be wrong on that, but if so, you could use an SB1687-17 J-Loy seat which has a 1 1/2" ID, a 1.687 OD, and 7/32" deep. If the ID of the bowl is different, measure it and report back, and I can find a better fitting seat for you. I don't have any of those heads here right now to measure.
__________________
Paul Carter
Carter Cryogenics
www.cartercryo.com
520-409-7236
Koerner Racing Engines
You killed it, We build it!
520-294-5758
64 GTO, under re-construction, 412 CID, also under construction.
87 S-10 Pickup, 321,000 miles
99Monte Carlo, 293,000 miles
86 Bronco, 218,000 miles
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