I just pulled the head off my 54 model 248 and pressure washed it before taking it apart. After washing , I was going through the manual and saw a mention of caps on top of exhaust valve stems, but didn’t see any during disassembling or clean-up. Do all 248's have these caps on exhaust valves or just some models. I usually notice things like that, but was in a hurry and could of missed it. Thanks for any information.
There was a rotator cap used on some 248 exhaust valves. (see attachment)
Intake valve springs had an "oil shield" over the top of the spring.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
Thanks for the reply Mr. Bill. That’s what my book shows too. I didn’t know if they were eliminated by the previous Owner or I lost them in my wash down ( pressure Washer). Or maybe GM eliminated them after the Book was printed.
I don't think these caps were on all engines. Seems to me like they were on larger trucks only, but my '39-54 Master Parts Book doesn't show them at all. GiantMountainKiller (Kenneth) will know.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
If you want to run exhaust valve rotators for some reason, it would probably be possible to adapt the ones that fit 305 or 350 Chevy V8s to the GMC valves. It might be necessary to use a slightly shorter free length valve spring with the rotators. Jerry
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