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Re: Chevy/gmc 307 engine
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Posted by jdemaris on February 05, 2007 at 17:40:20 from (66.218.13.15):
In Reply to: Chevy/gmc 307 engine posted by PJBROWN on February 05, 2007 at 17:07:38:
For a Chevy enthusiest at the time - they were disappointing engines. The 307 replaced the 283. The 283 had a forged-steel crankshaft and was naturally high-revving. The 307 was basically a 283 with a 327 crankshaft in it - but cast-iron and no longer forged steel. Around the same time period - GM made several changes on all the SB engines - they led to rapid valve guide wear, poor breathing, plastic-toothed timing gears coming apart, and camshafts and lifters going bad like clockwork. Supposedly, the Parkerization hardening process was flawed. It was standard procedure in our shop to put Crane cams in the sick SBs and I never saw one of them fail.
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