Re: 265-283-302-305-307 engines

Posted by jdemaris on February 06, 2007 at 06:35:46 from (66.218.11.69):

In Reply to: Re: Chevy/gmc 307 engine posted by Reply on February 05, 2007 at 18:41:57:

In regard to the oil burning from valve-guide wear, plastic coming apart on the timing gear, camshaft and lifters wearing out, etc. - it was not a problem specific to the 307. It was a general problem GM had at that time period with ALL their small-blocks. I had a new 70 Nova with a 307 and it never had a problem - same goes with my 68 Chevy PU with a 307. But . . . many did have problems. In comparison - I never saw a single Ford or Chrysler with a worn-out camshaft during that time-period.
In 1968, the 283 was replaced by the 307 and it was cheapened quite a bit. The 283 block was supposedly high nickel content and the crankshaft was forged steel. None of that was carried over to the 307.
Our #1 repair in the shop early 70s was timing set, valve guides and seals, camshaft and lifters - for small blocks - mostly 307s and 350s.
With many, the plastic tooth-coating on the camshaft timing gear would fall apart, and bits of plastic would plug the oil pump screen.
In 68 - the 307 came out and was basically a cheapened 283 with a 327 crankshaft and stroke. It was a low-performance, 2 barrel carb only engine.
1967-69 - for Z28 Camaros only - a special 302 was offered - it used the first small-block bore from the first small-block 1955 265 V-8 along with a 327 crankshaft and stroke. It was a high-performace engine only. I drove one brand new in 69 and it was the most amazing car I've driven in my life.
In 1976 305 came out and was made in low and high perforance versions. It too used the original 1955 vintage bore from the 265 engine - but with the crankshaft and stroke from a 350. More like a tractor engine, I guess with a long stroke as compared to the bore.

Replies:

• Re: 265-283-302-305-307 engines supergrumpy 08:24:10 02/06/07 (0)

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