A really hot set-up is to use an Olds block & pistons with a set of
Buick heads from a 4bbl engine. Olds had 2 types of heads to vary the
compression for 2 & 4 bbl engines. Buick used the same heads, but
changed pistons. Olds used the same pistons on all engines.
The combination yields approx 10.75: 1 compression, & the Buick heads
sit more upright, making for better spark plug & headder bolt access. I
ran such an engine 170,000 miles on 93 octane Amoco with no problems
untill I broke a rocker shaft @ 7000 rpm drag racing a 6-speed Camero.
Stayed with him 'till I broke. I think the very heavy valve springs were
a contributing factor.
Don't do that any more.
Jim Stuart
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