Quote:
Originally Posted by TimAT
IIRC, they (GM) were only going to build 427 of the new all aluminum ZL-1's. Just the collector value alone would make it a plus. On the flip side, the GM aluminum BB's didn't appear to be all that tough- Right after they were released in '69, there were lots of valve train failure problems. Maybe they fixed the weak points in the new version.
( I'd still like to have one. Ol' Red would feel right at home!)
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During that period of time 65 thru 72 we had a lot of problems with the BB Chevy valve trains. We broke rockers and bent push rods all the time. Finally figured it out by 73. It was valve springs and rocker geometry that had to be figured correctly. Remember back then we didn't know shit about that.
