Thread: '68 Yenko, Transplant vs. COPO
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Old 04-25-2001, 10:58 PM
Chevy454 Chevy454 is offline
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Default Re: '68 Yenko, Transplant vs. COPO
When did GM start using the double pumper? Was it in '69 only? Weren't there availablity problems when the ZL-1s came out? Wasn't it Charley's ZL-1 that started out with a vacuum secondary because Holley hadn't delivered the 850s yet?

When did Holley start making the double pumper?
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