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Malcolm MacKeller, pontiac engine designer was responsible for many performance improvements in the sixties. the superduty motors used his camshaft. he also created a overhead cam v-8, but was never put in production.
 

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Yes; that engine was installed in Mac's 63 black Grand Prix.
It was a DOHC 421. Very cool looking!
I have seen it many times at local and National shows.

I don't know what has happened to the car since he passed away.
 
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