Re: 1964 426 Max Wedge heads
I'm not real up on the Mopar stuff but I think if those heads came off a 383 they were not original to it. According to my research the 518 head was the "new for '64 Max Wedge head", this head had 6 valve cover bolts, previously they only had 4 valve cover bolt holes. I think your freind has some pretty rare heads there.
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Tommy's Toy
1959 Pontiac Catalina 420a / 3 speed manual
1960 Pontiac Ventura 4 speed
1961 Pontiac Catalina 4 speed
1961 Pontiac Ventura 425a / 4 speed
1962 Chevrolet Corvette
1963 Pontiac Catalina 421/4 speed
1964 Pontiac Catalina 2+2 tri power/4 speed
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