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Author Topic:   3986339X Heads any Good?
Dirt Maniac

Total posts: 108
posted December 14, 2005 04:47 AM  
Are the 339X heads anything good or special compared to the tried and true standards of stuff like 487's, 882's, and 993's? The casting number says they are 1971, 74cc, 307/350 heads. Thanks, Jim

Dirt Maniac

Total posts: 198
posted December 14, 2005 10:32 AM  
What size are the valves?

Some 307s had smaller valves than the normal 1.94s used in most 350 heads...

Dirt Forum Champ
Total posts: 5492
posted December 14, 2005 08:23 PM  
if i rember right they have the realy small valves like 1.72 or something like that on the intake

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