Posted by MoparNorm on Sunday, March 09, 2008 at 11:47:44 :
In Reply to: '55 Dodge 331 hemi/5speed? posted by steve k calif on Saturday, March 08, 2008 at 23:31:24 :
Look for parts on the web before you decide.
331 parts may be rare and expensive.
318 Poly parts, while not cheap, are still available from several sources, including headers....= )
My guess is that the Poly can produce better HP and fuel economy numbers, the 331 has the "cool" factor, but may not match up with the 318A Poly.