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aspen7709 · 08-14-2009, 10:48 AM

Be careful!!!!!! the 308's run large in the port cc and even straight out of the junk yard they can fail!! 576's were never put on production automobiles they are a mopar perf casting #p4529269 and are NS1. Plus I would do like a few other notable racers and use a less popular casting like a 051 because the 308 and the 596 is what nhra brings to compare to what you have. plus you also have to compensate for the rocker shaft height because the 308 is a roller lifter head you lose .040 lift at valve on your cam!

08-14-2009, 10:48 AM	#3
aspen7709 Member Join Date: Aug 2004 Location: sunny,az Posts: 165 Likes: 0 Liked 0 Times in 0 Posts	Re: small block mopar heads wanted Be careful!!!!!! the 308's run large in the port cc and even straight out of the junk yard they can fail!! 576's were never put on production automobiles they are a mopar perf casting #p4529269 and are NS1. Plus I would do like a few other notable racers and use a less popular casting like a 051 because the 308 and the 596 is what nhra brings to compare to what you have. plus you also have to compensate for the rocker shaft height because the 308 is a roller lifter head you lose .040 lift at valve on your cam!