4a heads on 455
#2
None whatsoever. Small ports, small valves, and crappy "lightweighted" castings. Port mismatch causes a flow disruption on the intake side. 4A heads are crappy on their original 403 and only get worse on a BBO. I use a set as ballast for my swap meet canopy.
#4
I also used a pair, along with cracked factory Dodge Magnum heads to counter weight my engine hoist, when I extended the boom. The 4A exhaust ports are horrible with tiny 1.5" valves. My set CCd at 86, so no help at all in the compression department either. How does the motor perform?
#5
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