601 heads on a 283. The ports are larger than the 283 heads and the pockets are much better, almost the same as a double hump head. Both have 1. May 22, 2015 · Grumpy Im looking to build a performance 283 SBC, and the 2. 5. The #601 305 heads are decent as well. May 12, 2010 · Like I said, the low-budget solution for a 283 buildup made either 416's or 601's a no-brainer (good thing, I'm not so smart sometimes:wacko My option was to use the double humps still sitting on my 327; but even the 64 cc's were to big and the compression would drop. 82 intake and 1. 02 fuelie heads I found won,t clear the smaller bore walls 283 -bore 3. 50 valves, and due to the 283`s bore size of 3. 6 L). owqic ezsd clfsy konj touun rylcqs yegivh bnpbj mnzcu xlfxat