Theoretically it should hurt the low end performance, and theoretically the heads should be port matched to it, but dyno tests have proven otherwise.Tom C said:I picked up a 429 SCJ intake at the wrecking yard for $25. The Ford performance book says you can gain some HP buy port matching stock heads and using this manifold. Is ths true? Will I lose bottem end from the huge ports? I am putting toghether a 460 with the Fuel injection pistons and D3 heads, should be close to 9-1 comp. The cam is a mild RV grind with less than 500 lift. It is going in a 77 F350 that is used for hauling and pulling my car trailer. Should I just use a stock dove intake? I need to keep the bottom and midrange torque. Thanks
An iron SCJ intake was good for close to 30 h.p. on a really mild (maybe stock) 460 without a port match (compared to stock D0VE intake). After port-match dyno numbers were identical. Conclusion was the port match was a waste of time in this perticular instance. This test was done way back before any decent after-market intakes were available for the BBF.
Some friends of mine here in TX run a mild hyd cam 460 in a 3,000# mustang with stock un-ported D0VE heads and a CJ port Stealth. Runs 10.7's consistently. Naturally asperated.
Another example of this bass-ackwards port mismatch deal. Back in the late 70's a buddy of mine had a 427 Chevelle with stock oval-port heads and a rectangle-port tunnel-ram with a single 3-barrel holley. Ran way better than one would have suspected, and had LOADS of torque. Was daily driven, ran 12's and probably weighed 4,000#
If you have the parts... Run 'em. It will work better than it "should". ;-)