On a 302 with iron GT 40 heads, when going from a manifold with rear water crossover (Edelbrock Performer) to one without (Weiand 7515), does there need to be any modification done to the heads or gasket?
Thanks for the tip on sealing up that water passage real well. There isn't alot of material around the ports for sure. It may be a little much for my engine but I will swap for a Performer RPM if it isn't driveable. Saw an old dyno comparison and it made surprising power down low so I thought I would try it. Thanks again.
Got that manifold on (finally) and it seems to be sealed OK. No leaks so far. I wonder if I need to jet it richer going from a dual plane. It seems to run OK, especially at higher revs, as expected, but is a dog off the line. It may be too much for my mild engine. It idles way better for some reason. Any tuning suggestions?