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Just out of interest what heads are you running Diplomat?



I went with a set of 596 castings, I had the machine shop go over them. New Manley severe duty valves, 2.02/1.60, 11/32 stem, new bronze guides, and a standard 3 angle valve job. I ported them using the MP porting templates, here are the flow numbers (flowed on SF-600 @ 28" water):

LIFT I E

0.100 67 57
0.150 99 79
0.200 130 104
0.250 162 125
0.300 189 140
0.350 215 152
0.400 235 160
0.450 253 167
0.500 262 172
0.550 261 175
0.600 248 177

Nothing crazy, but good enough for a DIY job...LOL...I had fun, satisfaction and new-found appreciation for those guys who do this type of work for a living.



Intake manifold is killing the mid range that you are pulling through. Only way to cure that is to have a converter that flashes to 4500ish for overcoming the Strip Dom weaknesses.

I have a couple strip doms hanging on the wall for a reason... Fuel delivery could be an issue for lack of MPH.

A comparative from a slightly stronger, solid cammed combination. With a smaller cam, I'd expect the lower rpm delta to be the same or even worse.

http://www.hotrod.com/how-to/engine/mopp-0108-dyno-testing-small-block-intakes/