You say they are identical builds... What are the combinations? Normally the intake center line will move power up or down, but not change the peak numbers. Doi you have incrementals on a "fast" one and this one? Have you done a leakdown on it?
i did do a leakdown test. they were all about 7-10%. the motor specs on the other 500" and this one are:
500"
295 cnc sr heads
same cam solid roller 272/[email protected] .661/.661
1.6 t&d,s one has 1.7 t&d,s
indy 440-2d dualplane
13.1 cr
this one has never performed like it should. or even close to the others. i have not had this one on the dyno. the others did well on the dyno. 716hp 656 tq for the one with 1.7,s. the other one was chassis dynoed. it did 573 rwhp. i would say this one is down about 50-100 hp.