[SD455DJ]

We were able to make 10 pulls starting at 10 am and finished by 11:30 am. The 1st pull to establish a baseline was 410 hp @ 4800 rpm/515 lbft @ 3600 rpm...20 hp and 3 lbft torque better than with the small valve high compression #15 heads with log manifolds. We started with 38 degrees total advance and BU (0.0547 short tip) secondary rods in the 7041263 Q-jet. The factory HO exhaust manifolds (with the puny 2.1" outlets) with Pypes 2.5" mandrel downpipes tied into 10' of straight 2.5" pipe, so 14'-15' of exhaust pipe.

We richened the secondary's twice ending up with CC's (0.0300" medium tip) and improved to 420 hp @ 5000 rpm/32 lbft @ 3600 rpm. We them bumped the timing to 41 degrees, replaced the small long pipes with the dyno room 8" dumps for the downpipes to flow into, and added the air cleaner base and got the best hp & tq for the session at 431 hp @ 5000 rpm/539 lbft @ 3600 rpm.

We are certain if we had used RARE 2.5" outlet repro manifolds we could have added 3-5 to the hp/tq numbers across the pull range (3000 - 5500 rpm). HP peaked at 5000 rpm typically and held on to 5400. Overall, we were very satisfied with the 2802 Summit cam and it worked very well with our 8.6 static compression ratio. The weather conditions put the DA at over 2000 feet (69 degrees/29.00 barometric pressure/71% relative humidity).

Dennis & Dan