Well my neighbor went back up to the dyno today to finish up the tune. Numbers still seem low to me though. 203 hp and 310 torque. AF ratio is dead on from idle to 5800. We ended up kicking up the pressure on the holley tbi, the max we could get was 16 psi, which was enough to get the tune down but holley said we could go up to 21. Just to recount the buildup, its a 355 with crane cam 212/218, GM performance tbi intake, gibson headers with true duals, holley 670 throttle body, K&N filter with the aftermarket air tube feeding the filter housing. The truck is a 92 with a 5 speed. Any suggestions on why the numbers might be so low or improvements to be made. The only thing I could think of was valve float or timing retard, but Im sure Jeff would have noticed the timing on the dyno while he was tuning.
Thanks

 

sorry wrong board, but please chime in if you have any suggestions