So I have a 68 camaro 409 sbc w/ M21 Four speed, hooker side pipe headers w/ high flow inserts.


400 sbc bored 40 W/ splayed main caps
scat crank
h-beam 6" rods
SRP flat top piston
rev kit
comp roller lifters vertical looking bar
comp 1.5 roller rockers
AFR 210 comp heads
super victor manifold
Quick fuel p-950 carb
501C2LUN Solid roller cam Deg *7 adv
6al Msd


So I went to the chassis dyno the other day and made three dyno pulls changing full advance each time.

1) 403 RWHP at 5300 and 424 RWTQ @ 35* full timing by 2800
2) 399 RWHP at 5300 and 428 RWTQ @ 31* full timing by 2800
3) 405 RWHP at 5300 and 434 RWTQ @ 36* full timing by 2800

The Air fuel ratio is between 12 and 13 threw the pulls. I also have a 1 inch spacer and 1/2 NOS plate. (The bottle is not in the car but its set for it). Compression is 11.4- 1 i run 92 octange.


The cam the heads and the intake are all suppose to make power between 3500 - 7500 so why is my max power 5200-5400 and it falls off prety good by 7000. So what im asking I guess ….. what is it that moves the peak HP up the rpm scale?