NEED CAM ADVISE

[grumpyvette]

Hi guys I have a sbc 400 in a 68 camaro and just did a rebuild on it with the help of my mechanic buddy.I have new Profiler AllAmerican 195 runner heads on it along with a compcam xe274 cam.The problem is I dont have the seat of your pants off idle torque anymore?It has 9to1 comp.4valve relief KB pistons,Scat crank,MSD streetfire hei,Speed demon 650 carb on an RPM intake.Its hooked up to a th350 with shiftkit and 2500 stall.Posi in back with 308 gears.Am thinking about changing the cam out and going to a 3:42 gear to help bring back the lost bottom end?Any suggestions would be really appreciated!

http://www.wallaceracing.com/dynamic-cr.php
http://www.compcams.com/Company/CC/cam- ... id=87&sb=2

your dynamic compression with that current 274 comp cam is in the 7.3:1 range,as the intake valve closes at about 64 degrees , thats far to low of dynamic compression,to have a instantly responsive engine, with that 3.08 rear gear ratio, youll want to find a cam that moves your dynamic compression up close to 8.1:1


a crane 114142 with some 1.6:1 ratio rockers installed at split overlap will put you right where you want to be (thats installed a couple degrees retarded from the typical dot-to-dot, instal, at .050 timing its intake valve closes at 35 degrees, which is about 50 degrees of seat timing putting you close to the 8;1 dynamic compression ratio your looking for

http://www.jegs.com/i/Crane-Cams/271/114142/10002/-1

http://www.summitracing.com/parts/clo-9-1100/overview/

a cloyes timing set has a R crank index slot that drops right in to correctly index the cam, if you use the R index on the crank gear to the cam (0) instructions in the box

viewtopic.php?f=52&t=4548&p=12128&hilit=cloyes#p12128