here is what i am working with


383 vortec efi

1997 3/4 ton silverado hd 4x4
csfi converted to to mpfi
383 vortec 4 bolt main
bassani headers 1 5/8 shorty's
dual exhaust 2 1/2 with high flow cats
64cc edlbrock e-tec's 170cc runner 1.94/1.55 they flow 20% more than the vortec's on the exhuast
9.8-1 compression forged pistons kb forged -18cc dished
6.0 H beam 4340 forged rods
3.75 stroke crank

current cam
the cam is a roller xr258hr 258/264 adv. 206/212 @ .050 .485/.493 with 1.52 112 lsa

cam i am thinking about getting

crane cam 104227 210/224 @.050 .479/518 112 lsa




http://i200.photobucket.com/albums/aa34/383silverado/P7140382.jpg

sounds like a donut machine! i like it:smokin:

thanks , what do you think about the crane cam ?

is the intake duration enough for a 383 ? or should i go with a 212 or 214.

i want as much bottom end torque as possible.

The crane cam will probably make less HP and torque than the comp cam that is in it. Comp XE and Lunati VooDoo cams have newer lobe designs that open the valves much quicker. Also the change is going to be very little. Going to a longer intake duration will make the engine lose bottom end and move the power band up.

i was told that as long as i keep the intake duration under 214 that i would have good bottom and mid range tq. my truck pulls hard up to 4500 and thats it no more power. :shaking: good want more rpm's around 5500 or so.

i was also looking into gm 12370845

http://www.superchevyperformance.com/ProductDetails.asp?ProductCode=12370845&HistoryRemove=0&historysingle=YES