I'm just finishing up my 350 rebuild and can't decide what cam to use. My engine specs are as follows
350 .030 over
stock steel crank
scat 6" i-beam rods
speed pro hyper. pistons 5cc flat tops
pistons are .022" in the hole
bowtie phase 2 heads 2.05, 1.6 valves, ported, polished, valves unshrouded
This will be going in a 91 nissan pickup (sub 3000lbs???). Probably backed by a 4 speed until I can get a t-56 or TKO2. It will mostly be street driven with a few weekends at the strip. I plan on using a .021 thick head gasket which will give me a static compression ratio of 10.3:1. Here are the two cams i'm deciding on.
comp cams nx274h
275, 292 adv. duration
230, 244 @ .050
.487, .501 lift
113 lsa
comp cams xm270h
270, 286 adv. duration
226, 236 @ .050
.480, .489 lift
112 lsa
I plan on using 1.6 rockers to get my lift over .500. Both of these cams have an intake closing point of 65 and my dynamic compression comes out to be 8.2:1. It will be on a steady diet of 94 octane fuel, and sequential fuel injected. I'm looking to keep good vacuum but make good power. Some have suggested that there is too much duration on the exhaust but I thought it helped because SBC heads are weak on the exhaust side? I know I should call a cam company but would like some input before I do.
Thanks
350 .030 over
stock steel crank
scat 6" i-beam rods
speed pro hyper. pistons 5cc flat tops
pistons are .022" in the hole
bowtie phase 2 heads 2.05, 1.6 valves, ported, polished, valves unshrouded
This will be going in a 91 nissan pickup (sub 3000lbs???). Probably backed by a 4 speed until I can get a t-56 or TKO2. It will mostly be street driven with a few weekends at the strip. I plan on using a .021 thick head gasket which will give me a static compression ratio of 10.3:1. Here are the two cams i'm deciding on.
comp cams nx274h
275, 292 adv. duration
230, 244 @ .050
.487, .501 lift
113 lsa
comp cams xm270h
270, 286 adv. duration
226, 236 @ .050
.480, .489 lift
112 lsa
I plan on using 1.6 rockers to get my lift over .500. Both of these cams have an intake closing point of 65 and my dynamic compression comes out to be 8.2:1. It will be on a steady diet of 94 octane fuel, and sequential fuel injected. I'm looking to keep good vacuum but make good power. Some have suggested that there is too much duration on the exhaust but I thought it helped because SBC heads are weak on the exhaust side? I know I should call a cam company but would like some input before I do.
Thanks