TPIFormula

Im building a 350 for my S10, the 305 turned out to be no good so I picked up a late 70's-80's 010 4 bolt main block, flattops w/ 4 valve relief, 305 TPI Heads 58cc assuming with flattops around 10ti1 CR? Well anyways, I am tossed up between a few cams! need some help!

This motor will be a TBI motor using a edlebrock EPS manifold w/ TBI Adapter, Headman Headers, and custom chip Converter stall speed is 2K RPM

The cam choices are as followed,

1. COMP Cams CL12-268-4 Xtreme Energy 268H
Basic Operating RPM Range: 1,800-5,800
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 224 int./230 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 280
Advertised Duration: 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.479 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.480 in.
Valve Lift with Factory Rocker Arm Ratio: 0.479 int./0.480 exh. lift
Lobe Separation (degrees): 114



2. COMP Cams CL12-262-4 Extreme Energy 262H
Basic Operating RPM Range: 1,500-5,500
Intake Duration at 050 inch Lift: 218
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 218 int./224 exh.
Advertised Intake Duration: 262
Advertised Exhaust Duration: 270
Advertised Duration: 262 int./270 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.464 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.470 in.
Valve Lift with Factory Rocker Arm Ratio: 0.464 int./0.470 exh. lift
Lobe Separation (degrees): 114


3. Crane Cams 114142 Compucam
Basic Operating RPM Range: 1,800-5,600
Intake Duration at 050 inch Lift: 216
Exhaust Duration at 050 inch Lift: 228
Duration at 050 inch Lift: 216 int./228 exh.
Advertised Intake Duration: 272
Advertised Exhaust Duration: 284
Advertised Duration: 272 int./284 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.454 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.480 in.
Valve Lift with Factory Rocker Arm Ratio: 0.454 int./0.480 exh. lift
Lobe Separation (degrees): 112


Not planning on turning High RPMS at all. truck has 3.42 gearing.

All help appreciated

Travis

TPIFormula

changed cyl head choice

TPIFormula

Wow I thought Id get an opinion by now! lol Please guys help me out

Atilla the Fun

With 58cc heads, flat top pistons, and proper piston-to-head clearance around 0.040", you're closer to 11:1. I wouldn't try that.
in an S-10, you don't need a lot of off-idle torque. You also need to reduce your front end weight.
Please consider a pair of new, aluminum Patriot heads for $800/pr assembled, from www.competitionproducts.com
These heads will give youa solid 50-plus horses over 305 heads, will get your compression to where you can run pump gas, will save you 50 pounds off the nose of this nose-heavy project, and will give you an extra 1000 useable rpm for any given cam, over the 305 heads.
Then, unless you're custom ordering those comp cams, they come with a 110 lobe sep and a 106 intake centerline. They offer them with 112 LSA under different part numbers than the 110 grinds.
For TBI, even with a custom PROM chip, I'd say 224/230-114 with the Patriot heads. After cam run-in, then switch to 1.6:1 roller rockers.