Sal, it's just a stock L31 Vortec roller cam, what came in 350 trucks '96-'99 ish. I know it may be a little small for a 383, but I'm using 1.6 ratio rocker arms to give it a bit more lift and I'm not looking for a top end screamer (it's going in a 3/4 ton 4x4 truck) just wanted a torquey low-end. We'll give it a shot and if I hate it I can always swap later, probably to a LT-4 roller. I had some limitations that pushed me into this cam: 1) vortecs require some mods if much more than .450 lift, 2) keeping OEM TBI fuel injection (with custom chip, bigger TB and 454 injectors) - this system is pretty unforgiving with too big of a cam or too much overlap 3) Needed to be a roller cam that would work with post-'87 style block (they had provisions for roller cams built in). 4) It's what I had!
Cam specs: 191/196 duration at 0.50", .44"/.46" lift with 1.6 rockers, 111 LSA.
Engine Specs: 1990 block, 4-bolt main, one-piece RMS, OEM roller cam provisions. 4.03 bore/3.75 stroke, Vortec heads, 9.5:1 CR with KB 135 pistons. Eagle cast crank, stock rods.
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1976 Silver/Firethorn. L48, 4spd. Original 2 bolt, vortec heads, 9.4:1 CR, Speed Pro Cam: 224/224@0.050, 112 LSA, Eagle Steel Crank.