1995 K1500 L31 Vortec long block install

[Fast355]

I just checked. Pistons are GM PN 10172839, standard bore.

What are your guys thoughts on cam selection for this motor with TBI heads going in a 5200 lb truck? I've been thinking about getting the zz4 intake lobe ground on the factory roller cam. This would be a single pattern hydraulic roller with 264 @ 0.006", 208 @ 0.050" 0.474" lift on a 111 separation.

I have had a pair of 810 casting 350 TBI swirl port heads on a flat top piston .040" over 305 and ran a Crane 100052 cam 272/272 @ .004, 216/216 @ .050, .484/.484 w 1.6:1 rocker, 110* LSA, 106* ICL. Edelbrock performer RPM, Q-Jet and headers. Had a 2,500 rpm stalled TH350 and 2.73s in a 1980 C10 longbed pickup. Plenty of torque everywhere with the setup.

That being said I would have a hard time not using the factory LT4 exhaust lobes. 277 @ 0.006, 210 @ 0.050, .449" lift w/ 1.5:1 on that 111* LSA running the factory 106.5* ICL.

[dave w]

I just checked. Pistons are GM PN 10172839, standard bore.

What are your guys thoughts on cam selection for this motor with TBI heads going in a 5200 lb truck? I've been thinking about getting the zz4 intake lobe ground on the factory roller cam. This would be a single pattern hydraulic roller with 264 @ 0.006", 208 @ 0.050" 0.474" lift on a 111 separation.

Based 100% on my personal experience, (1993 K1500 5.7 liter / 4L60E 5200 Lbs pickup) I would recommend the GM HT 383 roller camshaft 14097395 http://paceperformance.com/i-6255412...amjet-350.html I'm using 1.6 roller tip rocker arms with stock TBI heads. I had a local cam grinding company "Clone" an HT383 camshaft for me, HUGE $$ savings! With my own custom chip, I can accelerate from 0 MPH - 60 MPH in about 7 seconds. The towing torque of the HT383 is awesome on the nearby 6% grades I travel / tow over!

dave w

[Fast355]

Based 100% on my personal experience, (1993 K1500 5.7 liter / 4L60E 5200 Lbs pickup) I would recommend the GM HT 383 roller camshaft 14097395 http://paceperformance.com/i-6255412...amjet-350.html I'm using 1.6 roller tip rocker arms with stock TBI heads. I had a local cam grinding company "Clone" an HT383 camshaft for me, HUGE $$ savings! With my own custom chip, I can accelerate from 0 MPH - 60 MPH in about 7 seconds. The towing torque of the HT383 is awesome on the nearby 6% grades I travel / tow over!

dave w

That might work well Dave, but I have found in my experience that the TBI swirl ports love a single pattern cam. The I/E flow ratio of the heads is such that they do not benifit from dual pattern cams when used with a better than stock exhaust system.