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**jocko** · 11-15-2017, 02:51 PM

[QUOTE=truckster;8082963]Jocko, the HT 383 has a hydraulic roller cam: http://www.chevrolet.com/performance...l-block-ht-383

Thanks - that’s certainly what i was expecting, was surprised that Scoggin Dickey listed it as a flat tappet. Ok, scratch that detractor! Good point on 383 cam in the L31. Has anyone does this that can confirm you won’t kiss a piston in the slightly higher compression L31 with the slightly higher lift of the HT383 cam? I highly doubt it, the lift isn’t “that” aggressive, but would be a comforting data point. I’d probably go with the 383’s intake also. Considering GM Parts prices - by the time you add a flexplate, manifold, electric go, and cam, you might be tickling just south of the 383’s price tag, and you could use a mech pump with the 383

. Still, sure don’t need a forged crank for an old truck, so there are some savings to be had with any L31 approach.

11-15-2017, 02:51 PM	#35
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,936	Re: What GM create engine to buy for 3/4 ton 72 C20 [QUOTE=truckster;8082963]Jocko, the HT 383 has a hydraulic roller cam: http://www.chevrolet.com/performance...l-block-ht-383 Thanks - that’s certainly what i was expecting, was surprised that Scoggin Dickey listed it as a flat tappet. Ok, scratch that detractor! Good point on 383 cam in the L31. Has anyone does this that can confirm you won’t kiss a piston in the slightly higher compression L31 with the slightly higher lift of the HT383 cam? I highly doubt it, the lift isn’t “that” aggressive, but would be a comforting data point. I’d probably go with the 383’s intake also. Considering GM Parts prices - by the time you add a flexplate, manifold, electric go, and cam, you might be tickling just south of the 383’s price tag, and you could use a mech pump with the 383 . Still, sure don’t need a forged crank for an old truck, so there are some savings to be had with any L31 approach. Last edited by jocko; 11-15-2017 at 03:28 PM.