The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 400 sbc heads and steamholes? add them or?

Eddie H. · 03-25-2018, 06:19 PM

I've been running a small block 400 in my 69 GMC for more than 20 years now with no issues whatsoever. I Built it mildly as a low rpm, high torque engine with a .020 overbore and a mild Crane 260H cam. I just used the stock 400 heads with a little port clean up. In my opinion, it is a great little truck engine, and should have been put in these trucks from the factory. I've never had it on a dyno, so really I have no idea as to actual HP and torque numbers, but from the seat of my pants, it feels much stronger than any 350 powered truck I've ever owned.

03-25-2018, 06:19 PM	#21
Eddie H. Registered User Join Date: Mar 2001 Location: Paradise TX USA Posts: 1,200	Re: 400 sbc heads and steamholes? add them or? I've been running a small block 400 in my 69 GMC for more than 20 years now with no issues whatsoever. I Built it mildly as a low rpm, high torque engine with a .020 overbore and a mild Crane 260H cam. I just used the stock 400 heads with a little port clean up. In my opinion, it is a great little truck engine, and should have been put in these trucks from the factory. I've never had it on a dyno, so really I have no idea as to actual HP and torque numbers, but from the seat of my pants, it feels much stronger than any 350 powered truck I've ever owned. __________________ "Negative people always seem to have a problem for every solution"