SBM 3.79" crank

Has anyone done a SBM with a 3.79 crank and 6.50" rods? If so how did you like it?

That should work okay. We rarely see a SBM engine in the shop anymore. Last one was a 427 with a 4.125 stroke and Chevy 6.200 long rods. It ran great, car went 160 mph.

You have 6.5" rods lying around, or are you getting them made for the engine?

I bought a 360 years ago when I knew much less, it had 6.625" long rods in it. It's not an endeavour I've sought to replicate.

Didn't they make the 3.79 so you could use a 360 standard OEM piston and get high compression For a .060 over 360?

Or a .020 over 340 I suppose would work too.

If an OEM 8:1 360 is about .0100 in the hole the math works out to very close to zero deck using the OEM rod.

Or maybe they made it to run a SBC CH piston in the 9.2 deck R block? I'm sure there's a combo that works using an off the shelf slug.

I built a 440" W2 360 (4.25" CRANK) and used an off the shelf SBC chevy 'claimer' Race piston @ ~1.28" CH and the slug was super light, I think my bobweight was right around 1800

Molnar has them in stock.

You've got nothing to lose really. The rods are about 35 grams heavier than a 6.125" rod. With the right piston, you should be able to get something around the 450 grams mark. Put a decent wall thickness wrist pin and modern ring package in it and you'd be good to go.

I’ve ran a 4340 LA Enterprise 3.790 crank for many years. It was a MP part#, from the early 1990’s. It was the basis of the 388” R1, 59* 4 bolt block project. Oliver 6.50” rods, Milodon swinging pickup pan. Roller valve train, with Norris rockers. Brodix heads. I’ll probably enter the mortuary before it fails. 🤣 “Dead” reliable.