old 340 stroker crank

340plot said
so, would this be usable in a 70 340 engine with stock rods and pistons? or would i have to get aftermarket pistons? and which pistons would work? im intrested if i can find some info!

70 340 would still have tall pistons, and would not work with this crank. If you used +.040 over 360 pistons (std 340 size), it would turn your high compression 340 to a stock 360 compression 367. Not really a step forward but it would have more torque. The theory behind this crank configuration is to use low compression 72-73 340 or any lo-po 273 2bbl or 318 piston that is down in the hole more than .060 to get these stock pistons up in the bore .135 higher. That is about +.060-.070 pop up above the deck. With todays range of head gaskets and the large chambers of a 360 head, this gets your compression up big time with nothing more than the crank change out and the dialing it in with head gasket thickness.

Here are some numbers from another post. You want .035-040 quench between the piston and the head and thatll give you about 10.5-1. Now that is on a closed chamber head (302) with a zero deck piston and a .040 head gasket. Now 360 and 318 heads are far from closed and that is what keeps you from creating a diesel motor with this crank. Do your math, its all here.