Recently got some Diamond Pistons for an eventual motor build, the compression height is 1.250. When I spoke to Comp star, they recommended building a 355 with a 6" rod, and that 383 with a 5.850 rod would require the block to be decked .050 which they didn't recomend doing. Like to See what you guys thought, it may very well get a 355 with a custom cam and be done with it.

Chevy Small Block
Bore 4.0300
Compression Height: 1.250
Effective Volume = - 8.4CC
Valve Depth: Intake .320 Exhaust .250

Top Ring 1/16 2nd Ring 1/16
Oil Ring 3/16S Support Rail 01-9000-030

Lock Ring: Spirolox Lock Ring part # 01-5104
Off set pin: No

Wrist Pin Diameter .927 Wrist Pin Length 2.950
Piston Weight 519 Grams

 

Why did you get 350 pistons if you wanted to do a 383?

Either do a 6.0" rod 3.48" stroke motor or send those pistons back for some 1.125" comp height pistons for a 3.75 stroke motor.

 

I bought the pistons used, still new. I'll end up building the 355. Ordered the CompStar 6" rods, money saved from reusing the stock crank can go towards a tubular K member.