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Have the shop correct the deck height. They will then be able to give you a number to use while you shop. There has been a lot of discussion on here over the years about the lack of 383 piston selection. A few hundred more for a cusomt piston might be well spent as you can get exactly what you want accomplished.



What he said , you have 5 choices for 383 pistons .

1) Cast replacement , if they are still available , they'll be about .080 in the hole , great if you are going forced induction , otherwise not even a viable choice. CH ~~ 1.850 ??? $

2) KB162 flat top Hyper , .024 in the hole wit ha valve CANYON about 6cc in size , you'll need to deck the block about .024 to get it to zero and then cut heads to get close to 80cc to get your roughly 9.ish compression using a steel shim head gasket Lighter than a stock cast and forged piston. CH 1.908 $$

3) KB400 , same as the 162 except it has a dome, piston is still .024 in the hole and has the 6cc valve canyon, even though they call this the 10.0 piston you have to deck the block and heads to get that. Not as light as the 162. CH 1.908 $$

4) Speedpro 2315 , forged flat top , NO valve reliefs and it has a tall CH than the KB so it sits about .015 in the hole , it's heavy , 1000 grams with pin. CH 1.920 $$

5) Diamond flat top , has a 5cc valve relief , it's forged and lighter than the speedpro and maybe close to the hyper , has a taller CH than hyper but shorter than the Speedpro , Diamond can change this piston for a small up charge so you could do less cutting of the block and possibly heads. $$$CH 1.916.

There is also an old Dome TRW , can't remember the number , it's got a huge dome on it .

What's your budget ? I have a 383 based stoker rotating assembly that is ready to go , it's balanced already too, will make a 450" engine. Eagle crank , K1 rods , Diamond pistons , just buy rings .