Quote:

Here are the pics. 100 gram weight saving.

Specs 383

Bore 4.25 +.030,.040,060
Stroke 3.38
1.930 will be the stock c.d. If you need less no extra cost.
6.7 cc valve notches (Pistons are not L or R with these notches) Big valve version will be L and R at no extra cost.
6.358 rod.
1.094 pin (.990 pin no cost option) Press or float, new style (round) lock rings included.

Price $625.00 plus shipping.



That hurts right there that a compression killer , as you know the 383 has enough trouble building compression with the stock stroke.

You made a piston , if it is 1.920 that only has a .004 taller CH than a diamond piston that is lighter and has almost 2cc smaller valve reliefs.

Here's the problem I see , there are 3 383 piston for 4bbl HP type 383's , the 59-67 with closed chamber , the 68-69 with open chamber and 70-71.

The 383 forged crank is 3.375 stroke , the 400 cast (and possibly 71 383-2bbl ??) is 3.38.

Math ... 9.980 - 3.375/2 - 6.358= 1.9345

The 68-69 Hp pistons are 1.932

Those rebuilding 383's are CHEAP , they have a hard time justifying the cost to do it right because many have been halfarseing it for too long and getting by with it.

I do applaud the effort , but there really needs to be a QUENCH DOME 383 piston , too many of these guys are still stuck in 1970 and still think the 906 is the best head for a big block.

You need to sit down and do the math to figure out what would be the best compromise to cover both the 906/346 and the 452 variants as open part of the chamber depth is different between the two from my limited experience.