Using the stock block height spec of 9.98 along with a piston ch of 1.920(L2315F, no valve pockets),at .030 over, .040 gasket, 84cc heads........ I get 9.14:1.
797- swept
84- chamber
2.8 - deck
10- gasket
1- area above rings
————-
894.8 total
97.8 total minus swept
————-
9.14:1
Imo, that’s the easy button for a street 383.
Deck block for zero deck gets you to 9.38:1.
Swap to 78cc closed chamber heads and you’re at 9.95:1 with good quench.
A 1.908ch piston should be sitting .024” down the hole of an uncut block.
The 1.848ch piston would be down the hole .084”.
With the 1.848ch pistons (no dish, no valve pocket) at + .030 and 90cc heads with a shim gasket:
797- swept
90- chamber
19.8- deck
5- shim gasket
1- area above rings
————-
912.8- total
115.8 - total minus swept
————-
7.88:1
Mill the heads to 84cc and you’re at 8.25:1.
the 383 I did a few years back with .030 over 2315 pistons and '906 heads (with .015" off them) was around 9.24:1 with a .039" head gasket. the 2315 piston is an easy no brainer.
I ran the 2315 pistons .030 over - 906 heads - Mopar 284/484 cam - For 20 years in my numbers block with zero issues
Then I got greedy , and installed the E Street 75cc heads on that same setup a few years back Looking for more
Motor ran awesome , 6,000 Rpms came on really really fast on the highway running 3:91 gears if you weren’t paying attention
Right up until I kissed two intake valves , took out the pushrods , lifters , and camshaft - Again greedy
Then I decided to build my 432 Stroker
So watch your camshaft selection and valve clearance - Only disadvantage , no valve reliefs
