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.
