Variations on Dino Recipes

[maxparrish]

I am in the planning stages of my stroker so I thought I post a few specs and obtain answers to some questions, hopefully from Dino. The first is a small variation on the 232 based stroker called "mild":

My assumption, from the forum calculator, is that the original recipe (my variation below) had a default -.003 deck height with this piston and rod combination, without any deck cutting. This would result in the spec .040 quench and original CR of 8.8:1. I wanted to boost static compression a little, to 9:03 to 1 so as to still run 87 or 89 octane, but without deck cutting. So I only dished to 19cc (not 23cc) but used a stock head gasket thickness to obtain the target number. I wish keep compression around 9:1 NOT to save on gas costs but to borrow other folks lower octane gas in a long group outing, if needed.(It's happened on long trail trips). Also, I am at sea level.

So I assume this would allow me to stick with either 87 or 89 octane at sea level. If anyone knows how far one can push compression to run on 89 octane at sea level I would be curious.

So here is milder with slightly wilder:

AMC 232 3.500" stroke crank
Jeep 4.0L 6.125" rods
Silvolite UEM-2229 +0.060" bore pistons
Increase piston dish volume to 19cc
9.03:1 SCR, 8.17 DCR
CompCams 68-115-4 192/200 degree camshaft
Ported HO 1.91"/1.50" cylinder head
0.051" head gasket
0.048" quench height
Ford 24lb/hr injectors for '87-'95 engines, Accel 24lb/hr injectors for '96-'04 engines, '98 Chevy LS1 25.2lb/hr injectors for '05-'06 engines.

Any thoughts or concerns with this setup? Should I expect any significant expansion of combustion chamber CC with porting and polishing?

Thanks all...

Max

[maxparrish]

My second design is a variation on the "rockcrawler" 4.6 recipe. I've increased bore to .060 over, making it a 4.7. I've also increased deck milling to .042 (original was .035). According to the calculator, that means a final deck of .003 over zero deck. Finally, I've been slightly less aggressive in dishing the pistons, to 29cc. This should result in a SCR of 9.05 to 1 and an SCR of 8.24:1. Quench is also tightened to .046. Again I am aiming for 87 to 89 octane.

4.6L (now 4.7L) Low-buck, low CR "rockcrawler"

Jeep 4.2L 3.895" stroke crank
Jeep 4.2L 5.875" rods
Silvolite UEM-2229 +0.060" bore pistons
Increase piston dish volume to 29cc
9.05:1 SCR, 8,24 DCR
CompCams 68-115-4 192/200 degree camshaft
Ported HO 1.91"/1.50" cylinder head
Mill block deck 0.042"
Mopar/Victor 0.043" head gasket
0.046" quench height
Ford 24lb/hr injectors for '87-'95 engines, Accel 24lb/hr injectors for '96-'04 engines, '98 Chevy LS1 25.2lb/hr injectors for '05-'06 engines

Given my changes, do I need a more aggressive CAM? Any other thoughts?