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Discussion Starter #1
I'm hoping someone could run this for me on a 383 stroker I'm putting together. I believe I made a mistake when I ordered my heads by going to 64cc with flat top pistons that put me a 10.5 cr. I'm not sure my cam is right with this or could be better. My goal was to stay away from a stall speed converter mainly cause my wife may drive it, 71 C-10 pick up.
So here goes; cam
2,250- E110321 284° IN 220° IN .472" IN 108° 0° .000" IN
5,000 Hi-Flow AH 284° EX 220° EX .472" EX .000" EX
Heads; 23 deg. angle, 200cc runners , 1.6 - 2.02 valves , heads are aluminum.
Intake is a dual plane Crosswind
Eldebrock 750 cfm carb
Block was decked .010
Rockers are 1.5
Headers
3.75 stroke 5.7 rods , 4.030 bore
Any help appreciated, Richard
 

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For what its worth.....

First off the way I see the combination as stated, it doesnt add up to a c/r of 10.5:1. You stated the block has been decked .010. What did that bring your deck height to? When I had the block decked for my current 383 project, I was targeting for a zero deck height at 9.000in. The right side was shaved .024 and the left side was cut down .026. For the sake of the exercise we'll say you started off with 9.025 and milled .010 off which still places the top of the piston .015in down the cylinder at TDC. Using this as a base, with 64cc heads, true flat top pistons (without domes or releifs), and a standard felpro 1003 head gasket you end up around 11.25:1 c/r. I plugged that c/r into the desktop dyno and set the cam specs to 220/220 @ .050 and .472/[email protected] valve with 108* lsa along with your valve sizes, intake etc. and this is what I came up with. At 2000 rpm-162hp/425lb. Torque should be relatively flat up to about 4000rpm where it maxed out at 455. HP rose steady to about 5500 and peaked at 429. These are all very generic figures with what you have given here but it sounds like your searching for numbers so here you go. When I selected the components for my stroker build I ended up using -5cc inverted dome flat top pistons and a 68 cc chamber and still am slightly above 10.5 c/r. maybe I'm missing something.
 

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Discussion Starter #3
The pistons do have reliefs and according to the piston chart it is supposed to be 10.49 cr. The block is a never been opened 4-bolt 1972. I ask the guy to mill the deck .010 to clean it up and told him to call if there was a problem with height. The 5500 rpm peak is what I was shootin for and if you need more info let me know. Thanks a lot for doing this, Richard
 
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