hey guys. this winter i wanna build a 383 for my camaro and i need some advice on a good ratio to run my compression. i plan on using summits top end kit which includes:
Cylinder Heads Included Yes
Cylinder Head Style Assembled
Cylinder Head Material Aluminum
Cylinder Head Finish Natural
Combustion Chamber Volume (cc) 64
CNC-Machined Combustion Chamber No
Intake Runner Volume (cc) 200cc
CNC-Machined Intake Runner No
CNC-Machined Exhaust Runner No
Intake Port Location Standard
Exhaust Port Location Standard
Spark Plug Style Straight
Intake Valves Included Yes
Intake Valve Diameter (in) 2.020 in.
Exhaust Valves Included Yes
Exhaust Valve Diameter (in) 1.600 in.
Valve Springs Included Yes
Outside Diameter of Outer Spring (in) 1.430 in.
Damper Spring Included Yes
Number of Springs Per Valve Dual
Retainers Included Yes
Retainer Material Chromoly steel
Locks Included Yes
Lock Style 7 degree
Valve Stem Seals Included Yes
Valve Stem Seal Style PC seal
Rocker Arm Studs Included Yes
Rocker Arm Nut Thread Size 3/8-24 in.
Rocker Arms Included No
Guideplates Included Yes
Accessory Bolt Holes Drilled Yes
Valve Guides Included Yes
Valve Guide Material Phosphorous bronze
Valve Seats Machined Yes
Valve Seat Material Ductile iron
Steam Holes Drilled No
Oiling Style Through pushrod
Machined for O-Ring No
Heat Crossover No
Head Gaskets Included Yes
Intake Manifold Included Yes
Carburetor Quantity One
Intake Style Dual plane
Basic Operating RPM Range 3,000-6,500
Intake Finish Natural
Intake Material Aluminum
Intake Manifold Gaskets Included Yes
Intake Manifold Fasteners Included Yes
Camshaft Included Yes
Cam Style Hydraulic flat tappet
Intake Duration at 050 inch Lift 234
Exhaust Duration at 050 inch Lift 244
Duration at 050 inch Lift 234 int./244 exh.
Advertised Intake Duration 292
Advertised Exhaust Duration 302
Advertised Duration 292 int./302 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.488 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.510 in.
Valve Lift with Factory Rocker Arm Ratio 0.488 int./0.510 exh.
Lifters Included Yes
Pushrods Included No
Timing Chain and Gears Included Yes
Quantity Sold as a kit.
Notes Pushrod length checker included. Recommended 3,000+ stall and gearing.

any advice would be helpful thanks.

 

Only things of any relevance to your question.

Read this
http://members.uia.net/pkelley2/DynamicCR.html

Download and run the DCR calculator (at bottom of page) to see what you get with different CR
( change piston dish size / block deck height / gasket thickness to change CR )

 

Personally I love a good high compression engine. 64 cc heads plus flat top pistons give you roughly some where between 10.5:1 to 11:1 Gasket thickness and the block being decked will change this. But I'd recommend somewhere in that range.

 

What I'm trying to figure out is what size pistons I'm gonna need to get. I wanna be able to run pump gas on it bc I'm in Ak and there is only one place I know of for race fuel and I want this more for street/strip. Thanks for all the help

 

I have a 355 (same block, just less the 383 crank) I am running 64cc heads with flat top pistons and my block has been decked. Running on 93 pump gas with no issues. Tho Ive always wanted to see what 97 would do lol

 

so you are using -4 pistons? since they have the valve reliefs. i would love to run higher octane but its an hour drive to get there really wouldnt be worth my drive unless im up there at the strip that is open like 4 months lol.

 

Use the calculator I linked to work out what the CR will be with what pistons.
No two engine combos are the same.

FWIW ;
my 12.1 383 runs great on 93 but the big cam I have drops the DCR to a acceptable level
( read the article I linked above for explanation and importance of DCR)


Cam duration has a major effect on what CR you can run without getting detonation
on a certain octane fuel