Author Topic: what compression ratio and cam shoud i run on my 383. build details inside  (Read 4265 times)

Offline Nospark

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Forged Bottom end 383

scat 4340 forged H-beam rods
scat 4340 forged Crank
Brodix Track 1X heads 2.10 intake/1.6 exhaust full roller 68cc combustion chamber
optimal rpm range for the heads is 3500-7000

I need to figure out what pistons I should run flat or dished also what cam do you guys recommend?

once the motor goes in the truck it will no longer be a daily driven street truck just a play/mud truck.
79 K10 work in progress

Offline Captkaos

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Re: what compression ratio and cam shoud i run on my 383. build details inside
« Reply #1 on: February 14, 2011, 05:53:50 pm »
That is a lot of head flow volume for a mud truck.  Brodix recommends a minimum of 11.5:1 for those head and a roller or flat tappet cam.

Offline 1980c10

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Re: what compression ratio and cam shoud i run on my 383. build details inside
« Reply #2 on: February 14, 2011, 06:20:32 pm »
what fuel do you want to run?

Offline Nospark

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Re: what compression ratio and cam shoud i run on my 383. build details inside
« Reply #3 on: February 14, 2011, 10:05:22 pm »
been looking at a lunati solid roller.   Truck will no longer be street driven when motor goes in.  Will be running VP C12 108 octane
79 K10 work in progress

Offline Nospark

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Re: what compression ratio and cam shoud i run on my 383. build details inside
« Reply #4 on: February 14, 2011, 10:11:17 pm »
I know I can build a big block easier for the HP I am looking for but I have 2 4bolt main Small blocks and itchin to be built.
79 K10 work in progress

Offline 1980c10

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Re: what compression ratio and cam shoud i run on my 383. build details inside
« Reply #5 on: February 14, 2011, 10:53:44 pm »
your cam should match the rpm range recommended on the heads, and your pistons should match the recommended compression ratio assuming this will be naturally aspirated as well as all other components. You may also want to zero deck the block to help get your self to the recommended cr. I'm guessing 12-13 to 1 cr this means you'll use a domed piston
look for a compression ratio calculator online they are easy to find this will help you get to your desired cr

Offline Nospark

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Re: what compression ratio and cam shoud i run on my 383. build details inside
« Reply #6 on: February 15, 2011, 06:38:22 am »
Thanks everybody for your help!  I appreciate it!  Should be a pretty wild motor when its done.

79 K10 work in progress