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Old 03-02-2010, 11:06 AM
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need help ID'ing 383 parts

Hello all, been lurking for years and have found alot of great info on this site. Need to get some info on this 383 I have here. I bought the motor from a guy that pulled it from a 68 firebird cause he wanted to put a pontiac 400 in it. My guess is that whoever sold the car swapped out the heads before selling the car with some stock 882 heads. Reason I know that is cause the block is painted really nice and the heads and waterpump had some crap paint on them and theres no paint on the back of the heads where the firewall would be. Anyways ill make a list of things I do know.

3970010 4 bolt main block (not sure if its been decked or not)

Eagle h beam rods (say 5700B on them)

JE pistons (4.030 SRP40F) they are flat top with valve reliefs, id like to figure out a part number on these since they have no markings

Comp Cams 12-250-3

Would like to ID the crank, Im sure its balanced going off the weights that are tig welded in it and holes that have been bored in it.

Externally balanced flywheel and harmonic balancer


Guess thats about it. I had the motor running last year but have since bought some dart iron eagle heads (64cc) for it and would like to get it back together. The motor had a really bad shake when it revved up last year. Not sure if that was caused by the factory heads or not?? Id appreciate any help anybody can offer me with this.
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Old 03-02-2010, 12:19 PM
richard stewart 3rd's Avatar
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Hi,
The only thing I could come up with is the
pistons were made before they started lazier
marking them in 2004, it cost $75. for reversed
engineering to figure out what they are.
Rich
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Old 03-02-2010, 03:57 PM
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Im thinking these are them here from the SRP site. These are the specs.

____________C.I. bore stroke rod height comp. height
Part #138089 383 4.030 3.750 5.700 9.000 1.425
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Old 03-02-2010, 09:48 PM
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Crank looks to be an Eagle cast crank, and by the amount of weight added into the counterweight in that pic it looks to be internally balanced . Are you sure you don't have the wrong balancer and flexplate on it?? Maybe they "swapped" out good SFI rpm rated parts before you got it, like the heads were "swapped"?? This is relative to your vibration comment. Looks like you may have to tear it down and have the balance checked to know for sure.

Heads are not likely to have caused a vibration.
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Old 03-03-2010, 06:16 AM
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The flywheel that was on it was externally balanced along with the balancer up front. Maybe ill just pull it and have it checked out to be safe. I wanna get everything measured out properly so I can figure the compression ratio to know what octane i need to run.
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