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Old 06-11-2005, 11:19 AM
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Is it a Steel or a Cast Crank?

I have a sbc , and i don't know how to tell if it's a forged steel or cast crank? it has what looks like casting mold marks on it, but i'm not sure. please help, thanks! and do you need to use 383 pistons in a 350 block to make a 383, or are they 350 pistons, with a 400 crank?
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Old 06-11-2005, 11:39 AM
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If you have a pic of the crank i can tell you if it's cast or steel.

The 383 chevy is a 350 block, 400 crank. If you use 400 rods a 350 piston works, if you use 350 rods you need a special 383 piston.
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Old 06-11-2005, 11:43 AM
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The easiest and quickest way to tell a forged crank from a cast unit is by the parting line in the front of the rod throw. If the parting line is thin (approx. 1/8"), then it is cast, if it is approx. 3'8" wide it is a forging. A forged crank also has a smoother appearance to the counterweights.
A 383 can be done 2 ways. First is a 350 piston with a 400 rod (5.565) and 400 crank. The second and more popular way, is with a 350 rod (5.7) , a 400 crank and a special piston for a 383. These pistons are common and made by many manufacturers in many configurations (forged, cast, hyper).
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Old 06-11-2005, 01:00 PM
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here is the biggest pic i could upload.. thanks
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Old 06-11-2005, 01:03 PM
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couple more
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Old 06-11-2005, 01:05 PM
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how could i tell what cc these heads are?
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Old 06-11-2005, 01:10 PM
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Quote:
Originally Posted by topfuel
A 383 can be done 2 ways. First is a 350 piston with a 400 rod (5.565) and 400 crank. The second and more popular way, is with a 350 rod (5.7) , a 400 crank and a special piston for a 383. These pistons are common and made by many manufacturers in many configurations (forged, cast, hyper).
whats the best way ? everything need balanced correct ?




Mustangsaly
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Old 06-11-2005, 01:15 PM
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I have confirmied that it has 350 pistons in it, i was told it is a 383.. what is the next step in checking this? measure rod length? how would i measure the crank? or check it?
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Old 06-11-2005, 02:30 PM
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It appears to be a forged crank with aluminum rods.

How did you verify that it has 350 pistons?
To check the cc'c you need a 100 cc syringe from the drug store. or buy a kit.
Mustang S, yes, it must be balanced.
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Old 06-11-2005, 03:14 PM
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To check the cc on the heads, cover the chamber with a piece of glass, plexiglas, lexan, etc. Grease or petroleum jelly on the head surface will create a water tight seal against the glass. Grease up the valves too so they don't leak (just in case). Leave one top corner open so you can inject water. Then just use a syringe or pipette to inject water and find the volume.

Judging from the picture the chambers are really small. Maybe 40 cc, maybe even less. Where did this motor come from? It looks pretty serious with the aluminum rods and all...
dh
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Old 06-11-2005, 03:15 PM
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Mustang S if it's the best way or not depends on your application and what you want from it, but the easiest way is with 350 pistons and 400 rods. That goes together easy and doesn't require any real massaging. It is generally a lower RPM combination though. The best all around setup as far as cost and ease of assembly I have found is the 350 rod (5.7) and a 383 specific piston. It requires a little grinding on the rod bolt heads or a small base circle cam for clearance. I personally prefer the second method. I know many people will disagree with me, but I don't like grinding on a critical component such as a rod bolt. Then there is the 6" rod and special piston setup. This is best suited to higher RPM applications and loads the cylinder walls less.
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Old 06-11-2005, 03:48 PM
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The crank is an 1182 (saw it in the picture) that is a forged 350 crank. I have one out in the garage.

Judging by the chamber and the rods, I would guess that was an alcohol engine, is that correct?

Did you buy it complete? What was it out of. I can tell you is it not a street engine with those rods.

Looks like you bought a 350 not a 383. You can't make a 383 with a 350 crank, UNLESS it is a 400 block and bored over. What is the casting number on the block?

Royce
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Old 06-11-2005, 05:00 PM
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man you guys are a wealth of knowledge!!!! Thanks for all the info... To answer some questions,, yes it is an alcohol engine. it was in a super comp dragster.. it originally ran on a rond injection which i sold because i couldn't run it on the street. turns out this whole motor is useless on the street.. i know the pistons are 350 pistons because i checked the numbers on them. they are trw, L2252a mild dome pistons.. .060 over. I also ran the block number and it came up as a 350 4 bolt main. SO you are telling me i deffinetly have a 350 not 383? because i bought this motor from a freind and he told me it was a 383. but it seems it is not. 350 crank, 350 pistons, rods? and 350 block.. means it's a 350.. i got $@#@%! I layed the heads upside down, and poured water in them from a cc measuring devise.. i came up with roughly 60CC. dose this sound right? i'm tring to figure out if i can swap rods and pistons, and get this puppy to run on 93 octane... what do you guys think..
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Old 06-11-2005, 05:06 PM
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Quote:
Originally Posted by camaroman7d
The crank is an 1182 (saw it in the picture) that is a forged 350 crank. I have one out in the garage.

Judging by the chamber and the rods, I would guess that was an alcohol engine, is that correct?

Did you buy it complete? What was it out of. I can tell you is it not a street engine with those rods.

Looks like you bought a 350 not a 383. You can't make a 383 with a 350 crank, UNLESS it is a 400 block and bored over. What is the casting number on the block?

Royce
1182... is there a book or something where you find what all these numbers mean? thanks.. is a 350 block and it has 350 pistons...
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Old 06-11-2005, 05:07 PM
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Why heck, if it's useless to you i'm sure i can do something with it.

And personally I'd have a 350 over a 383 any day(at least if i was keeping it for myself, if i was selling it ...well now that'd be a different story!)

If you don't mind me asking, what did you pay?
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