rodj

Seem to recall where visible, cast crank had narrow line and forged had wide line.
How do you tell whether a crank is cast or forged if it has been polished so no casting / forging marks are visible?
Scat crank

drochau

Does scat make forged cranks?

cv67

Scat makes forged cranks. THere is a way to tell by the pitch of the ring if you tap a couterweight with a hammer. One is higher pitched than the other (cast vs. forged). Can't remember which is which.

rodj

Yep , part # starting with "9" are cast steel ,
ones with 4,5 ,7 from memory are forged,Different types , weights mainly.
As in 4-350-3750-5700-L for a forged 383 stroker crank to suit 5,7 rod and late 1 pce seal.
The same # with a "9" is a cast crank of the same specs

jburnett

A forged crank will ring like a bell... Cast cranks just have a dull "clank." The "parting line" is the thin line on visible on the counterweight on cast crankshafts; it's where the two halves of the mold fit. Forged cranks usually have a very wide, parting line if any at all.
-Jeb

mikey whipreck

double post

mikey whipreck

I think forged and cast cranks both 'ring like a bell.' ...

http://forums.corvetteforum.com/show...nk&forum_id=48

jburnett

No, I can assure you they do not... Put it on a solid surface, like a concrete floor, and the forged crank will sound like a tuning fork. A cast crank will give off a dull "clank". One other thing I'll point out in that thread is that the LAST forged steel cranks installed in Corvettes (or any other GM production engine) was that in the L82 engines which had its last year in 1980. They also featured forged slugs, big valve heads (albeit crappy 882 'smoggers'), and screw in rocker studs.
-Jeb

CFI-EFI

Thanks, Jeb. I knew that was correct, but I didn't have all the info, years, etc. to back it up. Too many people claimed that their cast cranks "rang like a bell".

RACE ON!!!

Pete K

Good info. I never tried to ring it on a garage (concrete) floor. I always did it on the bench.

mikey whipreck

interesting...

REW89

S0 which is stronger? Cast? I assume thast since the last forged cranks were in the old 82 smoggers, cast must be better?

Bob

Zix

A forged crank is stonger than a cast crank, they are no longer used very often mainly because of cost I would assume

Dan Parker '96

If you guys are banging cranks on your garage floor then I say....
Aww forget it.

You are banging cranks on a garage floor.

Pete K