sunofrufus

I'm trying to determine if i have a long or short crank 6.0 and if i have the right flywheel to mate it to my 4l80e



Backside of flywheel



thanks in advance for the help

S10xGN

iTrader: (11)

Short crank, you'll need the spacer and bolts. If the flywheel is flat (no arch), put the spacer on first.

gofastwclass

iTrader: (2)

You have a long crank 6.0 and that is the proper (flat) flywheel. You need nothing but bolts and an engine bay for them to mate and live happily ever after.

Seriously, if the mounting surface on the back of the crank was even with the gasket you would have the "short" crank, but yours sticks out .400" so you have the "long" version.

S10xGN

iTrader: (11)

Wow, howsabout that! I've got a one-off Corvette motor! As far as I knew, only certain trucks came with the "long"cranks. Here's a pic of the stock '03 C-5 engine (transplanted in my Maverick) undergoing a rear main seal job. Looks like the same crank as yours. This particular crank (whatever the "length") required the spacer and bolts to mate up a 200R4. Guess you better solicit some other opinions...

gofastwclass

iTrader: (2)

Your're right only certain (early as I have been told) trucks had the long crank. I'm going to look for my pics since the engine has been installed for quite a while. It looked like a long one to me but you may be right - it might be a newer one.

sunofrufus

i appreciate all suggestions on this.... i've been looking around for that magic post with a picture of the long crank in comparison to the short but hadn't had any luck so far...
the flywheel i have is flat.... i know it didnt come off the motor that i have so that is mainly why im trying to determine if this is right combo before i bolt all this in

scj

iTrader: (89)

if you have access to take the oil pan off and look at the casting number on one of the counter weights you can tell by that.

All of the '99 - '00 cranks had the 12552215 casting with the wide flange.
All of the '01-'04 cranks used the 12552216 casting with the narrow flange.

scj

iTrader: (89)

here you go.

the one on the left is the 12552216 which is the narrow flange, and the one on the right is the 12552215 which is the wide flange.

sunofrufus

ok thanks man i'm gonna try and get pan off tomorrow and look at casting numbers

scj

iTrader: (89)

no problem man, i looked everywhere for this info as well because i wasn't positive on the year model of the lq4 i got. this seems to be the correct info.

sunofrufus

pulled pan off today and it is a short flange crank #12552216

thanks again

the_merv

iTrader: (88)

Def the short crank..long one sticks out minimum .5"

xlcooplx

iTrader: (26)

99-00 iron headed 6Ls had the long crank. 01+ aluminum headed engines have the shorter snout.