quadman

iTrader: (3)

anyone else having a problem with this?
ARP "LS1 flywheel bolts" will not thread into the SCAT crank, nor will stock GM LS1 flywheel bolts.
Looks like we need to get bolts with a different thread pitch?

98Aggie

iTrader: (19)

scat messed up on some of their cranks and taped them with standard SBC size and pitch. Try a 7/16 - 20 bolt and should thread right in.

quadman

iTrader: (3)

yeah, apparently i have one of the "messed up" ones. i DID try a 7/16-20 bolt shortly after my post and it fits

quadman

iTrader: (3)

greatttt..........."thrust wall"?? which part of the crank are you referring to? the part right next to the #3 main bearing?

does this pic of the crank help?

or this one of the #3 main journal?:

Haans249

iTrader: (24)

Take it to a good engine builder who knows these motors and get the crank spec'ed out, also mention the thrust wall. He should know what you're talking about. Its the part that contacts the thrust bearing on the outside of the main bearing.

racer7088

Yep all the SCAT Billets were even like that but these new ones have a normal thrust surface at full height. The bolts in the back are 7/16-20 though instead of the original metric threads.

Haans249

iTrader: (24)

Is there a casting number he can reference to ensure its a newer built piece?

racer7088

Haans,

Not that I know of but he can look to see if the thrust is full height like OEM or post a pic of the thrust. Before they only had billets but this has been fixed on all the new ones. I am the one that brought that to their attention like 10 times from being at SAM to even showing them at PRI but they seem to have it all fixed now. Originally they told me I didn't know what I was talking about but I deal with them now and their stuff works great.

quadman

iTrader: (3)

welp, i sort of have a prob with that...........being as the engine is completely assembled now and ready to go into the car. i suppose i could disassemble the engine.................again.........but i sure as hell don't want to. we didn't even discover that the M11 x 1.5 ARP flywheel bolts didn't fit until we were ready to bolt the flywheel and clutch on. we wanted to drop the engine and trans into the car last night. as a result of the 7/16 - 20 threads for the flywheel bolts, the project was brought to a halt and the engine is sitting on the floor.

so the pics i posted above don't show enough to evaluate the thrust area?
i wonder if the shipping date would offer a clue.

i bought the rotating assembly from Scoggin Dickey and it was balanced by them and shipped to me the end of February 2009.

if something was wrong with the crank, do you think Scoggin Dickey would have noticed it when they balanced the rotating assembly?

here's another pic i took during engine assembly.
it "looks" like the thrust surface of the crank is as tall as the thrust surface on the main bearing, so maybe i'm ok?

racer7088

From your pics the crank is their normal new crank and they are fine besides the different bolts.

quadman

iTrader: (3)

thanks, Erik. i greatly appreciate your input.

i'm guessing either ARP part #240-2801 or 330-2801 will work.

racer7088

have to look at your flywheel or flexplate and make sure they are old school 7/16-20s.

quadman

iTrader: (3)

This is the flywheel i'll be using (LS7):

racer7088

Just make sure the heads of the bolts fit is all I was saying like any other deal.

LSxPwrDZ

iTrader: (4)

Hey Erik, I ordered my rotating assembly from you through Eric Carey, all the cranks you balanced down there would be alright wouldnt they? Mine does have the 7/16-20 thread pitch on the crank flange as well.

racer7088

Yes they ahould be fine. Just another crank besides the different flange bolts.