Crazy Cowboy

Hey guys. What size is the socket I need for the LS7 crank bolt? How big of a breaker bar does it usually take? Thanks

2k Cobra

My 07 was 24 mm.

Big!

Crazy Cowboy

Thanks. Same as the LS1.

cclive

An 8 foot piece of pipe should do it....

mewalker2

24mm is correct. I used about a 2ft breaker bar with a jack handle slid over it for more leverage. You may or may not hear it "pop" when you break it loose, as mine did not. It just slowly started loosening. Also had a large screwdriver stuck in the flywheel to prevent the crank from turning.

Crazy Cowboy

Thanks guys.

Crazy Cowboy

Just a heads up guys. I bought a 24mm at the auto store (for some reason I don't have a large metric socket set YET). It didn't fit. I tried another 12 point and it didn't either. It has to be at least a 26mm on the LS7. At least the bolt I have which was replaced when the motor was built about 10k miles ago. It is a 12 point bolt. Not sure if that's stock.

Going to buy a full set right now because all the parts are here and she's goin back together over the weekend.

Crazy Cowboy

Bolt that's in there now

Unreal

That isn't a factory bolt, it is an ARP bolt. Should still be 24 but it is a 12 point socket.

Crazy Cowboy

Just noticed that when I zoomed in on the pic it says arp right on it. It's definitely not a 24mm 12 point though. Won't even come close to fitting over that bolt head. Gonna google it now. Thx for the post!

Crazy Cowboy

ARP is a 12 point 27mm. Damn if I knew that was on there I would have bought another ARP. Much better quality for a few bucks more.

C7/Z06 Man

My understanding is that the arp bolt is reusable.

cclive

So do you know how that ARP bolt got on there?

Crazy Cowboy

Of course. When the heads and cam and motor was built by the shop. This is the first time I'm tearing it down myself. Now. Question. Is this much slack normal in a C5R timing chain?

Also. How do I find the crank gear mark for lining up the cam? Oil pump have to come off?

96mogt

ARP bolts are reusable

Crazy Cowboy

Sweet. Well I have to drop the oil pan to get the pump off to release the tensioner. Yay!!!

Crazy Cowboy

Going to start a new thread for help on reassembly

subfloor@centurytrans

You don't need to drop the pan, just loosen most of the bolts towards the front and you'll be able to remove and reinstall the pump.

Crazy Cowboy

I got it off somehow without messing with the pan anyone have the specs for torque on all the bolts for reassembly of this motor? Also which ones use red locktite and which use anti-seize?