sperkins

Nevermind... See post #3

dvandentop

crank bolt is a bitch no matter what usually

sperkins

I was trying to see if there was a trick to getting a socket on it to rotate the engine by hand. Needed to get #5 to TDC for leak down test.
I decided to pull the rockers instead. Much easier.

It's pretty clear I have a damaged exhaust valve.

RX-Ben

Carry some spares - you could have swapped that out in time for the Sunday TT sessions!
Get those PAC 1218s...zero issues during extended run times in the 6-7k range and I have the heavy ls-1 valves.

Gordy M

Had that problem several years ago, took a 24mm closed end wrench and a torch and offset the angle to attach to the wrench on the crank and clear the pulleys and belt.

Jason

Go pro on your forehead?

davidfarmer

put it in gear and rotate the back tires!

travisnd

If you don't want to spend a bunch of money the '02-'04 Z06 factory springs aka "yellows" can be had for $55 a set. I put a fresh set on my car when I set it up for track duty.

sperkins

Definitely will Ben. Thanks for the lead.
I pulled the drivers side head tonight and found 2 bent exhaust valves and I haven't even checked the other side. No wonder that Honda would pull be down the backstretch.

travisnd

Sweet... custom pistons. FYI no need to mess with them... just fix the valves and freshen up the heads and let 'er rip

RX-Ben

You may want to hand sand the sharp edges on the piston tops to avoid hot spots.

travisnd

I guess... but lots of guys with large cams flycut their pistsons anyway.

RX-Ben

Yep - I flycut the pistons in my RX7/LS1 setup for a big cam. My understanding is that getting rid of the sharp edges should be part of that (not totally authoritative, but step 10 - http://ls1tech.com/forums/generation...t-pistons.html)

drivinhard

that engine will never die!

get some good springs in there and good rod bolts and turn it 7k in '12

sperkins

Yep that's the plan. It's dayshavoo of last year all over again.
I'm running out of spare cylinder heads. 2 down - 1 to go.

How would I avoid getting metal shavings down into the rings? The #5 cyl wall is already scored a pretty good bit in one spot, but I hope it doesn't affect compression too much.

No kidding. I should sell it back to GM when it finally does so they can figure out how to build more like it. Springs are going in, but I'm not messing with the rod bolts.

travisnd

Scott... bring the piston to TDC, put a ring of oil around the areas you want to sand. Take a fine emory file and just knock down the edges. Then wipe up the oil and clean up the piston. I've never done that but in my head it seems like it'd work.

I used a fine emory to sand a nick on a cam bearing on my old car... didn't have any issues with it.

froggy47

So this is just a 100 or so psi air source plumbed into a plug hole, not an actual leak down test, if I understand the video correctly?

froggy47

RX-Ben

I used painters tape to mask the top of the piston/cylinder walls, sanded (400 grit and Scotch brite) and then vacuum and remove. The oil is a good idea - wet sand if using paper.

dvandentop

damn got lucky with that valve pimp slap on the piston