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I have a gen 3 6.0 block and 4l80. No idea what they are out of as I bought them from rebuilders.
Originally I got the flat ac delco flexplate. Didn’t fit right. I ordered atp-z270 that has the spacer built in and it’s all good from the flexplate standpoint.
Now the issue is the starter doesn’t sit right with the flexplate. The starter needs about a 3/8” spacer. Summit advised on the flexplate and starter. The starter is a power master 9109.
What year is your 6.0, cast iron heads by chance? Where's the flywheel and starter that originally came with the engine/transmission?
bought from a rebuilder so even he doesn’t remember what year it was out of. I have 823 heads on there. I bought as a short block so it was pretty bare bones. This is why I’m struggling.
A pic at rear of the crank where the flywheel bolts (without flywheel) will show if it is a long or regular crank. In my experience, all gen 3 starters I've had were interchangeable.
A pic at rear of the crank where the flywheel bolts (without flywheel) will show if it is a long or regular crank. In my experience, all gen 3 starters I've had were interchangeable.
the starter is the issue. Got the flywheel figured out with the one I mentioned in the first post. I talked to a few people at summit and the shop that did my vette. All we can come up with is that I got an improper machined starter. I have to wait until tomorrow to get a replacement sent from summit due to customer service being closed on weekends.
It is fact that I needed a spacer or the flywheel I bought with the spacer installed. The starter just needs spaced 3/8” to fit.
unfortunately no pics of the crank. I only have front side pictures. I’m handling this remote from Seattle while a friend in Kansas does the swap.
I'd grab the cheapest parts store Silverado starter and have him try it on there. That will tell you if the problem is in the starter or on the engine side. Return when done.
I'd grab the cheapest parts store Silverado starter and have him try it on there. That will tell you if the problem is in the starter or on the engine side. Return when done.
did that today. Not the starter. Can someone link me the right flexplate since I’m getting it doing?
Mark a tooth on the ring gear and count them to verify it is 168. If it is more, then that would be the issue and could have been mis-packaged.
My initial thought is you got a 153 tooth starter, but the stock starter would indicate a ring gear diameter issue (unless it was boxed wrong). LS engines only came with 142 (LS4) and 168 (all others) tooth ring gears.
I think one of the issues is the starter and depending on what crankshaft you have it could be the problem. In the Gen III 6.0 block I built for the 99 car I used the crankshaft from my 01 car which has a standard length crank flange. I purchased a TCI 399754 flexplate with an OEM starter for 2003 Silverado 1500HD truck. That flexplate is designed to be used with TH400 converters and for 4L80E transmissions.
Most LS engines have a standard-length crankshaft flange. These engines use a dished flexplate with an adapter to connect with older-style transmissions (non-LS). For modern LS-style transmissions, a flat flexplate is used, with no spacer needed. The longer crank flange is found only on 1999–2000 6.0L LS engines. It is approximately 0.400–0.550 inches longer than the standard flange and when mating a long-crank 6.0L to an older (non-LS) transmission, you use a flat flexplate with no spacer. Using a standard (dished) flexplate on this engine will result in the starter not engaging properly, or other fitment issues.
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Help with flywheel and starter issue 
