We show how to correctly measure and shim a flexplate to bring the gap between the torque converter and flexplate between 1/8th of an inch and 3/8ths of an inch, on our 383 Stroked 1999 Chevy Suburban.
Buy the things!
Flexplate – https://www.summitracing.com/parts/TCI-399774
Shims that were the right size – https://www.summitracing.com/parts/QTI-RM-940
Shims that were the wrong size – https://www.summitracing.com/parts/CEE-4048
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@brianleishman
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555-601080 is the correct dished style flexplate. As you found out the flat flexplate don’t work. Too much gap.
Should the gaps be identical measurements? Mine are all different.
If you put any shims on a Chevrolet you are installing it incorrectly there's only 2 size flex plates and each one requires a different starter
Where can l get thise shim for my gmc envoy
So you're slimming your flex plate on the crank, and thats supposed to change the gap between the flexplate and torque converter.. Which bolt together…. I'm either really dumb or missing something.
Did you forget to add the correct counter weight?
Thank you for the info, extremely helpful,.. I'll take one of thoes burban shirts
You guys don’t have enough subscribers
Cool video. Thanks
Lube that shaft!
So you dumped a stroker crank (what….I guess crank from a 400?) ..into the 350. OK. And you had no idea you might need flex plate shims. Wow!! Well….experience is a good but harsh teacher. Makes me wonder: some previous owner of my C20 did the 383 conversion and I wonder if I may end up with similar starter motor issues. I will say I've had NO issues until late…but I don't drive the truck often. My mechanic just installed a new high torque mini (to better clear the headers). He builds rods and mainly repairs vintage machines. I am sure he paid attention to start motor gear extension. So far no issues. I guess I need to wait for the other shoe to drop!!!
What flexplate (brand and part number) did you use for this? Is this 383 Externally or internally balanced? Did you do a flexplate mounting face to block dimension, and if so what was the dimension? I have questions because I'm doing this right now (same engine and trans) and am having my clearances too close.
Thanks for the video and tips. Cool shirt, the back is weird.