z28_n_tx

iTrader: (7)

I have a yank3600 stall going in next wk. To myunderstanding the bolts supplied are a bit short right?? Can some one point me inthe right dirrection to getting the correct bolts..

highgear

I am on my second converter and I have always gone to my local Chev dealer for torque converter bolts and they have fit perfect. They come with blue locktite on them.

z28_n_tx

iTrader: (7)

So you just buy new stock converter bolts??

Yank

iTrader: (181)

Bolts supplied are correct for stock flexplate usage

highgear

Yeah, I always use new bolts from GM. I also still have the stock flexplate.

Jays_SSZ28

iTrader: (2)

Stock LS1 type bolts are too long for a converter with a billet front cover. Billet fronts have blind bolt holes and a long bolt will tighten because it's bottomed out, not because it's holding the flexplate.

I've used two sponsor converters from here and they both came with bolts that are standard stock at Ace hardware, and were only metric grade 8.8, stock bolts are 10.9.

The industry standard bolt thread length engagement is 1 1/2 times the diameter of the bolt. None of the suppied bolts I've ever had were long enough going by that.

I have found that stock 70's, 80's style bolts, easily found in any auto parts store motormite Help section are the perfect size and are metric graded 9.8, and thats whats in my car now.

Sweet_SS

Make sure to use some loctite.

z28_n_tx

iTrader: (7)

Fortgot to add that I'm not using the stock flexplate. Mine is thicker. It's the eBay one that most
Ppl go with. So should I use the bolts supplied with the tc???

Jays_SSZ28

iTrader: (2)

Not to step on Yanks feet.

The best thing to do would be to measure the thickness of the flexplate, add that to the bolt diameter x 1.5. Also add any shim thickness if needed.

Flexplate thickness + (bolt diameter x 1.5) = bolt you need.

Make sure they are either washer head bolts or have oversized hex heads.

01ssreda4

iTrader: (96)

^^^^ Exactly. You must figure out flexplate thickeness, shim thickness, and how far you want you bolt to go into the converter. Too long and it will bottom out. I bought some nice bolts from oriellys and cut them to the exact length I needed.

z28_n_tx

iTrader: (7)

Ok grade 8 or higher . Right??

Circle-D

iTrader: (21)

You probably need a 16mm long bolt if you are using the CAT flex-plate. If you will need shims, might be able to step up to the 20mm in length.

Chris

Jays_SSZ28

iTrader: (2)

Metric is graded different than SAE.
Metric grade 10.9 is actually equal to SAE grade 8, both converters I bought came with 8.8's. Stock bolts are 10.9.

I know Ace hardware has a good selection metric bolts in grades 8.8, 9.8, 10.9, and 12.9 with the bigger 17mm hex head.