Johnny5

iTrader: (2)

I'm still trying to figure this out. What size/length bolts will work to bolt up a ls1-specific converter to the TCI flexplate in a TH400? I was going to get some ARP bolts but I don't know what size.

Thanks for any help.

- john

Gilbert@Ace Racing

Hey guys... I see this question come up fairly often here at Tech.

Here is the NAPA part number that we use at ACE when we do installations.... 641-2075, there will be a quantity of 5 bolts in the box.

Hope that helps.

g

cals400ex

iTrader: (27)

i think the factory bolts are 12mm. i hear people with the TCI flexplate upgrade to 20mm because it is a lot thicker than stock. i recently purchased a meziere flexplate since it is supposed to be pretty much the best you can get. is it worth it? i have no idea. but i will admit, it is nice by the looks of it. the thickness of it is approximatly the same as stock. i will be using the stock bolts with it unless i see a further problem when i bolt it up in a few days. when you go with a longer bolt just make sure it isn't too long and bottoms out in the converter.

jermzz

iTrader: (18)

wouldn't a thicker bolt not bolt into the converter?

Johnny5

iTrader: (2)

I did end up getting some bolts that were M10 x 1.5 and 20mm in length. They bolt through the flexplate and go right to the the end of the holes in the converter. I assume they don't actually need to stick out of the converter.

cals400ex

iTrader: (27)

you need to find the correct thickness so it does fit the converter. i know yank uses metric (in my yank anyways), like stock. a lot of others do not. definatly make sure the converter bolts are not too long.