Are ARP bolts a rip off? Or worth the money?

[ls2 cruiser]

The length of my bolts from memory are 1 1/4" and they are 7/16" unf. They go through the very thich billet arms and come out the other side a bit. I only used 7/16" unf as the billet convertor comes that way. It is "ASNEW" brand. The TCI flexplate being US made would be AF size probably. For your info a grade 8 bolt has 6 dashes on the top. Grade 5 has 3 dashes.

[John_LS1]

If the flex plate had 12 mm holes then an m12 bolt will be a very tight interference fit

It's not exactly 12mm probably 12.5 I stuck a m12 bolt thru and it was fine. I don't have my verniers to measure it.

[peter b]

It's not exactly 12mm probably 12.5 I stuck a m12 bolt thru and it was fine. I don't have my verniers to measure it.

ahh ok thats fair then.

[ls1gino]

i had a look at my ones and they are 10.9 grade silver bolts (prob just a antirust coating) but to my surprise they actually don't screw into all the thread on my TCE converter. they are M10x20mm and have a 20mm head on them. they did go thru on my old allfast converter but it must have has a thinner plate where the bolt holes went.

the factory bolts are M10x15mm. I think i will use M12x30mm when i get a custom converter made for a T400 to LS1 as the TCI Flexplate has 12 mm holes in it already.

hmmmm weird.. we got different bolts with our plates too?? yeah that would be the best idea, i would have done the same if i didnt have my convertor already... and then this begs the question why have such big holes for only M10 bolts?!?! im assuming the little sections they weld on where the bolts go threw to the convertor are probably a generic peice, they just weld them onto every plate for any model, some factory convertors probably run m12 bolts..

[ls2 cruiser]

The TCI flexplate is a very strong and heavy flexplate that is used for drag racing and it usually matches up with Billet converters which can have bigger bolts. It does not matter though as the centre hole centres the flexplate and the bolts just hold it on to the converter.

[itsme4g63]

I found arp bolts to be very effective at every case compared to oem, mainly use their head studs/rod bolts/crank cradle bolts.