Having no response to my questio on the general engine board, I am r-eposting my question here. I'm sure many of you have run into the same problem when you went to an adjustable fuel regulator.

I'm trying to figure out what size the bolts holding the upper and lower halves of the TPI fuel regulator are. Them seem to be a weird size,not 4mm x 0.7. But smaller, Might be around 3.5mm x.6 threads?

Might be SAE but can't find a match locally to verify what GM used on it.. A size and source would be greatly appreciated.

The old screws were a torx head T-10 but had the little security nub requiring a hollow T-10 wrench. An Allen head replacement would work just fine if I knew what thread it was. At least from that point I could track down a source.

Thanks in advance.

Dave Buchholz, Rochester NY
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Well, I found out what size they are. #6-40 x 1/2" I found an online source.

http://www.albanycountyfasteners.com...m?1=1&CartID=0