I'm working with a 427 SO with an expansion tank that has the 3/8" aluminum spacer. The existing bolts are rusty and the threads are damaged in a few places, so I was looking to replace them.
I ordered a set of ARP bolts from SummitRacing without checking the length first:
https://www.summitracing.com/parts/a...view/make/ford
The old ones are 1.5" which actually appears to be 3/8" short -- the threaded part is 1" which matches my measurement of the holes in the intake, and without the spacer the unthreaded part lines up nicely. They were also installed without washers fwiw (presumably to compensate thread engagement).
The new ones are 2.25" -- the threaded part is still 1", but that leaves the unthreaded part an extra 3/8" too long.
Should I be looking for 1-7/8" bolts? I haven't been able to find anything other than the 2.25" ARPs online. Or is some other part of my geometry off?
Thanks!