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1
Post By t walgamuth
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2
Post By strictlypersonl
04-15-2019, 04:53 PM
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CC Member
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Join Date: Jun 2018
Location: Seattle,
WA
Cobra Make, Engine: ERA 427sc
Posts: 98
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Not Ranked
Thermostat bolt lengths
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! |
04-15-2019, 08:46 PM
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Join Date: Jan 2018
Location: Lafayette,
IN
Cobra Make, Engine: Looking to buy
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You will want to maintain the full thread especially if they are threaded into aluminum.... if not the threads will pull out when you try to torque them down.
__________________
 Cobra loving, autocrossing Grandpa Architect.
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04-15-2019, 10:57 PM
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CC Member
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Join Date: Jun 2018
Location: Seattle,
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Cobra Make, Engine: ERA 427sc
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I suspect that damage has already been done, as I was unable to fully thread in the new bolts when test fitting.
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04-15-2019, 11:22 PM
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
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How are you measuring the bolt length?
Gary
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04-16-2019, 11:58 PM
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CC Member
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Join Date: Jun 2018
Location: Seattle,
WA
Cobra Make, Engine: ERA 427sc
Posts: 98
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Quote:
Originally Posted by Gaz64
How are you measuring the bolt length?
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04-17-2019, 04:34 AM
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Join Date: May 2008
Location: Brisbane,
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04-17-2019, 10:49 PM
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CC Member
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Join Date: Jun 2018
Location: Seattle,
WA
Cobra Make, Engine: ERA 427sc
Posts: 98
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Not Ranked
Thanks. I ended up just grabbing a pair of 1.75" grade 8 bolts at the local hardware store. After chasing the bolt hole threads with a tap and refitting everything, I wound up taking a bit off the bolts and ended up basically where I started, just more shank and less thread.
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04-18-2019, 09:05 AM
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Join Date: Jan 2018
Location: Lafayette,
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Cool!
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Cobra loving, autocrossing Grandpa Architect.
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04-18-2019, 09:16 AM
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 3,022
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My preference is to use studs (Loctited) into aluminum with nuts on the outside. You really don't need anything more than Grade 5.
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04-18-2019, 04:20 PM
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Quote:
Originally Posted by strictlypersonl
My preference is to use studs (Loctited) into aluminum with nuts on the outside. You really don't need anything more than Grade 5.
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Yes, less likely to pull threads, makes assembly easier.
Gary |
04-18-2019, 07:04 PM
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Studs rule!
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Cobra loving, autocrossing Grandpa Architect.
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