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Old 04-26-2004, 10:14 AM
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Shelby hi rise

I am currently runnung a 1966 origional hi rise on my 289. I took it off to clean it and have the underside ceramic coated. I noticed two things that I questioned. The first is that there is a heat sheild looking plate on the underside that is held on by four rivets. This plate is evenly loose(about 1/32 gap). I was wondering if it was supposed to be loose, if it is not then how does it tighten. Also during the process I noticed that in small letters on the underside is stamped with the Offenhauser logo. Did Offy make these for Shelby or what is the deal with that?

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Old 04-26-2004, 10:34 AM
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Remove the cover by prying up on the studs, they are held in with a short helix that "bites" into the casting. This is just a heat shield to prevent oil from cooking on the bottom of the manifold, that heat riser gets hot. There is likely a bit of crud trapped underneath that you can clean up.
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Old 04-26-2004, 10:42 AM
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Question

Where did you source the intake? Does it have SHELBY or COBRA cast onto the top?



The pan underneath is a splash shield designed to keep motor oil from adhering underneath the intake and hardening, resulting in drawing engine heat into it. It should not be loose. The rivets are simply pressed in. You might trying to gently tap them back in and see if they will hold the tension. If not, you might want to remove them, tap the bores and insert capscrews with Loctite. I would even go so far as to Heli-Coil the holes.

Anyway you can take some quality digital photos of the top and where it is stamped OFFY? SHELBY later sold accessory items such as intakes and wheels. I had no idea OFFY was a source.
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Old 04-26-2004, 12:05 PM
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The numbers on the intake are S2MS942A. It came on a 66 Mustang GT once owned by Travis Carter. It has some rare items such as HiPo heads that were done by Holman Moody as well as the cam. The intake has COBRA in solid letters cast on it. I can try to post pictures of it. I did just get the rivets out , the info helped, but as for why it has Offenhauser stamped on it I do not know.

The numbers on the intake are S2MS942A. It came on a 66 Mustang GT once owned by Travis Carter. It has some rare items such as HiPo heads that were done by Holman Moody as well as the cam. The intake has COBRA in solid letters cast on it. I can try to post pictures of it. I did just get the rivets out , the info helped, but as for why it has Offenhauser stamped on it I do not know.

Last edited by RJL; 04-26-2004 at 12:05 PM.
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Old 04-26-2004, 12:10 PM
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Quote:
Originally posted by RJL


The numbers on the intake are S2MS942A.
S2MS 9425 A (correct?) Along with the firing order?

Quote:
...why it has Offenhauser stamped on it I do not know.
OFFY must (may) have been the origional vendor for SHELBY. I have never come across this before. Photos would be appreciated before you put it back together.
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Old 04-26-2004, 12:15 PM
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Yes those numbers are correct. It also has FIREING ORDER 15426378. It will be a day or so for the pics.
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