I have used the Blue Thunder aluminum turtles (clamps) only on the Blue Thunder intake manifolds.  The BT turtles are offset on the mounting holes so that could give issues when used on other manifolds.  For all the other intake manifolds, I’ve simply used the factory or oem turtles.  Be aware that there were different sizes on those oem turtles and some of the early designs may be just too long to fit some of the aftermarket manifolds.  When I get a chance, I’ll post a picture showing some of the various factory turtles.

Lorena, Texas (South of Waco)

Use your originals.  That's all we had in the '50s.

John - "The Hoosier Hurricane"

I have an Aluminum Offy but no Clamps. Can I use the Ones that are used on the original Cast Iron Intake or do I need to look for others?

  

Thank you to every one who responder to my questions.---Jim

Ted, which do you think would work best with an Edelbrock 573 intake?  I am a bit "worried" about the off-set on the Blue Thunder Clamps, although I like the looks of them better.  Thanks for your opinion, it is valuable to me. I still have not found a price listed any where for either, or a source for the Blue Thunder clamps, other than e-bay 

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Thanks Charlie.  While the picture of John’s clamps closely mimic the look of the oem clamps, the Blue Thunder clamps have a different look.  Here’s a picture of the Blue Thunder manifold clamps (turtles).
 

Lorena, Texas (South of Waco)

The Blue Thunder clamps are cast aluminum with a slight counterbore for a washer.  John does show some cast aluminum clamps on his website.  http://www.ford-y-block.com/accessories.htm 

I had to trim some of the clamps for use with my Blue Thuinder manifold in order for them to work better with the manifold.  Easy to do with a belt or disc sander.  These were produced over 10 years ago so new ones might be different and might not be a problem when used with a stock manifold..


Lawrenceville, GA

I may have been mistaken on where I got them. I was thinking I got them from John but it's been 5 years since I bought them.

Durham Missouri

While I was not aware of John Mummert offering the aluminum turtles (clamps) for the Ford Y intake manifolds, they are available from Blue Thunder.  For the Blue Thunder Y intakes, the turtles are an extra cost option but I always order them when also ordering the BT intakes.  While I use those aluminum turtles with the BT intakes, I’ve never needed them for use with other Y intake manifolds simply due to having a plentiful supply of oem turtles.

Lorena, Texas (South of Waco)