Dumbo The Flying Elephant

[340Cuda]

Who was the vendor?

They deserve a public pat on the back.

[Larry Hill]

Had rust on the some of the valve springs. It would seem that might be a place for failure of the spring to start. Single spring without a damper makes me plenty nervous.

[Larry Hill]

I thought we would try an Ovate wire spring. A person would think an engine that is 400 plus inches would have room and valve train support parts, not so. So to get what I think I need we ordered some parts that are too big on the OD and too small on the ID and we think what we need is hidden in the middle. I got some whittling to do.
I hope it’s not another case of buy it, try it, and then put it on the shelf.

[Todd Gross]

Originally Posted by Larry Hill

I thought we would try an Ovate wire spring. A person would think an engine that is 400 plus inches would have room and valve train support parts, not so. So to get what I think I need we ordered some parts that are too big on the OD and too small on the ID and we think what we need is hidden in the middle. I got some whittling to do.
I hope it’s not another case of buy it, try it, and then put it on the shelf.

Hi Larry. I have a 2010 version Drag Pak / 392.

I was really surprised with mine that I couldn't find a dual spring to work with the Heads & T&D Rockers. I used PAC 1427, which is their BBC Stock Eliminator Conical Spring. It's pretty beefy with 500# open and is stable up past 8300 RPM. But it's a single.

I sure would like the security of a dual.

[Larry Hill]

Yes I would feel more comfortable with a double spring. Has anyone used the Comp Cams double conical?

[Matt@PAC]

Originally Posted by Larry Hill

I thought we would try an Ovate wire spring. A person would think an engine that is 400 plus inches would have room and valve train support parts, not so. So to get what I think I need we ordered some parts that are too big on the OD and too small on the ID and we think what we need is hidden in the middle. I got some whittling to do.
I hope it’s not another case of buy it, try it, and then put it on the shelf.

Larry,


Take a look at the PAC-1238X. It may be too small on the ID, as I cannot remember what the OD of the guide boss is on those heads.

[Larry Hill]

For now I’ve fit new springs to the head and will change them out after X number of runs. Time to get ready to race.

[Larry Hill]

Going to pick Dumbo up at the body shop today. Looks like we will make
No Problem in February.

[Dyno]

The 1237X spring can be made to fit.