[ljwarneraia]

I have a 65 coupe with a new 347 stroker, centerforce clutch, T-5 trans, power rack and pinion steering. The engine has about 350 miles on it now and I had a slight vibration that occurs at at 1800 rpm it has gotten worst ove that last 60 to 80 miles. it is very strong at around 2200 rpm, Cruises fine in 5th gear at 1100 rpm. Does anyone have any suggestions or thoughts on what could be causing this. The engine does not apear to vibrate much when watching it, so I am confuseed. I do have new motor mounts and trans mount. I do have Headman headers with Magnaflow exhaust. The headers are a tight fit. Any input will help.

[2Manystangs]

you sure it's the engine and not one of the axle bearings or wheel bearings? Another possibility is the water pump...good luck

[ljwarneraia]

This Vibration occurs in netural as well as being driven.

[.boB]

When you put it together, did you put the dowel pins in the flywheel?

[wolfdog]

Might be a u-joint would not hurt to look and see.

[ljwarneraia]

Yes the clutch fyhwell was pined and torqued to spec. Not a u-joint since it get the same heavy vibration ecen in netural with out the drive saft spinning. My hearders have very limited clearence. once side is 1/8" to R&P bracket and the other is 1/16" to the shock tower.

[.boB]

Remove the front belts, and see if it goes away.

Then, go back to the basics. Make sure the firing order is correct. Use a heat gun on the header pipes, make sure they're all about the same.