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The major auto mfgs have not made ( or sourced ) flat tappets since the late 80's early 90's. The machines that make flat tappets are worn, the knowledge to quality check them has retired. It's the tappets.
Its going to depend on final drive and tire size but it should be more than 200rpm, example in photos below.
Another option is the Passon Hemi OD trans. I currently am running one of these and have been mostly happy with it. With every option it seems like there is a compromise, TKX is big $$...
Question, stock engine mounts? The engine can be moved around almost 1/2" in the vertical and horizontal. Would this possibly help? Used to run into this with my Dart, until I went tubular front suspension and git rid of the torsion bars.
Steve Cropper, Legendary Guitarist for Booker T. & the MG’s, Otis Redding and the Blues Brothers, Dies at 84
https://variety.com/2025/music/news/steve-cropper-dead-guitarist-booker-t-otis-redding-blues-brothers-1236599198/
I measure 5/8" for the diameter inside the installed rubber grommet. I purchased the valve covers used/second hand so don't know the history of the grommet. From above responses, it seems I have the wrong grommet not the wrong PCV valve. I'll be looking into it further. Thank you.
Yes, I know, painted headers. this purchase was primarily budget based as I am trying to get this car to where I can get it on the road. It currently has no exhaust. I would have liked to have gotten something a lot nicer but I have a pretty tight budget with what I am trying to do.
The pictured Direct Connection valve covers use the stock PCV valve and crankcase breather grommets. The grommet pictured is incorrect for the valve cover. With the correct Chrysler or replacement grommet, your current PCV valve, which appears to be Chrysler number 3671076, or similar, will fit...