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Late to this part but I have ran then out of the box with manifolds, ran fine and had a noticeable power difference. Engine masters just did a comparison. Stealths vs RPM vs TFS.
I have a collection of some flat tappet cams that I picked up over the years that were never used. We can work out the shipping however you would prefer, most likely UPS flat rate box.
Hughes Whiplash (B version) without lifters, includes valve spring and retainer kit. 175.00.00
Crower HDP...
Today installed a new flat tappet into a 383 from a Mopar oriented shop. I noticed 4 of the 16 the plunger look different. They also pumped up just cleaning them with brake cleaner. No holes vs holes in the plunger. What is the difference. All from the same set.
I've installed dozens of these on Mopar and other brands. This is pretty standard really. New wheel Arch's will fit worse, needs to be worked to make it fit right.