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Jonnylightening said

Im not disagreeing at all, all im bitching about is how can I break a cam in with cheap Summit lifters change nothing else but to Howards and flatten lobes? I ran the car 2000 miles with the cam and summit lifters that were in it. Only reason I changed out was for piece of mind, Howards were supposed to be top quality high performance good for higher RPM revs. All I know is Im done with anything flat tappet.

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And ain't saying you should not be unhappy, OP. What we don't know is if those lobes were already damaged and the Howards just finish it off....

Now YR's point on the lifters not rotating is a very good one. Story time: We had a virgin block to work with and found that 4 of the Crane supplied lifters were tight in the bores. So we wrote back to Crane and asked if they could measure some and find some smaller than .***" diameter due to the unusual block situation. They seemed happy to oblige and the smaller ones were in the mail 2 days later.

So, the Howards lifters could have been on the high end of diameter tolerance and been a bit too snug in 4 of the bores.

FWIW, everyone should make the effort with flat tappets to

• Mark the lifters
  
• Turn the engine over 4 times when assembled
  
• Check to see that each lifter has rotated, at least a little bit; they will rotate at different rates.

Yeah, does not fix the op's engine now....