How to prevent lifters pumping up at rpm
Cam is a comp 286H-10 236 @.050" .490" lift 110lsa in an 10.8:1-11:1 .040" 327, cast crank, others forged, heads have 190cc runners 2.02/1.60, full rollers, switched from a team G to a performer rpm.
The cam specs say 2 something to 6,800rpm
When I do a wide open throttle run from about 2,200 or 3k up to 6,400 it just kind of "hangs" there (pedal to the floor) and the rpm start to drop a tad, I just recently noticed this. When I do the WOT run it is down a hill. I'm not positive they are pumping up, but there is no reason it shouldn't spin past that. It does the maybe 2 out of 5 times, maybe it's because of load, but it pulls hard even in 3rd gear. First gear is 2.54, rear is a 3.08 (I know, bad choice with the cam, but it's a driver)
It will spin to 7k without any problems, but every once in a while, it will do this, which catches my attention. It does break the tires loose, maybe by the time 6,400 comes around they are catching traction and holding the rpm's there?
Would overly tightened valves cause this? We did the cold settings per GM manual which is like a 1/4 turn, in the correct order, and we have adjusted them while running.
If I accelerate some what aggressively, it does not do this.
Other than this small issue, it runs really strong. Next cam I buy will be a solid, I thought taking a hydraulic cam past 6k or so was getting sketchy, but I figured comp would stand by their operating range...
The only Mustang I'd ever own is a Fender.
'68 333" Camaro
'14 5.0 Mustang