Quote:
Originally Posted by Skip Fix
Darby check them all. I have a box of new Manley Nex Tek springs that are all over the place by 15%-some cheaper Howards for another roller all right on the button withing 1-2%. Also when I went to flowbench a friend's stock RAIV head that had been running fine I found 4 broken inners. Having a spring tester WITH a dial indicator is the only way to get accurrate results-even the scaled ruller on the side of the Rimac is hard to get exact.
Cliff I realize these are aggressive lobes and what you are doing why the 130 is probably too light-might not need 280. But 150-170 would not be a bad goal.Maybe even 200.
Also as many folks have found stiff springs and many motors pull more rpm well.Soem folks have even found keeping the HR with stiffer springs they can spin higher just fine. Again check with Lynn where his rpm peak went with better springs.
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Skip
I can't check them all, How would I keep the valves from falling out into the cylinder then, the heads are on the car, so pretty much impossible unless i bought all new springs again! The guy used a valve height micrometer and set it to my 1.75 on the machine, then put my spring and retainer in.
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Darby
74 Grandville 2Dr 455 c.i 4550#
2011 1.60 60 ft,7.33@94.55-11.502@117.74
2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32
M/T 275/60 ET SS Drag Radial
2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's
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