I have a OF1 and Crower Solids. I have not had any problems with either with the moderate spring pressure Dave built my heads with or the new Crower killer, wiz-bang springs everyone guilted me into pulling my heads to install. With the way I use the car now, the cam is a bit much for me and my first move is going to be to advance it a bit from the 107 originally installed, but ultimately, I think I have too much cam and will be looking to swap someone for a SP1
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi.
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