Chris you can float valves earlier than 8k depending on how much boost your running, but why not get some BC springs and retainers, they are fairly cheap. $330 and Powerhouseracing
Better question is why take a chance? no one here is gonna buy me a new set of pistons and valves if in the event the tensioner breaks, cam gear slips or belt breaks. I have seen it too many times and would rather stay on the safe side and sacrifice a few ponies. its not like cams and headwork...
Is it possible to go higher in c/r on a 1jz with 264 crower cams (272 large cores) and still keep the motor non interference, or are the cams at the limit of interference?
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