Quote:
Originally Posted by PunchT37
I don`t spin engines higher than they make power. I built a 400 PWH engine for a buddies `79 T/A. Stock bottom end. Stock heads with a 60241 Crower cam. I could tell the engine quit pulling after 5200 or so. I twisted it to 5500 a few times. You could tell it wasn`t happy at all there.
I have a 455 with stock rods and TRW pistons also. Larger cam and ported heads. I turn that thing to 5700 to 6000 ALL the time. But, it makes power there also.
So, it`s about the ability to make power at the shift point, then, it will be about the parts strength later. No use building a 7000 rpm capable top end and using stock rods.
I wouldn`t have a problem spinning a 400 with stock rods to 6000 to 6200 or so IF I could make power there.
Aftermarket parts? 7000 to 7500 wouldn`t be a problem for me. We used to turn a 428 with rubber rods to 7000 for years.  Guess we were lucky.  |
Punch,
Isn't the valve train usually the limiting factor? I was taught that if the iron or steel parts are strong enough, ie forged, the whole problem would be keeping control of the valves. As long as the heads are set up correctly so that the valves are under control, not bouncing off the seats or floating, all is well. Is this correct?
Karl
