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.  |
+1. I had a 455 in the car with a smaller comp cam and the car only made power to like 4800. With the HR camshaft that I have in the car now on a 112 LSA and ported heads, the motor will pull really hard at 6300rpms, but I didn't want to destroy the bottom end so I kept it there.