you may be right. i'll have to look more at the average numbers.

please do and post what you find out for us.

my 408 bored .060 with 12:1 comp would make 373hp/480ftlb tq averaged thru 6500/5500 and the 427 with 12:1 would be 376/491 averaged 6500/5500,so looks like the 427 would be a tad better.

still not enough to make me want to buy a new crank,rods. i really want to move on to the big block gig,but i may just refreshen this small block first,it has about 70 1/4 mile passes and about 40 dyno pulls with about 1500 street miles.
it has served me well.

with Triple Threat. The amount of passes and miles is nothing. Unless there is a problem just drive it and enjoy it.

thats good to here. i'll just drive it and save the money for chassis work.

All this is based on the assumption of using the same cam. In my situation, going to a 4.125 crank from a 4" crank will now allow me to run a bigger cam and retain the same vacuum for street driving. The bigger cam should now help the HP side of the equation. I think this is especially true with motors that are RPM limited due to a hydraulic roller set up.

Yeah, you'll need more cam because assuming the same heads and cam the longer stroke/bigger cube motor would both lower the peak torque RPM and also (as a result) lower ther peak HP rpm as well. Normally as stroke goes up the gap in RPM between peak torque and peak HP RPMs narrows proportionally so you need a bit more intake duration to offset that.

ok,but how much more cam? current cam is 268/272@50-.714/.688 solid roller. would 272/276 with same lift be about right or would it need more? still playin with numbers.

try 276/276 but in 4 degrees earlier so it sees the same closing event as the 272, It should add some power up top but not lose anything measurable underneath.

Stroker 101, when the displacement goes up a larger % than the port area...it's far tougher to get enough air in at high RPM to keep the power high than it is to get it out. A longer exhaust event pretty much goes out the window if there's not enough pumping efficiency up there anyway