Been noticing that some of you think that a .060 over 400 would be pushing it? I'm looking at building a 6 inch rod 383 at about 450 HP, is this thing gonna live at this level? To get to 383 ci it would need to be .060 over. Any personal experiences with this 4.185 bore x 3.48 stroke combo?

Thanks!

In my previous observations i've noticed that people like to build the 350 block with a 400 crank, because of 1.Like you mentioned, you will have to go .060 over on the siamese cylinder 400. Where as you only have to go .030 on a 350 block with 3.75 stroke. For 2. When you destroke a motor, it tends to want to rev more, and like the upper RPM. Where as the Positively stroked motors like more torque. This is just previous observations. It's all in what you want to do with the motor. Hope I helped

Just bore it .030 & call it whatever you want.
I don't like .060 over 400's mainly because of the gasket problem between the cylinders if you start leanin on them plus I prefer all the cylinder wall I can keep & I highly doubt 6 cubic inches is going to be a deal breaker :D
Or just put a 3.5" crank in it & you will have 380"s
Just curious but if this is a street deal why do you want to remove cubic inches?? smile.gif

I'm running it now, and i'm having some Brodix track 1s build right not. with stock heads i'm running 12.3's. Runs aboubt 160, 180 in traffic. No Heating problems what so ever.
I'm sure it wont live as long as most lower rev motors, but sure sounds nice reving up that fast! smile.gif
Ed

Mike, this motor will be very limited street and mostly strip, looking at the Pro Racing DynoSim specs, it shows a very optomistic 493 HP @ 6000 (492 @ 6500) and 476 ft lbs @ 4500. This is with a Lunati Solid #40126 - specs 248/260 @ .050 w/ .528/.552 lift. Not sure about those numbers but this software has been very close on our other engine builds. Looking to run low 12's in a 3400 lb 64 Malibu SS. As for streetability it still looks to have 410 ft lbs at 3000 rpms, should'nt be an issue with torque.

Thanks, Brad