Thread: 350 crank in 400 block

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Has any one on this list put a 350 crank in a 400 small block ?
If so is it better than using a 400 crank ?
I am using the motor for street use and want good millage .

Originally posted by ron 52
Has any one on this list put a 350 crank in a 400 small block ?
If so is it better than using a 400 crank ?
I am using the motor for street use and want good millage .

Ron,
DON'T DO IT.. That is a high RPM hp engine combo. What
I mean by that is it doesn't start making power until your in the
upper RPM range. That would suck on a street engine because
you would have low bottom end torque which is what is needed
for the street. However, with the right gears, high stall or
manual gearbox, and a light vehicle, a 377 will scream. But for a
street motor it sounds like you have a 400 you could build. I
would make that a 406 with a 0.030 overbore and at least
a 5.7 rod torque monstor. You can get order a kit that has a
better cast crank, good rods, and pistons and rings for under a
$700 and have an awsome street motor. Or if your on a tight
budget you could rework stock 350 rods with ARP bolts and
and honed pretty cheap at your machine shop. Then just order
piston for the 406 with 5.7 rod. Throw on some decent heads
vortec and have a killer torque monstor.

Second what camaro fever said. Have built many 377 combo's for circle track stuff, don't recommend for every day street driving. You will be much happier with the 406!!

Chris Laarman
Ottawa Engine and Performance
www.ottawaengine.com

I don't totally agree with the other two posts that the 377 is a high rpm engine. It can be built that way and performs great in the upper rpm range when built to do so. Really though it's just a big bore 350 and will perform like a 350 in the lower rpm range if cammed to run there.
I do agree that for the street a 400 crank in the 400 block or in a 350 block is better suited due to the increased torque. You would be happier with the increased stroke.

there is no replacement for displacement.

Originally posted by firebird77clone
there is no replacement for displacement.

EXCEPT,15 LBS. OF BOOST OR A 250 SHOT OF N20.I THINK THIS MIGHT OF BEEN POSTED BEFORE.