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post #1 of (permalink) Old 12-23-2002, 07:36 PM
nicotine
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rebuild or not??

here is the question currently i have a sb 400 in my 77 chevy basicly stock. should i rebuild it to have power and torque or should i drop a 327 i have in the shop that is out of a 66 vette with 330hp and i am not sure how much torque. what should i do?
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post #2 of (permalink) Old 12-23-2002, 10:20 PM
**DONOTDELETE**
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Re: rebuild or not??

Rebuild the 400. Those 400 motors are sweet and getting rare to find these days. You'd get more torque from the 400 and I would think more HP too if you chose the right cam/pistons. I've never been impressed with the 327's torque but they are a quick revving engine great for cars such as the vette. I had a 327 in my old 80 GMC k20 and it was a dog in that truck. RPM's had to be really high to get some power.

It's kind of funny you brought this up. Was talking to Jay (dynoshop owner) and he had a freshly rebuilt 327 on the floor wrapped up in plastic from the machine shop. He asked if I wanted to buy the 327 and I said, "no, but if that was a 400 I might consider". He said, "hell, if that was a 400 SBC, I wouldn't even be selling it...." [img]images/graemlins/smirk.gif[/img]
post #3 of (permalink) Old 12-23-2002, 11:31 PM
 
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Re: rebuild or not??

rebuild the 400 i have driven my share of them and the are better than a 327 any day,check your spec's on the 400
and the 396 and they are about the same.Big block in a small block package
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post #4 of (permalink) Old 12-24-2002, 02:40 AM
nicotine
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Re: rebuild or not??

arent all 400's 2 bolt main though. what are the pros if any and the cons of this?
post #5 of (permalink) Old 12-24-2002, 04:58 AM
 
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Re: rebuild or not??

Thyre are some 4 bolt main 400's but they are actually weaker because of the location on the outer bolts, it removed material from a bad spot. So a two olt main will be fine. I have a 4 Bolt main 400 in my basment im gonna built to 10:1 comp, vortec heads, roller cam, balanced and blueprinted and it should have almost 500 Lb Ft of torque @3000 rpm. and over 450 from 2000-4500.
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post #6 of (permalink) Old 12-24-2002, 09:21 AM
 
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Re: rebuild or not??

no there where two blocks that where 4 bolt mains
casting #'s 3951509 70-71 but this block was 2-4 bolt
you knew it was 4 bolt when you dropped the pan
and # 3951511 was the 4 bolt main 70-73 the 4 bolt main
is alot better motor because of the stress that they can
handle i will only rebuild 4 bolt mains my self but all the
400's are worth rebuilding,but they need to be bored for them
to be rebuilt right and have the heads checked for cracks
and if there are any, only replace them with 400 heads
350 heads will work if you have the steam holes drilled
but they still are not 400 heads
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post #7 of (permalink) Old 12-26-2002, 02:13 AM
nicotine
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Re: rebuild or not??

are the heads off the 327 vette engine better are they interchangable with the 400?
post #8 of (permalink) Old 12-26-2002, 06:55 PM
 
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Re: rebuild or not??

if the motor is a old as i am!! there should not be bolt holes
in the heads so they won't work for your acc's, power steering
a/c or alt. and if the holes are in the heads you will still have
to drill the steam holes in the heads,and the only way i could see them being any better is they have 202 valves.
hope this helped you
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