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Old 11-08-2004, 06:25 PM
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Sbc 377

what are the pros and cons of destroking a 400 to a 377?

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Old 11-08-2004, 06:53 PM
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Slightly reduced piston speed is about it
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Old 11-08-2004, 07:22 PM
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uhh, parts cost more for the 377 and a 400 would hand your butt to you?

That's about it

K
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Old 11-08-2004, 07:30 PM
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Higher revving capabilities but its hardly worth losing the 23 cubic inches. Most engines will never see the RPM you gain by destroking it.
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Old 11-08-2004, 10:27 PM
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In most applications I would take the cubic inches. Not that a 377 is a bad engine but, for a street car I would take the 400, for a drag car I would take the 400. The only place I would take the 377 or a 400 is in a sustained high RPM type of vehicle.

Now if you have a good 400 block and a good forged 350 crank sitting around by all means buid it. I would if the parts were in hand.

Royce
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Old 11-09-2004, 12:41 AM
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If I were to destroke my 400, I would go with a 350. It is a 400 block with a 327 crank. There was a Hot Rod article about it called. "The 350 Chevy Should Have Built". It nets the best SBC rod ratio, it gets better gas mileage, and you can run higher compression safely. I bet it would make a significant amount more power than the 377.
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Old 11-09-2004, 04:58 AM
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I had a 377 in a Chevelle one time and loved the way it reved. Lots quicker getting the rpm's up than even a 383, but Ive never had a 406, so I cant give comparisom, but I liked the 377. HG
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Old 11-09-2004, 08:29 AM
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lluciano77,
The 347 (if I remember right) 400 block with 327 crank is a good engine as well. I know a guy that ran pretty hard with one. I would still take a 377 over it, for the simple reason of cubic inches. Now if I was racing in a class where 350ci was the limit then I agree the 347 would be the way to go.


HemmiGremmie,
A 377 does rev better than a 383 but, you are giving up torque down low. You typically just don't need to rev a 383 because it makes so much torque. Where do you want to make your power?


Like I said before it all depends on the combination and the use/vehicle. A case can be made for almost any engine out there. Without knowing the application we are not going to be able to give any educated advice. Too many factors are missing, what kind of vehicle?, how much does it weigh?,what's the intended use?, gear ratio?, automatic or manual?, stall?, etc...

Royce
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Old 11-09-2004, 03:36 PM
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We just solve the whole reving and tourque problem with big ole blowers, dont we Camaroman? LOL HG
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Old 11-09-2004, 05:17 PM
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LOL, HG

It works for me.

Royce
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Old 11-09-2004, 08:18 PM
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Here is a link to the article:

http://www.purplesagetradingpost.com...%20engine.html

Quote:
Originally posted by camaroman7d
[B]lluciano77,
The 347 (if I remember right) 400 block with 327 crank is a good engine as well. I know a guy that ran pretty hard with one. I would still take a 377 over it, for the simple reason of cubic inches. Now if I was racing in a class where 350ci was the limit then I agree the 347 would be the way to go.[b/]
The 27 extra cubes can't compete with the improved rod ratio, and cylinder fill. The 350 will use its cubes more efficiently.
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Old 11-09-2004, 11:58 PM
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lluciano77,
I read the article when it came out. This is not a new combination. I would still take the 377 over the 347. I would take the 347 over a standard 350 though. Just personal opinion, to each their own. In a street car I would take the 383 over either one.

Royce
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Old 11-10-2004, 12:43 AM
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Quote:
Originally posted by camaroman7d
lluciano77,
I read the article when it came out. This is not a new combination. I would still take the 377 over the 347. I would take the 347 over a standard 350 though. Just personal opinion, to each their own. In a street car I would take the 383 over either one.

Royce
Yeah really, why do people keep bringing up that article and thinking that motor is so special?! It really didn't do that much better than any other motor with a 1200 dollar set of heads and an expensive roller cam!

Case in point proving that that motor didn't really do anything that great at all:
http://www.ryanscarpage.50megs.com/combos2.html


Check out combos 12-14. THat same combo that was used on the "should have been built" 350 is put on a normal 350.

The compression on the normal 350 is lower, it uses the same 1200 dollar set of CNC heads, the same roler cam and guess what? It makes about 35 more pounds of torque and about 15 more horse than this "magic" motor that we always seem to bring up. I might also add that with the same damned setup, the normal 350 made its HP about 1000 RPM sooner than the magic motor did.

For more ammo on how that motor got owned, right below it is the similar setup on a 383 (very similar in cubes to the 377 we're talking about). Made about another 30/30 horse more.

Can we put this stupid magic 350 away now? Its not that great.

K
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Old 11-10-2004, 08:50 AM
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Killer,
You crack me up!! Good info though and I agree. The "magic" 350 is a RPM engine. It is basically and over growm Chevy 302, just about the same bore/stroke ratio. Not that it's a bad engine, it's just not as great as the article made it out to be. In a 350 or under cube racing class it might be worth the effort (expense) if you need to run sustained high RPMs.

Royce
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