Anyone run a 352 or 377 SBC ?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 02-01-2007, 10:53 PM
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Anyone run a 352 or 377 SBC ??

I know there is no replacement for displacement.
Heard a lot about the the 352 or 377. Haven't seen one in several years.

Anyone have any input as per useage, power, etc. besides NASCAR?

Certainly the 383 is easier to build, and readily available.

thanks,
x

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Old 02-02-2007, 02:52 AM
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id like to know too, i have a 400 block i wonder what a 377 would be like on the street?
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Old 02-02-2007, 03:10 AM
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If I had a good 400 block laying around, I'd try the 352, just so I could say I had a Chevy 352. And also it'd get this dang 307 crank out from under my feet.

Wonder if I could change my fender emblems to say 352???
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Old 02-02-2007, 04:12 AM
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is the 307 crank journal the same as a 350s?
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Old 02-02-2007, 07:28 AM
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377"

Yes, I have one in a boat, its a 4 bolt with a CROWER (0024200 cam, 9:5-1 compression, RPM Air gap, 750 Eldebrock, Mallory dist., MSD 6A, early FI. heads that are port matched, bowls and combustion chambers cleaned up and polished, 1:6 roller tipped rockers, and balanced... This motor is brand new, so don't yet know how well it will perform, but it feels good and planes instantly in initial runs to put some time on it...but I have a friend with a 1970 Vette roadster, who built one with a 4-71 blower... IT HAULED !!! ..I understand the advantage is that they will rev due to the shorter stroke, that is why I used it because I am looking for mid range to top end as I can't use the bottom end due to prop size limitations (tire size).... But if you use a blower or NOS you MUST o- ring the block or heads !!!
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Old 02-02-2007, 08:01 PM
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Quote:
Originally Posted by runn141
is the 307 crank journal the same as a 350s?
Yep.........
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Old 02-02-2007, 08:16 PM
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355 here

heres my 355
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Old 02-02-2007, 11:50 PM
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Quote:
Originally Posted by cabowabo
heres my 355

A 355 and a 352 are two very different animals. Mouse motors that is.....

325, 352, 377 are built on a 400 block. NASCAR uses a 352.

I have never even heard of anybody with a 321/325.
Probably because there are/were no classes with that cube limitations.

3 inch stroke in a 400sbc?

Last edited by xntrik; 02-03-2007 at 12:01 AM.
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Old 02-03-2007, 01:38 AM
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A bud built a 377 street blower motor. Runs very sweet. In excess of 500hp on 6-7psi boost (B&M162). Bullet proof reliabilty.

377's (400block w 350crank) is actually less work than building a 383 cause you don't have to clearance the block for 5.7" rods. Or clearance the rod bolts to clear the cam lobes.

U use special readialy available main bearing spacer inserts to make up the difference in main bearing journal diameter. Other than a balance job on the crank. Its a bolt in.

The larger 400 sized bore allows the cylinder head to breath better. Makes for a strong motor that likes rpm and can take it.
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Old 02-03-2007, 08:31 AM
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377

so...to build a 377, u use a 350 crank, 350 rods?, and special pistons or ??
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Old 02-03-2007, 02:56 PM
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yep

yep, that is what you use, but on mine I only bored it to .020 over, just in case I ever wanted to re-bore because .040 is the safe limit ON A 400 BLOCK..

Last edited by handsome harv; 02-03-2007 at 03:01 PM.
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Old 02-03-2007, 02:58 PM
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Nothing speacial about the pistons. Most piston makers supply them. This is the same piston that you use on a 400rebuild if you're using the shorter 5.565" factory 400 rods and 3.75" 400 crank.

3.48" crank 5.7" rods

3.75" crank 5.565" rods piston same same
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Old 02-03-2007, 03:05 PM
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For your main spacers use a set of 400 .010 bearing and set your 350 mains over them works as good as the aftermarket spacers or the high dollar speical mian bearings.
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Old 02-03-2007, 04:07 PM
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I had a 3.295 stroke 4.155 bore 358 (made 608 hp @7900 RPM, 460 ft lbs). I really dont see any benefit to a motor like this in a drag or street car. It ran well for the size, but it would have been faster and more fun to drive if it were a 406. On top of the fact that the 406 would have been faster, it would have been more reliable in that the max RPM would have been less, and there would have been less of a tendency for valvetrain problems.

Adam
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Old 02-03-2007, 08:35 PM
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352"

Back in the 60's, i had a friend that ran a 55 chev and it ran 10.30 @ 130 on a small block that was a 352" HILBORN injected chev, i know it was stroked with a REATH AUTOMOTIVE" crank ...thats all i remember
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