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Chevy 377 motor Vs 406

Articles about swapping engines and anything related, mounts, exhaust considerations etc.
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Chevyonbillets
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Chevy 377 motor Vs 406

Postby Chevyonbillets on Sun Jul 04, 2010 12:27 am

I was chatting with a old friend about a few engine builds that I have pending , I have a 400 block with two freeze plugs on
each side , stander bore . So I ask him what about putting a chevy 350 crankshaft in the 400 block we both were :?: :?:

SScamino
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Re: Chevy 377 motor Vs 406

Postby SScamino on Sun Jul 04, 2010 1:59 am

cubic inches wins everytime!!! dont bother going through the trouble of a 377 and destroking a perfectly good 400 spend that money on a good set of heads and make 500 hp now!
1981 El Camino SS. 355 cubic inches of small block Forged bottom end, slightly worked Vortecs, xe274 cam, Built Dr. Speeds TH350 with a 2800 stall and 3.73s
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dogshit
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Re: Chevy 377 motor Vs 406

Postby dogshit on Sun Jul 04, 2010 10:19 am

I suspect you already know its all about application. 377 is generally better for a well geared light race car or a light drag car. For about everything else a 406 is better hands down. RPM = ruins peoples motors. Why spin the snot out of it if you can make the same HP and more torque down (more stroke) in a more useable rpm range and an rpm range that your engine can live a much longer life with. More cubes is more torque which is almost always a good thing. For a (relative) heavy street car the benefits are more and deeper than I want to list.
In the muscle car era if it had a small block it was your moms car. When you turn your car on does she return the favor? Life's short enjoy your ride. Hybrid burns gas & rubber. Check out my photo album.

87 Olds 442, Blue on Metalic Silver with 275/60/15 drag radials on 15x8 442 wheels, 10-1 509ci Cadillac, 800cfm Q-jet, Performer intake, Street ported heads, 230@50 518 lift cam, Headers, Built 200-4R, 2800 stall lock-up converter, Electric fans & in-tank fuel pump, Factory AC, All factory guages work including tach & oil temp with the 509, Functional Hurst hood & rear spoiler, 36mm hollow sway bar, 3.42 posi 8.5, 17.0 mpg hwy, sold :(

87 Buick Grand National, Tuxedo Black w Chrome 275/50 drag radials on 15x8 GN wheels, 231 Buick V6, TE-60 turbo, Stretch intercooler, 42.5lb injectors, 3" downpipe, 3000 stall lock-up converter, Meth/water injection, 3.42 posi 8.5, 22 mpg hwy, original owner ~ Goal for both cars 11.8 ETs / 115 mph in the quarter reliably on pump gas

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Chevyonbillets
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Re: Chevy 377 motor Vs 406

Postby Chevyonbillets on Sun Jul 04, 2010 12:37 pm

SScamino wrote:cubic inches wins everytime!!! dont bother going through the trouble of a 377 and destroking a perfectly good 400 spend that money on a good set of heads and make 500 hp now!


Thank's , I will start looking for a good 400 crankshaft, I have srp pistons 30 over with eagle H beans rods 5.7 just waiting for me to put a good crank on that block. I have a stock 400 crank but i seen people running those cranks and they break at the damper pin side .

84cutlass454
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Re: Chevy 377 motor Vs 406

Postby 84cutlass454 on Sun Jul 04, 2010 3:33 pm

the 400 all the way is my favorite sbc good heads and intake and cam is 500 horse power with ease hear let me show u its got scat forged rods and crank keith black pistons 12.8.1 comp and dart pro 1 heads and a 850 dp the thang is a torque monster go with the 400 u wolnt be sry . Image

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86Cutlass383SR
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Re: Chevy 377 motor Vs 406

Postby 86Cutlass383SR on Mon Jul 05, 2010 12:08 am

Chevyonbillets wrote:Thank's , I will start looking for a good 400 crankshaft,


Why? Why look for a good 30+ year old crank?

http://www.summitracing.com/parts/ESP-104003750/

This is a brand new stock replacement crank with 400 2.65 mains for $169.95 + shipping. And this is better than any 400 GM crank you will find. Better materials.

And I agree, a good torquey 400 will be better than a 377 for most anything. Unless you're looking for an 8000 rpm strip motor that you plan on rebuilding every season ...

Wish I could find a good 400 block. I'd be building a 420 ... but, since you already have the pistons, I'll let ya slide ... LOL
Doug Gulley

86 Cutlass, 383 been rebuilt...needs installed, AFR 190, Accel SuperRam, 30# SVO inj, 58mm tb, AFPR, aftermarket T56, 17x8.5" Rondell #58's, C5 brakes, *under construction*

Planned upgrades*** 245/45 tires, LS1 rear discs, rear suspension upgrades, etc...etc...

Got Torque???
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jrm81bu
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Re: Chevy 377 motor Vs 406

Postby jrm81bu on Mon Jul 05, 2010 2:44 pm

86Cutlass383SR wrote:Wish I could find a good 400 block. I'd be building a 420 ... but, since you already have the pistons, I'll let ya slide ... LOL


I got two of them...... :D

How bad you want one?
81 Malibu
400(350 for now) 142 supercharger
700r4
3.73 posi 7.5

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86Cutlass383SR
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Re: Chevy 377 motor Vs 406

Postby 86Cutlass383SR on Mon Jul 05, 2010 10:37 pm

jrm81bu wrote:
86Cutlass383SR wrote:Wish I could find a good 400 block. I'd be building a 420 ... but, since you already have the pistons, I'll let ya slide ... LOL


I got two of them...... :D

How bad you want one?


If you'd told me about it before I had my 383 rebuilt ... but now that it's done ....

(sigh) pipe dreamin again ...
Doug Gulley

86 Cutlass, 383 been rebuilt...needs installed, AFR 190, Accel SuperRam, 30# SVO inj, 58mm tb, AFPR, aftermarket T56, 17x8.5" Rondell #58's, C5 brakes, *under construction*

Planned upgrades*** 245/45 tires, LS1 rear discs, rear suspension upgrades, etc...etc...

Got Torque???
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Chevyonbillets
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Re: Chevy 377 motor Vs 406

Postby Chevyonbillets on Tue Jul 06, 2010 8:54 pm

84cutlass454 wrote:the 400 all the way is my favorite sbc good heads and intake and cam is 500 horse power with ease hear let me show u its got scat forged rods and crank keith black pistons 12.8.1 comp and dart pro 1 heads and a 850 dp the thang is a torque monster go with the 400 u wolnt be sry . Image



I like your set up bud

84cutlass454
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Re: Chevy 377 motor Vs 406

Postby 84cutlass454 on Wed Jul 07, 2010 6:56 pm

thank you the 400 will make u a happy camper and she run like a champ its got some awsome power


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