377 sbc in a 1st gen - LS1TECH



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377 sbc in a 1st gen

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Old 04-23-2007, 03:24 PM   #1
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Default 377 sbc in a 1st gen

fellas i need a little advice here from experienced guys or anyone who has tried this setup. im building a 377 sbc which is a 400 with a 350 crank, i love the setup alot of guys have said its a damn good setup good for 600hp n/a. but my goals are very high with this engine. i know they make all their power at 7500 rpm and very little down low. but i was thinking of adding like a whipple supercharger on it instead of a procharger or turbo since i will already be making power up top. i just need the best of both worlds down and high power. i know whipples start making power at 2000 rpm, so my question is will this setup get me at least 800hp and good power throughout the power band? i know i set my goals pretty high but i believe i can do it i just need feedback. thanks
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Old 04-23-2007, 03:47 PM   #2
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What kind of a budget do you have for this project? What (besides 800hp) are the goals for the motor?....is this a dedicated track car? Need more info. If I were after 800hp, I'm not sure a 377sbc with a blower would be my plan of attack.......
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Old 04-23-2007, 05:35 PM   #3
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No replacement for displacement. I say if you have the 400 block, build a 406 or 412, don't give up the extra cubes!
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Old 04-23-2007, 11:31 PM   #4
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street strip car. i have heard those 377s are gentle under the revs but at WOT and up at 7k they scream. and seeing as how they mainly make power up top and a twin screw supercharger should get the torque going from a launch
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Old 04-24-2007, 02:05 AM   #5
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i just think this combo would be ideal since u have power up top and down low grunt as well. power throughout the band thats what i want!!!!!!!
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Old 04-24-2007, 04:39 PM   #6
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Quote:
Originally Posted by gangbang malloy
i just think this combo would be ideal since u have power up top and down low grunt as well. power throughout the band thats what i want!!!!!!!
Why not keep the RPM's low?

RPM is what kills bearings and Valve Springs, to make it to 7500 rpm your going to have to make it a solid roller motor and have huge flowing heads.

Go with bigger cubes, keep the rpm's low, and add the power adder. if your worried about being MPH limited because of the 400 trans put a taller gear in the rear, or get a gear venders OD unit.
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Old 04-24-2007, 05:11 PM   #7
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I don't know that I will ever see a better engine than my 406 was. Maybe some as good but it had everything, low end, top end, torque, it was awesome.
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Old 04-25-2007, 04:37 PM   #8
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with the block made for high rpms do u guys think this setup would be great and effecient? what would this setup be good for output wise?
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Old 04-25-2007, 05:13 PM   #9
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Hot Rod or Car Craft did a comparison a few years ago on the 3.48 stroke vs the 3.75 stroke motor, holding the cubic inches constant. The test was analogous to the 377 (350 crank in a 400) combo your reffering to, vs a traditional 383 (400 crank in 350). If I rememebr the horse power and torque differences varied very little engine to engine. Go with a long rod 406 and you will have more power across the entire rpm range.

Personally, Ive been using the 3.875 cranks and doing the 421 motors lately, not quite as hard on the cylinder walls as the 4" stroke crank and more cubes than the 3.75.
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Old 04-26-2007, 04:37 PM   #10
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anyone had any good experiences with a whipple on a carb engine?
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Old 04-30-2007, 06:05 PM   #11
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any whipple guys in here?
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Old 05-08-2007, 05:48 PM   #12
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Quote:
Originally Posted by gangbang malloy
fellas i need a little advice here from experienced guys or anyone who has tried this setup. im building a 377 sbc which is a 400 with a 350 crank, i love the setup alot of guys have said its a damn good setup good for 600hp n/a. but my goals are very high with this engine. i know they make all their power at 7500 rpm and very little down low. but i was thinking of adding like a whipple supercharger on it instead of a procharger or turbo since i will already be making power up top. i just need the best of both worlds down and high power. i know whipples start making power at 2000 rpm, so my question is will this setup get me at least 800hp and good power throughout the power band? i know i set my goals pretty high but i believe i can do it i just need feedback. thanks
The stock block will go BOOM fast like that. A 406 is a wonderful engine... as long as it's not the GM block.

It sounds like a budget build turbo setup woud fit this bill, and would not require the solid roller valvetrain for 7500 RPM.

Ben T.
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Old 05-09-2007, 06:54 PM   #13
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i'm curious why you dont just keep the 400 crank. i'm not sure as to what rpm level they make their best power at but i would assume 400-406 would work good. what is with this fascination with de-stroking? really i want to learn about this setup.
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Old 05-10-2007, 10:17 AM   #14
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Quote:
Originally Posted by LSWaaa?
i'm curious why you dont just keep the 400 crank. i'm not sure as to what rpm level they make their best power at but i would assume 400-406 would work good. what is with this fascination with de-stroking? really i want to learn about this setup.
The combination of the larger bore and shorter stroke make for a motor that likes to live at higher rpms, 7000+. The trade-off is that shortening stroke also takes away torque, especially from the lower end.
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Old 05-28-2007, 09:02 PM   #15
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Quote:
Originally Posted by jmm98LS1
The combination of the larger bore and shorter stroke make for a motor that likes to live at higher rpms, 7000+. The trade-off is that shortening stroke also takes away torque, especially from the lower end.

which in turn may make launching easier on the drivetrain, not worried about that really though, i just want something that isnt really common and a v8 that revs that high would have i distinct sound wouldnt it? have any of u guys heard a 377 at 7500 rpm? now add the killer whine of a twin screw and im guessing that would sound wild and perform nicely
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Old 05-29-2007, 12:48 AM   #16
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if you got the money for the valvetrain to go along with those rpm's i say go for it, but it would be much cheaper to build more power with more CI.
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Old 05-29-2007, 02:52 AM   #17
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anyone here had any experience with this 377 small block? i need some feedback guys so i can weigh out the positives and negatives
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Old 06-06-2007, 10:28 PM   #18
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Wouldn't a 377 have just as much grunt as a nicely built 350, but less torque than a 400? I would think that the 377 would be a good compromise between the 350 and 400.
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Old 06-07-2007, 01:14 AM   #19
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from what i have seen a 377 makes really nice power kinda like a 400 or 406 block but little torque kinda like 750hp with 520lbs ot torque, now thats where one would put a twin screw supercharger to make that low end grunt and get it to its more desired rpms. i just wanna see if someone has done it or something like it
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Old 06-29-2007, 12:21 PM   #20
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I just built a 377 for my old nova. Im quite interested in seeing how this setup will run. 4 bolt 400s are actually weaker than 2 bolts mains so I would recommend a splayed 4 bolt setup if you plan on keeping the revs up. Valvetrain is also very important if you wanna make good power.
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1st, 370ci, 377, 377sbc, 700, bore, build, chevy, gen, horse, power, sbc, screw, stroke, supercharger, twin

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