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Old 08-17-2008, 11:27 PM
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Stock 400 Chevy

Anybody have any majior gripes about building a stock 265hp 400 Chevy Small Block?
I like low speed torque, easy starts, fuel miliage & crisp throttle response.
The engine is going in my 92 S10 with a NV3500 5 speed trans & a Ford Explorer 3.73 posi out back.
Let's hear some opinions out there. Feel free to play devil's advocate , I can take it.

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Old 08-17-2008, 11:29 PM
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Stock 400

By stock I mean 2 Barrel Carb, 1.72 intake Valves, Dish 24cc Pistons, 76cc heads 8 to 1 compression, and low lift/duration (old 929) hydralic cam......
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Old 08-18-2008, 05:16 AM
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welcome....Moving this to the engine forum
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Old 08-18-2008, 05:56 AM
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weak 400 sbc

how about instead you let me have the 400 small block and i'll built it to around 500-600 HP and you can have one of the 4 305's i have sittin in my garage, they all run. Hell i'll give you 2 305's for the 400, just to keep it from going to waste, please make some mods and get some use outta that motor or sell it so someone else can. I've got an 02' trailblazer w/ a straight 6 that makes 270hp, i'm sure you could find one of those at a salvage yard. just PLEASE don't waste a good 400 sbc, I've been looking for one of those for almost 10 years, and it never fails. when i have the money i can't find one, and when i'm broke they're everywhere.
Danny
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Old 08-18-2008, 07:19 AM
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SBC 400 & fuel mileage??
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Old 08-18-2008, 08:22 AM
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Quote:
Originally Posted by SSedan64
SBC 400 & fuel mileage??

Kinda my thoughts too! LOL A 265 and a 2bbl maybe, but a 400 is just not fuel friendly!

Mark
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Old 08-18-2008, 08:38 AM
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I would not run a 2bbl if you want mpg. Use a 4bbl q-jet (very small primary's).

I would not use a stock cam in any old school sbc. Use at least a Compcam 246 or 252H.

Your 5 spd will not like the 400 torque.

That 3.73 is way too much gear for a stock or even a mild cam. You will need a 3.08 gear with OD to get good mpg with a sbc.

A 400 will be a tougher fit in a s10 due to the externally balanced 168 tooth flywheel and large 8 inch balancer. A 350 can use a neutral balanced 153 tooth flywheel and a 6 inch balancer.

I recommend that you build a mild 305, 327, or a 350 (best choice). Sale or save the 400 for another project.
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Old 08-18-2008, 11:14 AM
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I love the replys, & here's my opinion.
ENGINEERS that worked at GM in the late 60's designed the 400 to run with a 2 barrel carb & low lift cam. Why do we all think we know more than the guys that INVENTED this engine???
I know they can make 500 hp, but fuel consumption escalates dramatically.
Plus when you take the engine past 85% volumetric efficiency reliability also decreases. (Low hp engines just don't stress the parts as much)
I'm not looking for 25mpg, but I don't want to spend $1000 building 8mpg, that belongs more on the drag strip than the street.
I wont build anything smaller than a 355. I personally own 5 400's and 8 350's. I'm willing to admit that it in itself is a touch eccentric...
I want to drive this thing whenever I want & there will be an occasion that I don't want to pop the hood.
I've been obsessed with the sbc for over 20 years & I've got all of the "race" builds out of my system & would like to build a grandpa motor.
Mostly because I would have the only one.
I can't find anyone who has left one of these engines stock.
A new 406 with 8 to 1 compression, 2 barrel carb, HEI dist, small port heads with 1.72 intakes, & dual exhaust, in an S10 with a 3.7 posi & manual trans, will give new meaning to the term "Low Speed Torque".
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Old 08-18-2008, 11:19 AM
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Quadrajet vs Dualjet

There's only 1 reason I wouldn't run a Quadrajet on this engine.
Dualjet cfm rating - 287cfm
Quadrajet cfm rating - 750 cfm
The quadrajet makes scense until you open the secondaries & then all gas goes out the tailpipe. And I don't know about the rest of you, but frankly I can't drive a vehicle like this without stabbin the gas a little...
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Old 08-18-2008, 11:22 AM
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Quote:
Originally Posted by eatonde
how about instead you let me have the 400 small block and i'll built it to around 500-600 HP and you can have one of the 4 305's i have sittin in my garage, they all run. Hell i'll give you 2 305's for the 400, just to keep it from going to waste, please make some mods and get some use outta that motor or sell it so someone else can. I've got an 02' trailblazer w/ a straight 6 that makes 270hp, i'm sure you could find one of those at a salvage yard. just PLEASE don't waste a good 400 sbc, I've been looking for one of those for almost 10 years, and it never fails. when i have the money i can't find one, and when i'm broke they're everywhere.
Danny
I wouldn't give you $80 for 4 305's. You'd have to give me about 20 of them (delivered by you) for me to consider the trade.
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Old 08-18-2008, 11:26 AM
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Quote:
Originally Posted by Jmark
Kinda my thoughts too! LOL A 265 and a 2bbl maybe, but a 400 is just not fuel friendly!

Mark
It's not friendly compared to the new Insight, but I think 14mpg is within reach. 14mpg, 280HP, 410TQ....
265's have no provisions for oil filters, & lack motor mount bosses on the block... Cmon!
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Old 08-18-2008, 11:29 AM
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Quote:
Originally Posted by jbvcw71
I love the replys, & here's my opinion.
I personally own 5 400's and 8 350's. I'm willing to admit that it in itself is a touch eccentric...
If you have 5 buildable 400's, that's about 5 more than most guys have! LOL I have one and came across it through my son's work. For most of us, finding a good, buildable 400 is a crap shoot. There just aren't that many left out there to be had.

Yes, you can build a low comp 2BBL 400 and do fine. But for most of us on here, finding a good 400 is a real goody!! That's why so many suggested saving it for a hypo build. If you got it and want it, go for it!!!

Mark
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Old 08-18-2008, 11:34 AM
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Quote:
Originally Posted by jbvcw71
It's not friendly compared to the new Insight, but I think 14mpg is within reach. 14mpg, 280HP, 410TQ....

I'm not sure you can get 280hp and that torque out of an 8:1 2BBL 400. Maybe 165hp???? But what the heck, give it a shot and let us know how it comes out. I remember the '70 Monte with the 2BBL 400. Kinda a wheezer engine but it did run good, but I doubt they were anywere close to those numbers you are looking for. Just my old memory talking, I could be wrong.

Mark
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Old 08-18-2008, 11:57 AM
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Why do we all think that we know more than the engineers from GM in the 1960's???

50 years of experience and the free exchange of information (internet)...thats why.

Your average grease monkey probably does know as much or more now than those guys did then.

The just had to make it work, it doesn't mean they did it right.
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Old 08-18-2008, 12:44 PM
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If you're really serious about getting the most gas mileage. Use the newest most efficient combustion chamber design like the Vortec heads. This would be better than the old bathtub chambers & tiny valves. Reverse dome, D-shaped dish pistons with around 9-9.5 C.R. and the smallest QuadraJet or 2-Barrel VaraJet or DualJet with a small cam like one of the CompuCams mentioned above. If you're worried about stabbing the QuadraJet fast peddle just disable the secondaries.
My 98Z71 4WD LongBed gets 17-19MPG/Hwy, my friend has a 91Chevy 2WD ShortBed with TBI and he gets at most 17MPG/Hwy. My engine has Vortecs his has the Bathtub swirlports. Not to mention mine is 4WD+1000lb heavier.

Last edited by SSedan64; 08-18-2008 at 02:26 PM. Reason: Spelling
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