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molevolent_creations 01-24-2004 10:47 AM

377 sbc in a truck
well its about time to start bying stuff for this engine, so i thought i would repost...
i just rebuilt my trannssmission and its pretty sweet,
ill refresh you guys with my set up...
1990 chevy silverado
400 sbc destroked to a 380
its got a 0.40 bore
aluminum brodix heads
gear drive set
9.5:1 compression
stock cam- stock intake-stock rear end gears,stock quadjet

what i need to know is the right set up for my stock stuff.
im thinking a 2500-3000 stall.
4.11 gears or 3.73...leaning towards 4.11
and edelbrock air gap intake
and a holley 750

the cam thing is one of the main things i need help with, i dont really get the lobe sizes and stuff.

i had theses iszes sugjested before

around 220-230 duration at .050

Comp Cams xtreme energy 288 HDY roller, 288/294 @.050 236/242 .520/.540 110

cam in the 240's int. 250'exh @.050 .550 lift range and a 106 or 108 Ls angle

also would like to know a good tire size..

thanks brian

killerformula 01-24-2004 11:42 AM

What kind of truck are you talking about? This is definitely not going to be a daily driver right?

The first thing I thought when I heard 377 is that it's not the greatest motor for a truck, you'd be better off sticking with the stock 400 or 406 so you can take advantage of the torque. YOu can spin that motor up to 6000 without problems. Generally destroking is only done when you have to do it and its done for a light vehicle that spins really high RPMs (probably 7000+).

What are your goals with this truck, what do you want to do with it? We need more info.


camaroman7d 01-24-2004 11:47 AM

killerformula, is right on the money. We need more info.


molevolent_creations 01-24-2004 12:26 PM

if you guys read the" 377 destoked 400" post from before it says it all,
i didnt add to that one cause its old and like 4 pages now i think

its gona be for racing, at the strip. we went over the whole shoulda kept the 400 crank and stuff but im working with what i have right now, and i might change the crank and stuff a few years from now.

i do drive the truck on the road but its just for blowin people at the lights,
im not to worryed bout gas mileage and what not , i just need the quick truck so others on the street recondnise...

right now it runns 16seconds in the quarter mile, and thats with all that stock stuff listed above....
anyone with any info on what i should use, i would greatly appretiate it

killerformula 01-24-2004 12:35 PM

You're goign to go nuts on the street with so much stall. Why don't you go to a machine shop and see if they will trade you even up for a different crank rather than switching it a couple of years from now? You're going to spend all this money on brodix heads and a nice intake and an expensive cam just to not have the bottom end you want? A new cast crank can be had for very cheap, less than 300 bucks for sure. I think you could probably find one on ebay for 150, why not just make the switch now?!

Personally I really don't think this is the right way to build this motor for the truck, you're defeating yourself to get track numbers you could very easily get without so many RPMs or stall, plus it would be drivable on the street, your setup, unfortunately is not going to be very streetable. You're also not going to have a truck anymore either, because all those mods and engine changes will make the usefulness of the truck about nil.

Put a 383 or a 400 in it with a dual plane weiand stealth intake, not much stall, a mild cam and some decent gears (ones that wont tack out on the highway). If you're going to spend all this money do it right, you'll be happy you did-


molevolent_creations 01-24-2004 12:48 PM

well i already have the heads and **** in there
i bought the engine off a builder last year droped it in like 5 days before the strip and it ran 16s and i was pretty happy with it,

say i do go all out this year....cause im now thinkin about it alot.
how hard is it to stroke a 400?
like a 434, do i have to get things machined? or can i just drop in the crank use my rods ?
or do i have to alter my block for clearance issuse?
any help would be great, im just wayin my options here
if its to hard to do the 400 stroked then ill just stick with what i got ,, and add the cam intake carb stall and gears

oya when you stoke a 400 does it go back to internally balanced? or is it external

killerformula 01-24-2004 12:55 PM

Strokers should all be internally ballanced. You should use a ballanced flywheel, of course, too. 434 I think is tough to get, an easier stroke is the 427 which is a great motor. You're only talking 8 cubes anyway. I think there's one of two issues to overcome. The block will definately have to be notched to accomodate the stroker assembly, but the exact details of that could probably be handled by your machine shop. Secondly, special rods, a small base cam or both must be used. Remeber if you use a small base cam you'll have to re-measure everything in the valvetrain and get different pushrods.


molevolent_creations 01-24-2004 01:23 PM

i dunno if its worth all the hastle this year then....
plus if i dont do it this year it gives me something to look forward to next year......:)
so any answers to the original question then?

im thinking a 2500-3000 stall.
4.11 gears or 3.73...leaning towards 4.11
and edelbrock air gap intake
and a holley 750

and the cam thing
o ya and tire size....

thanks guys.
o ya it wasnt to bad for torque either this year it still cracks the tires loose, so it might be better for off the line if i dont have a crazy amount of torque......i
let me know what you guys think

camaroman7d 01-24-2004 06:20 PM

You would be taking on a major project to try to stroke that 400 block to 434 or 427. There are a few issues with doing that with a GM block. I am not going to get into all that.

I agree a 377 might not be the best choice, but if that's what you have lets try to make it work.

If you are mainly concerned with performance, go with the 4.11's and 3000-3300 stall.

Why in the world would someone put a stock cam in a 377? (with Brodix heads),(nevermind).

Get a good solid flat tappet cam (need to know the weight, gears, intake, compression ratio, etc..) to make a suggestion.

I would go with a Vic Jr. with an open spacer, (you are going to have to spin this thing), if you want torque you should have built a 383 or 400, since you didn't use the engine for what it is best at.

Now that you will have more power than you know what to do with, how are you going to get that power to the ground? All the power in the world will do you no good if you can't hook.


molevolent_creations 01-24-2004 07:17 PM

i think you understand me royce..
its not that i put the stock cam in it, its that i ran out of cash when i was building this engine,
so the stock one stayed in for a bit....
now i have some flow again so i can finish this thing.

i think the truck is around 2800 pounds
its got 9.5:1 compression right now
im thinking of a edelbrock air gap intake
and 4.11 gears

any info on that will help greatly...
thanks guys
o ya its got a th350 with a shift kit and fresh rebuild, new clutch packs and all.

molevolent_creations 01-24-2004 08:39 PM

well ive been doing some reasearch and i could build it to a 415

found a kit on the net that comes with this stuff

COMP. RATIO: 58cc =10.8-1, 62cc =10.5-1, 64cc = 10.2-1, 76cc

for like $1049.00

but i still need all the intake and carb and the cam....

camaroman7d 01-24-2004 08:50 PM

If your truck is down to 2800lbs I would be shocked, unless you have some fiberglass and have removed all excess weight. For an example a typical street Camaro weighs 3500lbs (talking 67-73).

You have to decide how much you want to spend and which direction you want to go. Once you know that then ask specific questions and you will get some great advice from the guys around here.

The reason I say that is: It takes a lot of research (time) to look up cam specs, compression ratios, what if this? what if that? So at least know what you want to do, so guys don't waste time giving you advice and then you decide you are going to build something else. Don't take this the wrong way, we are all here because we like talking about cars and helping each other out.

Once you know which engine you want to build (unless that is now the question), let us know and I'm sure you will get plenty of advice.

Personally if money is an issue, then keep the parts you have and make them work. If money is not an issue then build the larger engine. I know one thing for sure a running slightly smaller engine will beat a big engine that is still sitting on the stand because you don't have money to finish it.

Throw a cam in that 377 and a single plane intake, enjoy it for a while. For under $600 you can be out creating havoc. If it don't reach your goal (What is your goal?), you could always put a little juice to it.


molevolent_creations 01-24-2004 09:19 PM

well i guess what engine is now the question...
im just wonder all the stuff ill have to change if i build a 415 now.
or i could stay with the 377 and add the intake cam carb stall and gears,
which im gona have to do with the 415 anyways,
will the cam change in size lots if i do build the 415 oposed to the 377?
cause i could by the rest of the stuff right now and then if all is good i can redo the bottom end......
what about stall speed?

camaroman7d 01-25-2004 12:30 PM

At 19 years old, I think money is probably the limiting factot (I know it was when I was 19 and still is and I am 36).

Keep the 377 and put a nice healthy solid cam and a 3000 stall in it. This will get you where you want to be. Get a single plane intake and call it good. If you decide to build the larger engine in the future a cam will be a small expense in the grand scheme of things anyway. So buy a cam that will work in the 377 and if you build the other engine later just buy a new cam at that time. You can't have it both ways.


Robinson Robin 01-25-2004 02:11 PM

My 791/2 weighs at least 4200lbs and thats with fiberglass fenders and hood there is no way your truck only weighs 2800lbs as camaro mentioned nova's and camaro's are 3000lbs plus and they are consitered pretty light

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