My 377 build.

[Reziel_1983]

Well I put my 377 in my 83 lwb today and I figured I would make a thread with some pictures in case anybody cared. Started with a 400 sbc 4 bolt main that was really gross looking. Got the block machined, and put the spacers, bearings, and crankshaft in.

Here are the specs on the engine:

400 Small Block bored .030 over,
destroked with a 3.48" stroke steel Crank,
dish top speed pro pistons,
Comp Cams XE 268H Hydraulic Flat tappet camshaft & lifters kit,
493 casting number 400 sbc heads 1.94 intake and 1.50 exhaust 76cc with z28 springs,
Holley Street Dominator Dual Plane Intake Manifold,
Holley Street Avenger 670 cfm carburetor

[Reziel_1983]

Here are a few parts that I used.

[Reziel_1983]

Got the pistons, timing chain, cam, and heads on here. Also here's one of the crank in that I forgot to post.

[Reziel_1983]

Motor's all painted up and about to be dropped in! Here is the old motor as well. 350 with performer intake and a bigger cam.

[Reziel_1983]

Engine is in!

[bustedknuckles]

Nice. How's it run?

[Reziel_1983]

Originally Posted by bustedknuckles

Nice. How's it run?

Runs pretty good

[slugish]

Just a note Im certainly not an expert but Ididnt know they made 4 bolt mains on the 400 ci sbc. Learn something everey day .

Also probably another dumb question but what is the reasoning behind destroking a 400 . I have a 408 by the way .

[Reziel_1983]

Originally Posted by slugish

Just a note Im certainly not an expert but Ididnt know they made 4 bolt mains on the 400 ci sbc. Learn something everey day .

Also probably another dumb question but what is the reasoning behind destroking a 400 . I have a 408 by the way .

Yeah I've heard that the 2 bolt mains for the 400 small blocks are actually better but I was on a budget and had to work with what I had :P.

Destroking a 400 to a 377 will give you higher top speed, but take the torque down a bit from what I've heard. I would probably rather have built a 406 but I got the block, a bunch of parts including a 3.48" stroke crank for 300$ and I was on a pretty tight budget so again, I had to use what I had

[Reziel_1983]

Here's a video of it, I'll upload another when I adjust the carb/timing:

83 c10 with 377 stroker - YouTube

[INSIDIOUS '86]

did you prime it with an oil primer first? and run break in oil this time?

[Reziel_1983]

Originally Posted by INSIDIOUS '86

did you prime it with an oil primer first? and run break in oil this time?

Yeah, I primed the oil pump. And no, we just used the delo 15w-40... it seemed to do okay.

[INSIDIOUS '86]

well i would have run some zinc additive to but if it lasted its first ten mins without flattening the cam then your set

[INSIDIOUS '86]

http://67-72chevytrucks.com/vboard/s...d.php?t=466886

post that vid in there! add your exhaust specs

[Reziel_1983]

Adjusted carb and timing today... I'm not sure if it's perfect yet but I'll post a video tomorrow of it.

[rayfinseats]

2 bolt 400 block is probably stronger but. Anyway I would recommend vortec heads !!! It should be a pretty strong motor but Vortec heads would make a big difference in power on a budget. I wish I had that engine

[Hotrodrobert]

I don't see any info on those heads but they are probably 74-76cc chambers and with your stroke and pistons that is about 8.4:1 compression ratio.
You can run almost any gas you can find but I like power.
The Vortec heads recommended by Rayfinseats would be a huge improvement. They are cheap to buy but you would need a different intake so that is more money, but that would be about 9.4:1 compression ratio but the superior chamber design would mean you probably could still run 87 and the power increase would be OVER 50!! with BETTER fuel economy!!

[Your41Plague12]

If you get the Vortecs, make sure you drill the steam holes in them. Other than that, I say go for it.

[Reziel_1983]

I probably would have bought the vortecs but I was really tight on money, barely made it with what it has now! I might get some performance heads for it down the road sometime.

[Reziel_1983]

Carb and timing is set.

1983 Chevy Truck with 377 stroker with xe268h cam...

[slugish]

Originally Posted by Reziel_1983

Carb and timing is set.


1983 Chevy Truck with 377 stroker with xe268h cam - YouTube

Damn tose thumper cams sure do sound bad. Iwas about ready to get on e myself but a number of techs advised I would get better overall performance with a xe 274 which I ended up getting . Who knows , we,ll see once I get it in .

[Reziel_1983]

Originally Posted by slugish

Damn tose thumper cams sure do sound bad. Iwas about ready to get on e myself but a number of techs advised I would get better overall performance with a xe 274 which I ended up getting . Who knows , we,ll see once I get it in .

I don't have a thumpr, I have the xe 268. I might have gone with the thumpr but I read that they are all bark and no bite.

[slugish]

oh for some reason Ithought you said you had a thumper . Yea bark but no bite is what I have heard .

Ihave a xe 268 now & have boght the xe274
but my 268 sounds a lot tamer than yours ? maybe the exhaust

Ihave full lenghth headers > 3 in. collecter into one flowmaster , 3 in in & 2- 2.5 's out dumped behind rear wheel

[slugish]

oh for some reason Ithought you said you had a thumper . Yea bark but no bite is what I have heard .

Ihave a xe 268 now & have boght the xe274
but my 268 sounds a lot tamer than yours ? maybe the exhaust

Ihave full lenghth headers > 3 in. collecter into one flowmaster , 3 in in & 2- 2.5 's out dumped behind rear wheel. I WONDER if Ihad true duels would it sound better.

[INSIDIOUS '86]

have the small thumpr in my truck, alot of bite for a 420 hp 377

have to add 1.6 ratio rockers to the exhaust to make it more like a single pattern cam, really wakes up the cam, not to mention if you set the timing curve right,

im sure if i had some better flowing heads and intake i would be at about 500 hp and great streatability
bark with bit i tell you, the bigger cams for thier size do not deliver i admit, even then if your going to put a massive cam in why go thumpr?