Visit The Dirt Forum for More Information

Author Topic:   377 Question?
BIGDADDYBOZ
Dirt Freak

Total posts: 466
posted February 16, 2005 07:45 PM  
How long will a 377 with spacers last? Also are they a good motor? Thanks

chomme
Dirt Freak

Total posts: 300
posted February 16, 2005 10:02 PM  
Whats the Scat number on the crank? I have to use a Chevy Block. Thanks

locorace27
Dirt Roller

Total posts: 14
posted February 17, 2005 01:01 AM  
I agree with Chomme, you're better off using the crank and bearing combo that was designed to create a 377, rather than the spacers.

However, before you get too involved in the "how" , have you given enough thought to the "why" ?

A 377 engine is an interesting creature. Relative to other SBC hybrids it is the most uncommon, yet under the right circumstances, the most successfull at delivering specific results.

A 377, being closer to square than a 383 for example, will rev quicker and higher but with less torque and bottom end, making it a great motor for stop-and-go tracks, especially if they have a long straight or "paper clip" shape.
If the car is very light and doesn't require torque to get it up and off the corner great! Or if traction is limited coming off, a 377 can open up and come up to speed unlike the torque motors that will spin if not feathered.

While great at some things a 377 also has it's draw backs.
Being good on revy tracks means that the valve springs have to be changed regularily.
Being more square means that the bore is bigger, hence the piston is heavier, hence the rod and piston need to be higher quality than a lower reving design.
With the revs the oiling system needs to both keep up and be restricted.

On and on..

Built and used correctly, the 377 is awesome.


NJantz
Dirt Forum Champ
Total posts: 755
posted February 17, 2005 06:38 AM  
We always ran spacers in our 377. Never once had a bearing problem.

As far as the application, It always worked best for me on a momentum track and it wouldn't burn the tires off coming out of the corners when it slicked off. My experience was with a modified on imca tires.

[This message has been edited by NJantz (edited February 17, 2005).]

BIGDADDYBOZ
Dirt Freak

Total posts: 466
posted February 17, 2005 10:59 AM  
The motor i'm getting is a 406 now but he has all the pistons rods and spacers for 377. Would it be better to just get a 400 crank and leave it 406 and sell the 377 stuff? Thanks for all your replies.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted February 17, 2005 11:35 AM  
If you are in a heavy car and dont want to turn a lot of rpms then I'd stick with the 406. It will have the torque to pull you out of the corner, especially if you are on a tight cornered track where rpms drop a lot. The 377 works really good if you can turn it harder and/or keep rpms up.

iowatoolman
Dirt Freak

Total posts: 369
posted February 17, 2005 12:53 PM  
do you know what a square motor is???
it means that the stroke and bore are the same...
and if using junk vavlesprings you will have to replace them if turning high rpms
but if you are using springs that are made to do the job they will be fine
i run a roller cam (high valve pressure) and turn almost 8000rpm all night and haven't had a spring fail or need replaced in 2 years
IF YOUR GOING TO GIVE INFO GET IT RIGHT!!!
quote:

While great at some things a 377 also has it's draw backs.
Being good on revy tracks means that the valve springs have to be changed regularily.
Being more square means that the bore is bigger, hence the piston is heavier, hence the rod and piston need to be higher quality than a lower reving design.
With the revs the oiling system needs to both keep up and be restricted.

On and on..

Built and used correctly, the 377 is awesome.

[/B]



Xtreme12x
Dirt Forum Champ
Total posts: 874
posted February 17, 2005 01:36 PM  
Iowatoolman not everyon races those High Dollar Figure 8 Cars you do that require your huge engines.

I have no Idea what a Square motor is, but I do know that a 377 will get the job done. You'll need a decent set of valve springs, and turning 8000 RPM isn't neccissary. A good solid motor ran at 7000-7250 will do the job with the right cam and carb combo. Get it to flow, our 377 that we had in a modified, was a real good piece, H-Beam rods, Billet Crank, 230CC Dart Iron Eagles and we HAD to turn it abouto 9000 RPM. Keep your runner size small on the head's and you'll be fine.

stockcar5
Dirt Forum Champ
Total posts: 578
posted February 17, 2005 03:00 PM  
calm down there iowatool man. i think he meant "oversquare" everyone makes mistakes. even the greatest of figure 8 drivers.

------------------
www.geocities.com/dirtstockcar5

locorace27
Dirt Roller

Total posts: 14
posted February 19, 2005 02:14 AM  
Lowatoolman, before you get your panties in too much of knot, go back and reread my post. No one said the 377 was "square" , and yes I know exactly what it means.

The point I was trying to make was the different characteristic of the motor , versus say a 383 with its longer stroke or a 406 with its pure displacement advantage.( which of course can be wiped out at higher rpm when mail order heads are unable to flow enough to met the larger demand. )

As for the valve springs, (not junk yard ! ) that is the first part that needs to be changed out on a regular basis with any motor which makes more than backyard H.P. , but even more so on a 377 which by design and intent is going to rev higher.

We have at least one of every sbc configuration in our shop which we are constantly experimenting with.

We certainly don't know everything and don't pretend to, but we are successful and don't mind sharing info that we think is right.
If you disagree, that's cool, but keep your ****y attitude to your self.


iowatoolman
Dirt Freak

Total posts: 369
posted February 20, 2005 09:32 PM  
hey i didn't mean to get you mad it was just all the people adding stupid information (WRONG OR HURTFUL)
I was just trying to correct the information i quoted
nothing more nothing less

and to bad you don't like figure 8's

haha drive hard or drive home and don't forget your ba**s and have a nice day

Back to the Archives