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Author Topic:   1/4 mile Gears
ss38k
Dirt Full Roller

Total posts: 61
posted May 27, 2002 07:09 PM
what do most of you all run for gears on 1/4 mile track .Banking is some were around 15 degrees.i have a strong 383. with 90" to 92" tires on back of car.i had a final of a 7.6 was spining comeing of bad .and i was runing 6000 rpms before end of strightaway.and 6500 on exit when i stand in it.i am thinking of going to my 6.7 final.do you guys think that is to big of a change. if so i can go with a 7.1 final.i have been told that i should try to get around a 6.8 or a 6.9 thank you for any help .this is a ford 9" thanks again

malibuchevy2
Dirt Full Roller

Total posts: 43
posted May 27, 2002 07:54 PM
i run a 650 gear 0n a 1/4 mile track tach about 5800 rpm with 57 percent rear weight

redneck bubbas racing
Dirt Freak

Total posts: 213
posted May 27, 2002 09:12 PM
On a 1/4 most around these parts run either a 6.86 or a 7.29.

Scoot
Dirt Freak

Total posts: 330
posted May 27, 2002 10:38 PM
My brother had a 7.04, it worked great.

------------------
Scoot
Smith Racing Team
870-365-5989

smallrock98
Dirt Roller

Total posts: 19
posted May 27, 2002 11:01 PM
355 Chevy Engine
Powerglide Tranny
Ford 9" Rearend With 3.89
Final Drive Equals 7.02

Havent tried it yet but will know how it works this weekend.

ss38k
Dirt Full Roller

Total posts: 61
posted May 28, 2002 10:13 PM
thank's everyone .going with my 6.7 for this week.try them once or twice. then do the same with my 7.1 and then see were i can go from there .Just wanted to make sure i was in the wright range.my goal is to finally go to a 1 to 1 ratio.i was just reading a story on gears in my July circle track they said for a 1/4 mile 383 or a 406 go with a 6.50 6.66 6.83 and try and stay aroud 5800 to 6000 rpms what do you guy's think .THANK'S AGAIN EVERY ONE. {{{GO FAST AND TRUN LEFT}}}

ss38k
Dirt Full Roller

Total posts: 61
posted May 29, 2002 02:05 PM
quote:
Originally posted by smallrock98:
355 Chevy Engine
Powerglide Tranny
Ford 9" Rearend With 3.89
Final Drive Equals 7.02

Havent tried it yet but will know how it works this weekend.



PEDDLER
Dirt Freak

Total posts: 298
posted May 29, 2002 07:09 PM
How about a 7.94 @ 7500.
Don't be scared.

The Peddler

ss38k
Dirt Full Roller

Total posts: 61
posted May 29, 2002 10:47 PM
[QUOTE]Originally posted by PEDDLER:
[B]How about a 7.94 @ 7500.
Don't be scared.

peddler i already ran a 8.00 and a 7.66 and all i do is spin exiting the turn's.rpms were at 6500 max i have been told that you want to stay around 5500 to 6000 with a 383 or a 406 or you are going past the power band what do you all thik thanks again

ryan
Dirt Freak

Total posts: 430
posted May 30, 2002 12:34 AM
I beleive what your taliking about would be the 406 and the 377 correct? From what I have read elsewhere you have to really crank on the 383 and the 355's for the H.P. and the 406 and the 377's at 6,000 or under. Never had much expereience at it. Just going by what I've read

ss38k
Dirt Full Roller

Total posts: 61
posted May 30, 2002 05:59 PM
quote:
Originally posted by ryan:
I beleive what your taliking about would be the 406 and the 377 correct? From what I have read elsewhere you have to really crank on the 383 and the 355's for the H.P. and the 406 and the 377's at 6,000 or under. Never had much expereience at it. Just going by what I've read

hello ryan the way i understand it is that a 355 and a 377 both use a 350 crank whitch run better at a high rpm. and the 383 and the 406 have a 400 crank in them and run better at a rpm like 5500 to 6000 versie a 355 or 377 at 6500 to 7000 rpms what do you other guys think hey jammin don't be afraid to speak up thank's guys

wam24u
Dirt Full Roller

Total posts: 66
posted May 30, 2002 08:36 PM
I ran a 383 at 6800 and got a good look at the rods in a way I did'nt want to see them.
It depends on what kind of rods you have,taking a stock rod motor over 6000 scares me!

BayouGent
Dirt Forum Racer

Total posts: 87
posted May 31, 2002 09:05 AM
ss38...unless someone is building something that I haven't seen before (which is possible) the engines should be like this:

355 = .030 over 350 block with 350 crank
362 = .060 over 350 block with 350 crank
377 = std. bore 350 block with 400 crank
383 = .030 over 350 block with 400 crank
391 = .060 over 350 block with 400 crank
406 = .030 over 400 block with 400 crank

The 377 on up with that 400 crank I've read that you don't want to turn them over 6500 RPM's but with the right crank, rods, and pistons it doesn't mean that you can't. With stock crank, rods, and pistons I wouldn't recommend it though. Remember some people seem to have more luck than others. Whether the motor is still making power at a really high RPM has to do more with the camshaft, valvetrain, and induction more so than the cubic inch. Turning those bigger cubic inch motors up higher just takes more "cubic dollars". Hope this helps!!

Bayou

BayouGent
Dirt Forum Racer

Total posts: 87
posted May 31, 2002 09:08 AM
Holy cow...what made my blue smiley turn into a giant?? LOL

ryan
Dirt Freak

Total posts: 430
posted May 31, 2002 01:05 PM
quote:
Originally posted by BayouGent:
ss38...unless someone is building something that I haven't seen before (which is possible) the engines should be like this:

355 = .030 over 350 block with 350 crank
362 = .060 over 350 block with 350 crank
377 = std. bore 350 block with 400 crank
383 = .030 over 350 block with 400 crank
391 = .060 over 350 block with 400 crank
406 = .030 over 400 block with 400 crank

The 377 on up with that 400 crank I've read that you don't want to turn them over 6500 RPM's but with the right crank, rods, and pistons it doesn't mean that you can't. With stock crank, rods, and pistons I wouldn't recommend it though. Remember some people seem to have more luck than others. Whether the motor is still making power at a really high RPM has to do more with the camshaft, valvetrain, and induction more so than the cubic inch. Turning those bigger cubic inch motors up higher just takes more "cubic dollars". Hope this helps!!

Bayou



A 377 is a 400 .30 over with a 3.48 350 crank.
The math equals up to 377 both ways but I think that usually when someone refers to a 377 they are talking about a destroked 406.
jmo



ryan
Dirt Freak

Total posts: 430
posted May 31, 2002 01:09 PM
Thought we could use another big blue smiley face on here

AC156
Dirt Freak

Total posts: 295
posted May 31, 2002 01:14 PM
ryan is right...around here when people talk about a 377, they are talking about a .030 over 400 with a 350 crank.

smallrock98
Dirt Roller

Total posts: 19
posted June 02, 2002 12:21 PM
I pulled 5500rpm's at the races last night. ****.......I was hoping for at least 6000 with that set up. Looks like I'll have to put in a 4.11 gear in the rear.

BayouGent
Dirt Forum Racer

Total posts: 87
posted June 02, 2002 11:39 PM
Ya got me on that one Ryan. Guess that what happens when someone like me grows up around drag racing. When someone talks about a 377 around me, it's usually when they've ordered a stroker kit for a 350. I had never done the math for a destroked 400 but I learn something new every day. Thanks!!

P.S. Thought about putting another blue smiley face but I figured everyone's had enough...LOL.

ryan
Dirt Freak

Total posts: 430
posted June 03, 2002 12:36 PM
LOL

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