motor/tranny/rear combo

-
2

2doorswinger

Well-Known Member
Joined
May 19, 2014
Messages
512
Reaction score
19
Location
canada
Hey guys I've got a 408 wuth eddy heads being built, it will be back by a 69 833 and 8 3/4 rear with 4. 10's and a sure grip. What do you guys think of this combo? The car has a 29" drag radial on it. What kind of et's di you think it can pull?
 
With a 4 speed and sticky tires, I'd be more comfortable with a Dana 60. It's also a bit harder to hook and be consistent with a stick if you will bracket race it. Car weight is also a big factor determining the life of an 8 3/4" rear.

I have a 360 and 904, footbraking to 11.20's @ 117 weighing 3,540+ lbs in my race only application. It has an 8 3/4" rear with braced housing and gears with REM and cryo treatment. I check them periodically and they last several years. But if I had to start from scratch, I would have gotten a Dana 60....even with the automatic.

I'll let people with a similar combo offer their predictions. Too many variables for me to try.
 
Its going to be a street car, drive it almost every day, maybe see the track a couple times. Thanks for the input !
 
I got a 1980 Volare coupe 60 over 360, 10.5 :1, with lunati 60403 cam and speedpro h116cp pistons with a "308" cylinder head , Cast iron 1971 intake manifold number 3512100, carter thermoquad carb#6322 , hooker 1 5/8 headers in front of a 727 trans with shift kit factory high stall. stock 7.25 with 3.21 rear. weights 3380 with me in it. Any guesses to horsepower and quarter mile times? Thanks.
 
2doorswinger said:
Hey guys I've got a 408 wuth eddy heads being built, it will be back by a 69 833 and 8 3/4 rear with 4. 10's and a sure grip. What do you guys think of this combo? The car has a 29" drag radial on it. What kind of et's di you think it can pull?
Click to expand...

All depends on how much torque you have :blob::cheers::banghead::glasses7::happy1::eek:ops:















Just couldn't stop my self.
 
High 13's..... Have fun with it..... Hope you dont have to drive in traffic with a leg press clutch.... Keep us posted how it dose... :)
Castrol Raceway is the place to race !!!!!! ;)
 
I have a 1970 duster with a 408 with eddy ported heads, 10.5 to 1 , 833 4-speed 391 gears and 28 by 12.5 mickey drag radials. I ran a best of 12.20 @ 119. I think with a harder launch it should see 11's . Good luck!! Also dyno was 397 rwhp
 
2doorswinger said:
I thought for sure it should be into the 11's!
Click to expand...

At 119 mph, Bryan340's car may have the potential of running high 10's, or at least very low 11's. But the biggest trick is to find the optimum gear for max accelleration while getting it to hook. Carb tune, timing converter and cam also play a role. That's why I can run 11.20's at 117, because I have high 1.40 60' times. It has a little more potential, but finding it with what I have to work with gets expensive and time consuming. There are Stock class cars with less motor than mine that are even faster!
 
hp depends on your head porting, cam, intake, carb / efi etc.

i'm guessing that you have an eddy intake and probably a .500-ish cam so probably 475 - 500hp

with perfect shifting you could squeak out a high tens depending on the weight of your car.
95% chance that with good shifting, 60ft time, car is hooking you will end up in the 11's somewhere. 2900 lbs car maybe 10's .

locomotion's car up there looks like 455 HP at the wheels, so probably 540 HP at the flywheel?

in order to match his time your car will need to be much lighter
 
Well, for comparison....My 410 has Eddy heads, 10.8:1 compression, MO875 with 4.10 gears, 727, 8" converter, 275/60/15 Hoosier drag radials, and it has run 10.5's @ 125mph in street legal trim....with that said, I would bet you would have 11 second potential, but would probably run low 12's to high 11's until it breaks something. Drag radial + 4speed + 8 3/4 = good chance for broken parts on a sticky race track....JMO.

You have multiple weak links there unfortunately (trans and rear), made worse by the unforgiving hit of the DR tire if it sticks. If you mostly run on the street you will probably be ok though. You would have an easier time launching the car with a bias ply slick or street slick (due to the forgiving sidewall).
 
You must log in or register to reply here.
-

Back
Top