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Discussion Starter #1
My new motor is completed and in the car running.I do like the way it feels. What do you think it will run or should run.
Combo
Forged Eagle Crank at 4.250
Cam: Crane 252/260 mec. FT with 114 lobe sep
Clevite H Bearing
GM melling oil pump
Sparkplugs- c63yc replacement
8" Balancer
BBC 6.385 Eagle Rods
Dart 4150 9.8 oval Manifold
JE 496 4.320 9.2:1 Pistons
MSD Distributor single pu
MSD Ignition with 2-step
Edlebrock 112 cc RPM Heads
950 HP
2" hooker sup comps with 3" pipes
Flowmaster super 40s

Dyno Results:
RPM TQ HP AF:L AF:R
4500 586 504 11.87 12.41
4600 590 519 11.93 12.29
4700 591 531 11.93 12.29
4800 590 541 11.83 12.44
4900 588 551 11.82 12.34
5000 585 559 11.77 12.28
5100 582 568 11.73 12.36
5200 578 575 11.72 12.19
5300 573 580 11.56 12.33
5400 566 584 11.53 12.28
5500 558 586 11.57 12.23
5600 545 584 11.51..12.40
5700 533 580 11.58 12.42
5800 522 579 11.46 12.39
5900 515 581 11.42 12.40
6000 509 583 11.48 12.34
6100 498 581 11.48 12.23
6200 490 581 11.58 12.08
6300 480 579 11.57 11.98
6400 469 575 11.62 11.90
6500 457 568 11.67 11.88

What do you think my shift points should be?
BTW, I run a M-21 with a 12 bolt posi and 411 gears
My best with the old combo is in my Sig
Thank you in advance
 

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Discussion Starter #4
That's a dual plane or single plane intake. Quite a spread in A/F between R and L bank. Good luck hooking getting it hooked up.
It is a single plane intake. What does that difference in AF mean?

Bob
LOL thats what my engine builder said also so I won't go to the track until the end of the year so the car is not down for the season. If I ease it out (LOL) will it last longer?
What are the possibilities with it if all goes well?
BTW I also run MT et streets.
I'm getting a lot of pressure to go auto but I'm fighting it but I'm getting weaker.
Thanks again
John
 

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It is a single plane intake. What does that difference in AF mean?

Bob
LOL thats what my engine builder said also so I won't go to the track until the end of the year so the car is not down for the season. If I ease it out (LOL) will it last longer?
What are the possibilities with it if all goes well?
BTW I also run MT et streets.
I'm getting a lot of pressure to go auto but I'm fighting it but I'm getting weaker.
Thanks again
John
I think a lot of the longevity has to do with whether the trans has good bearings. A sloppy, high miles unit won't last long.
 

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I think a lot of the longevity has to do with whether the trans has good bearings. A sloppy, high miles unit won't last long.
You are certainly more optimistic than I am. I spent a good portion of my youth destroying these tranny's with alot less power than this. A TH 400 would be a good fix. Before he breaks the 4 speed.
 

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An automatic will always be quicker than a manual trans beyond a certain power level, providing a reasonably good converter is used.
 

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Yeah.....maybe....if you can't drive or set up a stick car....and a stick is a LOT more fun!

The right clutch is critical to making any stick trans live. Too aggressive breaks stuff.

That thing hangs on well and is flat from 5200 to 6500. It's not going to be real picky about shift points...but for me it would be up in the 6700 rpm range with a stick.

That cam on a 114 must be a real sweet driver too.

Looks like a LOT of fun!

JIM
 

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John,

Very nice. If you can get it to hook and leave the line pretty aggressively, you should be able to get the car into the 10's depending on weight of the car.

What does the car typically 60'? You are going to need a low 1.5x or high 1.4x to get to the 10's.

I would start out shifting at 6500 RPM. Might like a little more with the stick as Jim mentioned.
 

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Yeah.....maybe....if you can't drive or set up a stick car....and a stick is a LOT more fun!

The right clutch is critical to making any stick trans live. Too aggressive breaks stuff.

That thing hangs on well and is flat from 5200 to 6500. It's not going to be real picky about shift points...but for me it would be up in the 6700 rpm range with a stick.

That cam on a 114 must be a real sweet driver too.

Looks like a LOT of fun!

JIM
Good point on the 114LSA. I really wonder if the marginal gains (what I consider marginal anyway) are worth running a 110LSA vs a 114LSA cam - on a true street car.
 

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If you dump the clutch at 5000 rpm...probably not much!

114 is pretty wide.....with no more duration than that.....gotta drive nice. 114 might be what's making it hang on so well on top end too.


JIM
 

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Discussion Starter #14
With the difference in A/F, I would have thought you had a dual plane on there. Single plane intakes typically don't have that problem.
Is that a problem?
Blue malibu
what does 59-61 mean?
Woody
I don't think the m-21 is sloppy and I believe the bearings are good
ssbkwik
I too want to be optimistic but reality doesn't always agree.
I am thinking that if I do go auto, the TH-400 is where I'll go
540 Hotrod
I agree that a stick is more fun. Thats why I'm fighting it so much since I drive it every day possible and go to the track 4 or 5 times a year but I like good results at the track. The car seems to drive a lot better on the street when I get good results at the track.lol.
The car drives really well on the street with the 114 and idles well also.
I don't know how aggressive the clutch is being a CF/DF, I was told they work well on the street but are maybe too harsh for the track without adjustments.
Dragracer
I like that number but it seems a little out of reach. I would be happy with mid to low 11s so if I have to put a rollbar in it, it will still be around 11.5. But 10s would be so so sweet but I'm trying to keep it real.
Shifting around 6500 will be a blast. I figure if I set my light at 6000 by the time I shift I could be close to 6500.
GRN69
I was wondering about the lsa also but I really like it's street manners
540HR
I always left on the 2-step at 3000 not knowing if it can take any higher plus with the 468ci I had an airgap and the tq was strong down low and would spin like crazy.
 

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nice combo!,if i were you i would call liberty's gears and see if they have a hemi box that they would trade you that muncie for,the hemi box will handle that power and not cost you alot if anything on a trade.

i see your in bristol ct,who built/dynoed the motor?
 

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Discussion Starter #16
nice combo!,if i were you i would call liberty's gears and see if they have a hemi box that they would trade you that muncie for,the hemi box will handle that power and not cost you alot if anything on a trade.

i see your in bristol ct,who built/dynoed the motor?
What exactly is a Hemi box and why would they trade me for one? Are you talking about the a whole new tranny or just the gears?
Yes I'm in bristol and the motor was built by Bobs Machine or Bruneau Engine Research. He also built my 468 and does a lot of SK Modified motors. I'm really happy with his work and have gotten to know his workers well. I would certainly recommend him highly.
 

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Sorry should have read
5900 to 6100 shift points.
 

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john,a hemi box is a chrysler 18 spline 4 speed trans used with cars equipped with hemi's in the late 60's early 70's

it's very common to adapt these boxes to a chevy,just drill the bellhousing,tack weld nuts,or they have an adapter you can use,but i like to dril the bellhousing

other than that you use an 18 spline clutch disc,and change to a 29 splined yoke on the driveshaft

i ran one for years in a blue/white 55 chevy at lebanon valley

it is a 10 second transmission

liberty's modifys and buys/sells muncies and hemi boxes.you'll be adding lots of strength in the trans dept

bobs is excellent
 

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Discussion Starter #19
Sorry should have read
5900 to 6100 shift points.
ThATS ok, I was kinda liking the sound of it.
john,a hemi box is a chrysler 18 spline 4 speed trans used with cars equipped with hemi's in the late 60's early 70's
Thanks I will have to do some research
it's very common to adapt these boxes to a chevy,just drill the bellhousing,tack weld nuts,or they have an adapter you can use,but i like to dril the bellhousing

other than that you use an 18 spline clutch disc,and change to a 29 splined yoke on the driveshaft

i ran one for years in a blue/white 55 chevy at lebanon valley

it is a 10 second transmission

liberty's modifys and buys/sells muncies and hemi boxes.you'll be adding lots of strength in the trans dept

bobs is excellent
Thanks I will have to do some research.
Has anyone else heard of this swap?
 
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