Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1892287
08/15/15 10:22 AM
08/15/15 10:22 AM
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Joined: Aug 2008
Posts: 4,071 Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,071
Mo.
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Same with an 8.75. One under an early 6 cylinder A-body was weak as water. The hi-po units were much better. So which 8 3/4 was the better one? 489,741,742?
Last edited by racerx; 08/15/15 10:23 AM.
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Re: Mark Williams Billet Caps for 8 3/4
[Re: J_BODY]
#1892323
08/15/15 11:53 AM
08/15/15 11:53 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Same deal with Thumpers car..... once in a great while the car sees a track, yet every discussion on this topic the same two chime in on how it doesn't not happen to them. Mike you constantly chime in on this.... are you telling the OP to use the 8.75 over the D60??? Heavy big block stroker with a 4 speed. Your chit, as noted above, is apples to oranges. What a coincidence the factory put the D60 behind performance big block 4 speed cars..... guess they ran low on the mighty 8.75 and figured the D60 would do in a pinch. You must not read... I said... heavy car or a 4 speed will break a 8 3/4.. they work great in LIGHT cars
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1892335
08/15/15 12:15 PM
08/15/15 12:15 PM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,237
North Central, Indiana
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If anyone doesn't believe that 8 3/4 cases don't flex because of the lack of pinion support, look at the housing & the damage to it from the ring gear shearing teeth. This was done prior to the brace being welded to the housing. Dry hops, on & off the throttle at 20-30mph in 1st on the street showing off in my younger years claimed the ring gear that did this. The brace covers the worst part, not sure why the cap didn't break. I am still running the 8 3/4 because i still have quite a few spare cases & only get to the track 1-2 times a year. As mentioned previously, billet caps & braces are just band-aids ... especially on heavy BB cars. A 60 is in the future for my car, because it's stronger/more dependable.
Last edited by bubby440; 08/15/15 12:30 PM.
72 Plymouth Roadrunner 11.08@123.25
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Re: Mark Williams Billet Caps for 8 3/4
[Re: racerx]
#1892378
08/15/15 01:33 PM
08/15/15 01:33 PM
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Joined: Jan 2004
Posts: 8,274 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,274
fredericksburg,va
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Same with an 8.75. One under an early 6 cylinder A-body was weak as water. The hi-po units were much better. So which 8 3/4 was the better one? 489,741,742? Early /6 a-body's? 99% had 7 1/4 rears. My 3 speed /6 Twister has the 489. 741 weakest, 742 then 489 but of those two each has their good and bad points but neither will not hold up behind a 4 speed unless he has 675-14s, they where made with grease I think.
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Re: Mark Williams Billet Caps for 8 3/4
[Re: Quicktree]
#1892385
08/15/15 01:39 PM
08/15/15 01:39 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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How about a 3200 lb 700 horse 470 BB w/stock caps and w/60 ft`s in 1.36`s.......? 700 HP are those CAB 700HP? Yes, we share the same dyno and I drive to Oregon every sunday to dyno my stuff. thats what I thought . 700 CAB HP is around 600 real HP. to give you an example my challenger at 3100#s made 468hp to the wheels and ran 10.40 @ 130mph and thats with a tight converter and 16x32 steam rollers. car would run easy 10.20s range with those corrected. if you think you are making 700hp you are only fooling yourself. YOU`RE kidding right? Screw the "math" equations this and that bs. My old solid cammed 906 headed motor on Pettis`s dyno made 615 hp and 580+ tq. and went 10.40`s at around 3250 lbs. all day. So you`re telling me that a bigger better fully ported e-head and a 680-660 lift w/276-281 @ .050 solid roller and low drag back cut rings is making LESS hp.... Ya right. Put your motor in a street weight car like mine and get back w/me............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Mark Williams Billet Caps for 8 3/4
[Re: J_BODY]
#1892400
08/15/15 01:59 PM
08/15/15 01:59 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Same deal with Thumpers car..... once in a great while the car sees a track, yet every discussion on this topic the same two chime in on how it doesn't not happen to them. Mike you constantly chime in on this.... are you telling the OP to use the 8.75 over the D60??? Heavy big block stroker with a 4 speed. Your chit, as noted above, is apples to oranges. What a coincidence the factory put the D60 behind performance big block 4 speed cars..... guess they ran low on the mighty 8.75 and figured the D60 would do in a pinch. Stop it your hurting my feelings...........NOT! Some of you guys act like I`ve only made 50 passes or something. I have a stack of time slips from the 90`s up till now and use to T&T at L.A.C.R. almost monthly w/a warmed 360 then my BB and even showed Al Alguire my stack of slips when he was here. Back to building carbs and at the end of the year I`ll hit Bakersfield for my 9.60 or better and HOPEFULLY my lowly 8 3/4 lives but if it breaks which according to some it will, then I`ll put it back together and move on.......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Mark Williams Billet Caps for 8 3/4
[Re: racerx]
#1892407
08/15/15 02:16 PM
08/15/15 02:16 PM
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Joined: Aug 2003
Posts: 43,204 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,204
Bend,OR USA
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Same with an 8.75. One under an early 6 cylinder A-body was weak as water. The hi-po units were much better. So which 8 3/4 was the better one? 489,741,742? The 742 is the best stock 8 3/4, the 741 will live very well in a medium weight, medium power BB A body My 440 powered 1969 Dart GTS weighed 3300 lbs with me in it and had many, many runs on the OEM 741 case and posi with the OEM 3.91 gears. That car went 11.17 at 122 MPH in Las Vageas in November many times the last time I raced it here The stock 489 case with the crush sleeve is the weakest of the three, the 489 and 741 have the same size pinion gear diameter size at the front bearing If you put a pinon gear spacer in place of the crush sleeve then it is as good as the 741 The 742 and Dana 60 pinion gear shafts are bigger diameter at the front bearing
Last edited by Cab_Burge; 08/15/15 02:17 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Mark Williams Billet Caps for 8 3/4
[Re: J_BODY]
#1892441
08/15/15 03:20 PM
08/15/15 03:20 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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If you we're making any real power you'd have broke that rear gear by now! (come on! thats funny no matter who ya are!) It IS funny cos everyone I know drives a 9-second car on the street and ALL of make around 599 hp.............just crazy and don`t know how they do it.......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Mark Williams Billet Caps for 8 3/4
[Re: runnerrt]
#1892449
08/15/15 03:41 PM
08/15/15 03:41 PM
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Joined: Jan 2003
Posts: 344 Burlington, Ontario Canada
Dave_S
enthusiast
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enthusiast
Joined: Jan 2003
Posts: 344
Burlington, Ontario Canada
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742 case with MW cap, ARP studs and ring gear bolts, back brace 8.93 @ 149 3050lbs with driver. 1.21 60' I change out the r&pinion every 300 passes. NEVER broke in 15 yrs of racing. (100 passes/year)
Dave Stillie '73 Swinger 5.7 Hemi, 88mm turbo, powerglide, cal-tracs & 8 3/4 Mega-Squirt EFI [email]8.93@149 [/email]
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Re: Mark Williams Billet Caps for 8 3/4
[Re: Roughbird72]
#1892464
08/15/15 04:07 PM
08/15/15 04:07 PM
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Joined: Jan 2003
Posts: 11,713 Portage,michigan
B3422W5
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I Live Here
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Portage,michigan
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Hmm? 3200# car, 9.79 @ 135.5 ... takes around 590-600rwhp to do that, 700hp seems legit to me. My ex car weighs 3220 currently. A while back the motor made 705 ish horsepower on a dyno with Best machine. That motor went 9.62@ 140 on super stock springs. That almost 5 more mph than the above. Huge difference When I had the car( little bit different combo) it went 135@ 3350. I figured it made about 640-650 REAL horsepower. 135@ 3250 ISNT 700 horsepower, it's a great elapsed time, but it isn't 700. More like probably 640-645.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8
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Re: Mark Williams Billet Caps for 8 3/4
[Re: Roughbird72]
#1892474
08/15/15 04:27 PM
08/15/15 04:27 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Hmm? 3200# car, 9.79 @ 135.5 ... takes around 590-600rwhp to do that, 700hp seems legit to me. Naw, Quick said the "math" doesn`t add up........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Mark Williams Billet Caps for 8 3/4
[Re: Thumperdart]
#1892491
08/15/15 05:01 PM
08/15/15 05:01 PM
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Joined: Jan 2003
Posts: 1,237 North Central, Indiana
Roughbird72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,237
North Central, Indiana
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Hmm? 3200# car, 9.79 @ 135.5 ... takes around 590-600rwhp to do that, 700hp seems legit to me. Naw, Quick said the "math" doesn`t add up........ whatever the case your car/chassis seems to be working PDG ...
72 Plymouth Roadrunner 11.08@123.25
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