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#1
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I took the 65 /6 to the track!!
Well, I got a wednesday night off sooner than I thought...I went to the track thinking 17.5-7s ( as stated in earlier post). My65 cuda has a 225 slant six 1 barrel bone stock except a .430 lift cam(I got a spec card with that on it when i bought the car) which isnt helping or hurting the engine In my opinion because of the exhaust, look below at details of that.
Well I ran 17.5 @77mph, WOW, I was right on target. Known problems: Points in dist. have not been replaced in a long time, and never have I replaced them in the 6 months Ive had the car, bottom end is suffering because of this I THINK. Carb leaks ( 1brl ) Exhaust is half flat in 2 or 3 different areas that I know of and of course the pipe is not mandrel bent. Its I believe 1 7/8 possibly? CONCLUSION: I dont think 17.3s would not be far fetched as the 17.5 was my first pass of the night. I did launch a little soft in my opinion but I wasnt gonna wait 2 more hours for a third pass. THe second pass when up in smoke terribly, launched too ooooo ooooo high. I ran 18.0 @ 77mph. |
#2
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Good Starting Point
17.5 the first time out, pretty good for a 1BBL Slant.
What gear ratio is in the car? With a little exhaust work, tuning and traction you just may slip it into the high 16s, that would be something for a 1 BBL set-up. I will have to get out to Sac with my SL6 B'cuda and we can "match race"! DD |
#3
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Kewl!
Good job Viper! Let the tinkering begin!
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#4
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TINKERING!!!!!! NO WAY!! I have my aluminum slant six coming from that guy dan on this board, also, got my aluminized coated headers off ebay. I got my slant six head in the machine shop, getting buick valves and doing some porting and bowl work myself. My next big engine buy is the dual weber intake, I think I would rather get the fuel distribution with the dual webers than to put a small 4brl. A guy owes me a free exhaust system, which will recieve a borla muffler. A 5 speed is underway, but I have to sell the 71 Road Runner 340 auto with air grabber hood first, Im thinking 3000$ for the RR will get me a 5 speed. Ill keep you guys updated when that goes on, but.....
I dont think high 16s is too far with exhaust, and carb rebuild, but im not gonna fool with it, I need total concentration on this car because I never seem to finish my projects, but since im already this far into the engine rebuild, only good things to come! DOUG: I believe I got the 321 gears, 71/4 rearend, stock. I reach 4th gear for about 2 or 3 seconds, real low rpm. |
#5
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Trust me on this... A 7.25" Rear is a bad idea for drag racing. The spiders are very weak. When she hooks it will blow.
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#6
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New engine, new rearend. Im not gonna keep the 71/4 rearend, BUT, I DO NOT THINK IT WILL BLOW AT ANY TIME WITH THE NEW ENGINE. I had a 71/4 behind a stock 360 with headers and didnt come close to breaking. Slicks or cheater slicks are the killers of the 7 1/4 rearend. Im only replacing the rearend because I dont want to have the driveshaft for the 5 speed to be for a dinky 71/4. I also have a A-Body rearend in the garage with nowhere to go.
Ive also heard the millions of stories of 7 1/4 rearends breaking, not all have the same mileage so thats probably a main reason. I do admit tho, on the 360 car, I never put anything bigger than a 205-70-14 on it |
#7
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I did say "when it hooks it will blow". Been there, done that. It is okay as long as small relatively hard tires are used. I killed mine on the first pass with a stock 360 Auto and McCrearies.
I also killed a 2.45 geared 7.25" Rear eventially in a 63,000 ml '78 Diplomat 318 2BBL I Bracket Raced for half a season on stock tires (Long story).. If I remember right that engine made around 110 hp. I will say that the rear end in my '64 Valiant 170" 3 speed is still going strong after 278,000 ml. But then the clutch slips at anything approaching a aggressive start. |
#8
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LOL, I cant believe you put mCcrearies on!!!! I still ran 14.23@99mph in that car...but I was babying it off the line!! hehe
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#9
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For what it's worth. I have run nothing but a 7 1/4 rear with a 3.91 sure grip in any of my slant six cars. The exact same rear, switched from car to car, must have 2000 runs on it. I have always run slicks. The cars have ranged from a Z/SA class car running mid 16's, a turbo street/bracket car, turning 13.4's, to a 3100lb cuda with nitrous that goes 13.8's, with a 1.84, 60 foot time. That rear is not as weak as people think. That said, I am building a 8 3/4 rear for the car. Don't think the 7 1/4 will last running 12's, which is my goal.
Charlie |
#10
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Charles I killed the spiders in both mine. Any particular tip to getting them to live? I can't believe that thing is still alive. But then there is a 3600 lb GM F Body Running low 10's in the quater on a stock 7.625 GM at Green Valley so anything is possible.
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#11
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It seems to me, most problems with the 7 1/4 rear are the spider gears. With a sure grip, you are not transfering power thru the spiders, since both wheels pull equally. Also, I run an automatic, so I am not shock loading the ring and pinion gears. When I built mine I set the sure grip clutch pack very tight, to minimize slipage. Also set ring gear backlash at the minimum, so as not to shock the gear teeth. Seems to have worked.
Charlie P.S. I once broke an axel in a 8 3/4 rear with a 273 powered 65 valiant 4dr sdn (12.8's). |
#12
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I took a 7-1/4 out of my Duster when it had 160,000 miles on it and I had made about 500 passes with it. I think the thing that is hardest on them is the burnout. If you are careful it won't hurt it.
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#13
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A 7 1/4 sure grip is pretty strong.
Charlie has the right idea with the sure grip carrier, that take the "weak link" spider gears out of the unit.
I have broken 7 1/4's any way you can think. (broke spider gears, broke pinion stem, split standard center carrier casting, broke the carrier caps, broke axles.....) It's just not that large of a unit to be "beating-on" DD |
#14
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I guess it would be smart of me to check the timing for the first time, I always under estimate the timing. I always forget about the timing, I always do it by the ear, but I never touched the dist. on the /6. I guess, if it runs, leave it alone, but I shouldnt always think that way!!!
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#15
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65viper mentioned something about a 5 speed. I'm looking for into for a 5 speed to go behind a street driven /6 powered '63 Dodge p/u. What kind of trans are you using/gonna use?
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#16
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71/4+318=break down??
I guys I was reading your post on the 17 sec slant 6 thats great!! i was hoping to get 11 or 12 (((1/8 of a mile))) out of my / 6 dart!!! its got A 71/4 rear with 276 gears !! but anyways soon im getting a 318 put in the dart will the 71/4 rear not hold up to the v8 power??? im putting 390 gears in it!!! i hopes so i really dont want to find and install a 83/4 rear well yall have a nice day !!
DART FREAK |
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