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#1
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First timer! Challenger Race/Street car
Hello Can any one tell me what a 70 Challenger B Block car would weigh stock with 8 3/4 rear and 727 auto. I have a set of fiber glass fenders and a glass hood for this car. I plan on running a balanced 70 440 10:1 .030 overbore, steel crank, with Hughes engine stage 2 Ported 516 closed chamber heads ( 2.14/1.81) with there matched componits max rate solid cam 239 - 245 dur. and 1.6 adjustable valve train (crane) 582 -597 lift. Tweeked 727 with 2500 stahl. MSD ignition run to 2 step and roll control spining a 8 3/4 4.30 pro gear. Oh yea this will have hooker street headers and a multi carb setup (probably 2 4's). Could I expect low 11 second 1/4 times. This car has factory Big Block Springs, Power stearing, and front disc brakes. Can I run pump 93 petro? How will my timing be effected? I want this car to be some what streetable maybe 4 to 5 times monthly!
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#2
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all in all I like your setup...but I would change a few things,
I would change the heads to hughes stage 2 ported EDELBROCK!! the aluminum heads allow you to run more compression with the same fuel(iron head 9.5:1 is max for 93 octane,aluminum will allow up to 10.5), I would also pass on the 1.6 ratio rockers,hughes cams give plenty of lift,and you will not notice the power differance the high-ratio rockers will give,you might gain 1-5 hp...but is that worth $300+?? 3000 stall would help you alot too...3500 wouldn't bee too much... I belive 4.30 gears is too much,unless you plan on using 29" rather than dual quads,you may get better results with a TQ from demon sizziler with small tube headders and a dual plane intake,dyno 2000 estimates 496HP@6000 and 436 TQ@4000 I figure that your setup will get you into 12.5 range... switching just the heads,I figure 12.25 range heads and 3000 stall puts you at 12.1 3500 puts it at 11.9... correct me if I am wrong,but isn't a roll control usualy used on a manual transmission ?? I would also change your springs... |
#3
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Hittman55; Sorry I can't tell you about the weight of the car. My "73 Cuda S/B 4spd 8 3/4 rear car is 3661 via the reggie. After the typical add on 's..who knows?
You want to know if you can run pump gas. I say that you can on 93. You might not get full distrib. advance though. The cam is large but might not be large enuff to bleed of comp. It's kind of close there in the spec dept. You may need to back it of 2-4 degrees. I think you met your goal. freak007; Correct you if your wrong, roll control is for auto's as well. They can also make an interesting anti theft unit. Why run Edel's when that expens. may be unjust. He may run more comp. but he'll need to due to heat loss with the Alum. head. More comp. more power is the thought right? Not with alum and 1pt. increase You suggestion is mort. I would not pass on 1.6 rockers unless...theres no room &, or the heads can't make use of the lift. So whats the point of useing them unless racing. More aggressive lift, less friction! MORE than a 1-5 hp gain. More like 10-20 hp. Your suggestion of why use them for a 1-5 hp gain is thin. $300 is alot, but, as you go faster, it gets more expensive. So why make the $1200+ switch to Edel's for a minor gain? You use that DYNO2000 alot, and I like it to. It's fun. (Folowing sentence sounds like an echo down a dark hallway from a scooby-doo cartoon) 'Beware of racing dynos. Even more so, ones from the computer! There good for what they are. Now if you had a more powerful program then the dyno2000. I used mine and found a diff of about 55 hp in going from small tube headers w/ mufflers to large tube headers no mufflers. Using a dual plane 1200 cfm. I switched to a single plane and a 850 cfm rated carb. Tryed the big tube/no muffler a vs. the small tube and muffler and still found 50 hp. Dualquads. Now thats interesting. I like the idea. Also like the T-Q and spring change. S/S springs or mono/cal-tracs set up. Then again, stock springs done right will work OK and keep it stealthy. Note; he said streetable 4-5 times a month. That leaves the feild abit open to intended useage. Allmost like, "Whats steetable to you?" Boy o boy do answers vary. |
#4
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your right,I forgot he only wanted to street drive it "4-5 times a month"...
and since that is the case the single plane/large tube is probably a better choice you are also right about the eddie heads,I don't think they are worth $1000 more than the iron,but I still think that the 1.6 rockers are not neccecary,I think he would be lucky to gain 5 hp,as the hughes heads only flow 6cfm MORE at .600 lift than at .550... as for the roll control,I did not know,I had never heard of it on a auto...but hey...you learn something new everyday... since he is not too worried about streetability...perhaps go up a cam size to the hughes 245/250...and maybe a 3500 stall... that would EASILY put you into the 11's...and still be streetable(In my opinion) but barely.... since it would have alot more power,4.10's with 28" tires might be better than the 4.30's/29"... just my opinion... |
#5
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freak007;
lol well, yea, that would be my cam choice. And the rockers might have a clearance problem being the lift is allready high. I also think 4.10's and a 28 would be better. But @ such a cost, I wouldn't change the gears. |
#6
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does he already have the 4.30's??if not then 4.10's would be the way to go...otherwise maybe use a taller tire...I think 29.5-30 should do it...
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#7
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Thanks for the inside man I see your point but Hughes engines have a nice peice of info on coparing after market alum heads. They said that they will not always perform better than the stock heads. out of the box maybe a 5% HP gain, at 400 hp engine this would be only 20 HP. But I do like the idea of more compression with the alum head. As for the rocker arms I have stock non adj, I want adj for various reasons. And the 1.6 are no more $ than the 1.5 i said what the Hey. But If you think I have enough lift with this cam any way. I may go with corrected 1.5 ratio. I have a Ford buddy ( I know what your thinkin) that runs a line lock connected to his 2 step MSD going to 1 switch! So his LOW rpm soft toach works in conjunction with his line lock, with one release of a button his 2 step shuts of and his line lock releases. Pretty cool! I tought about using 2 600 cfm Holleys which I already have jetting them down maybe 2-3 sizes. I may go with a higher stahl I would like a 2800 - 3000 rpm converter to get the best out of my gears. I will be running 1/8 mile up here in Hill Billy country Kentucky.
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#8
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1/8th mile!!!I thought you wanted a 1/4 mile racer...well if thats the case,you can use ALOT more gear(4.56) and/or less tire(26?)...
it just wouln't be much of a highway driver anymore....lol...and freeway...FORGET IT!!!... as for the rockers,if you are replaceing them anyway,and it costs the same either way...go with the 1.6's!!!! |
#9
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1/8 mile? 4.88s and a 4 grand converter. Forget about the street, except maybe from the strip to the drive thru. Suggest you do the rockers - maybe I'd run 1.6 on the intakes and 1.5s in the exhaust??
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