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3300 pound car; want to do 12's in 1/4 mile

8K views 20 replies 7 participants last post by  69 widetrack 
#1 ·
What kind of horse power would l need to do to get it in the 12's. I'm thinking 350 or so...Any opinions would be helpful, thanks
 
#2 ·
750+ carb

hi ignition

good single plane for 6500 rpm+

mechanical cam like 284/284 .530+" compression to match

deep pan increase capacity

manual body

4000 stall

4.30+ gearing 9+ x 28" slick

Go all out.

I never made it past 13.0 flat. If I wanted to crack into the 12's with a sbc , I d try that.
 
#20 ·
750+ carb

hi ignition

good single plane for 6500 rpm+

mechanical cam like 284/284 .530+" compression to match

deep pan increase capacity

manual body

4000 stall

4.30+ gearing 9+ x 28" slick

Go all out.

I never made it past 13.0 flat. If I wanted to crack into the 12's with a sbc , I d try that.
my 1982 f body at 3400 lbs

355 10.5 to 1
292 flat tap hyd
dual plane intake
q jet
th400 3200-3500 stall , no manual v/b
4:11 gears and 28" slicks.. ran 12.78 on motor
and almost 10 flat on gas
cars set up. is worth more that hp.. 9 times out of 10
 
#5 ·
Horse Power is great, but you can have all the horse power in the world and run 16's if you can't get the power to the pavement. You need to have the suspension set up properly so that you can transfer the weight to the rear wheels. If all the weight stays up front, it's not a total waste, there's always burnout competitions...LOL

Ray
 
#7 ·
what kind of car? are you going to use slicks or drag radials? what engine? are you willing to use steeper than stock gears? 4 speed or auto?
Like already mentioned 400 ish HP engine can do it with the correct set up. you can do it with less hp if the engine is a torque monster.
toss in the car info and what type of driving you will do when not racing,and lets talk a few combinations
 
#10 ·
The performer 350?

low 12's.. How about 15.0 flat.

The 440 is sacred to me. That is one impressive tank of a bastard. It was a little soft on compression back then, I couldn't afford heads. It was still dynamite. 13 seconds and I thought it was the fastest thing. The number does not sound so fast nowadays.
 
#11 ·
spinn,Im saying your mopar should go low 12s,except if it has the dodge direct connection,purple camshaft.

WDCs example is a well set up car could sneak into the 12s with 350 hp. so many variables,I would rather tell someone their car will go 12.9s with a 12.20s engine,,,just in case there are other problems
 
#12 ·
Okay with my current engine dyno sheet . What would my current 440 , all rollered out , do in the quarter.

71 cuda convert 4 speed. Its a 3.23 in it now, but there is a 4.10 pumpkin somewhere. 26" tire. 4000lb? No idea.



The hp tq do match at 5250 or whatever, the graduation is weird.
 
#14 ·
It's a 1985 pontiac grand prix; chevy stuffed. Planning to put 373s in the rear end; with either a th400 or th350. Most likely a 350 or bigger small block. Right now its a 305 with a cam 600 carb, headers, dual glass packs with a 700r trans. That's the vehicle it needs to run on pump gas.
 
#16 ·
Title weight says 3309 pounds. 2 hundred pound driver. So l'd say at most 3600 pounds more than likely less weight due to stuff taken off the car, keeps it lighter. Super charging 305 can't be done. The engine needs help losing a main bearing or oil pump low pressure. Rather build a 350; got a friend that does dirt track. Put's 305 HO heads on 350s between 10-10.5 pressure ratio Flat tops. Seeing what l could do with that kind of set up
 
#18 ·
Title weight says 3309 pounds. 2 hundred pound driver. So l'd say at most 3600 pounds more than likely less weight due to stuff taken off the car, keeps it lighter.
Don't trust title weight. Title weight on my '09 Silverado is 5800, true certified CAT scale weight with me in it at 180 pounds is 7140. The only addition from the factory is a 40 gallon aux fuel tank, about 350 pounds full, so my actual weight is almost 1,000 pounds more than stated.
 
#19 ·
350 with,cam like this hydraulic roller

110255-10 CL110255-10 284 288 231 235 .510 .530 110 106 Hyd. Hyd. 1,2
2200-5800 Rough idle, Street/Strip performance. Great low to mid-range torque & power.
750 hp Holley,performer air gap, Dart shp or better heads,10:1 cr,1 5/8 long tube headers,MSD 6AL or better ignition,3k-3300 converter,50/50 rear shocks,maybe 90/10 front shocks???loosen sway bar on front when racing,improved fuel delivery system,28x9 slicks or maybe shorter?lose 100 pounds off front of car,more total if possible.

If you buy bargain parts,think about a little more cam&CR&rear gear.
 
#21 ·
"Gearheadslife' I think your right in many cases about the cost of suspension set up being worth more than horsepower. I've had some real torque monsters of motors that ran high ET's, put the proper suspension underneath that engine and cut a lot of that quarter mile time...it's all about how to get the most use out of that strong engine. Loosing weight, the right tires, gearing, suspension, they all play rolls every bit as important as Horse Power. One question I've never hear'd an OP ask is, how can I improve my driving skills to get a better ET. The difference between me driving my 70 AMX in quarter mile and my wife driving the car is about 10 seconds, why, same car, same Horse Power and in this game 1/100 of a second can be the difference between winning and loosing.

Ray.
 
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