building a 408 stroker ,12 to 1 comp ,eq heads 2.02 valves light porting , dual plane high rise intake ,800 cfm carb ,904 trans 3500 stall convertor , 3.50 gear , hughes roller cam .560 int .562 ext 236 int 242 ext .050 107 centerline. cal trac setup 26inch tire how much hp and et. in a 1973 dart. what would you change?
408 stroker hp
- Thread starter gm442
- Start date
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Any head work done?(1.92 or 2.02 valves,bowl porting,fully ported?). Vehicle weight ,suspension setup,transmission and or converter ,gears & tire size,are needed ). Drag racing,is like high school Algebra: Can't compute the answer,without all the factions.
doogievlg
Well-Known Member
If your wanting a low et then get some 4:11 gears or higher and a taller tire.
fishy68
Tyr Fryr's Inc.
That's a whole bunch of compression. I can't imagine it'd run on pump gas. It seems to me that all the other parts (mild roller cam, dual plane intake, street gears and converter, and lightly ported heads) are geared more towards a street driven engine yet you say it'll be 12 to 1 compression which is race gas territory?? You asked for suggestions about changing anything, depending on what style of driving I'd either lower the compression to a pump gas friendly 10 to 1 if it's to be street driven. Or if I were going to race it I'd stick in a lot bigger cam and lower gears and possibly a higher stall speed that matches the larger race cam
Woods74
Enlightened Senior
16 thousand. 10 gallons to the mile.
moper
Well-Known Member
EQs are iron heads. Depending on the quench and piston design I'd lower the static it by a point to a point and a half from even 11:1. Lose the dual plane intake - personally I'd go with a cleaned up M1 single and a spacer. The carb's too small. Get an HP950. Depending on the car's weight, your engine and suspension tuning, the track, and ultimately what you got with for parts - somewhere between high 11s and high tens.
If you're running at the track, I wouldn't run pump gas in it with 11:1. Around town you could back off the timing and maybe run pump. That's what I'm doing with my 11:1 iron head motor. But everything is designed specifically to do just that. Do you know your dynamic CR? I'd back the static down if you strictly want pump gas. Assuming you're winding this engine up fairly high, I would step up to a taller set of gears, and maybe tires too. I changed from a 3.73 and 26" tire to 4.10 and 28" tire. The 4.10 ratio with the 28" tire is almost identical to a 3.73 and 26" but the 4.10 and 28" combo will still gain some over the old combo. Bigger carb, converter should be good, you'd probably benefit with a single plane intake over the dual plane. I guess what we'd really need to know is if this is just a track car or street/strip car.
Mopar to ya
Well-Known Member
Depends on what you want. Low end torque or higher speed. I have the same basic setup except for Eddy RPM heads. I have 12:1 compression as well. With a Super Victor high rise manifold it made 498hp and 528 ft/lbs of torque. I went to an RPM Air Gap manifold because I wanted more torque. I can run 93 octane and do quite often, but I have to change the timing. When I run race gas, I tune it up and get full power. I run 4.10 gears, I have 26 inch tires and I run Caltracs with mono leafs. All in my 73 Dart. We match pretty close. You will spin the tires bald. I even tried Mickey Thompson ET Streets and I can spin them all day long. The main difference is I went with an overdrive tranny so I can drive at higher speeds as well.
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