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340 e body.

Moparhead

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What kind of power does it take to get a 70 challenger into the 12s with a 340 ? 410 gears 4 speed. Street tire old school build
 

70chall440

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Not all that difficult but takes good parts selection, assembly and tuning. Check out the direct connection race bulletins for SB E body, they have builds and a layout of parts. Of course these are dated but you need to think of this as a system, everything MUST work together to include the engine, trans, U joints, drive shaft, tires, etc.

Back in the day a buddy and I built a 340 in a 74 Challenger with a mild cam, good intake and carb, headers and 31" slicks and ran 12.6 @ 109 mph. I think we were running 4.56 gears if I remember right and this was a 4 speed car.
 

Moparhead

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Not all that difficult but takes good parts selection, assembly and tuning. Check out the direct connection race bulletins for SB E body, they have builds and a layout of parts. Of course these are dated but you need to think of this as a system, everything MUST work together to include the engine, trans, U joints, drive shaft, tires, etc.

Back in the day a buddy and I built a 340 in a 74 Challenger with a mild cam, good intake and carb, headers and 31" slicks and ran 12.6 @ 109 mph. I think we were running 4.56 gears if I remember right and this was a 4 speed car.
Do you remember what cam you ran sweet combo.
 

70chall440

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No, that was like 30 years ago or more. There are lots of guys here and elsewhere who have build really great HP with a 340, my last one is a 416 stroker, makes like 500 hp and is a beast.
 

Moparhead

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Yeah we liked the old hemi grind still run it today and the 508. Thanks too.
 

340challconvert

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70 Chall offers some good old time hot rodding, workable advice.
Back in the day, I used to run the Mopar purple shaft cam (284 duration) in a 340, low gears, with ported 202 heads, carb tuning, and some sticky tires; and ran Low/mid 13’s without too much craziness. With the new cam technology available today, it should not be hard to go where you want to go!
 

hot metal

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I can tell you exactly what it took to run 12.4's@108 in my '71 340 Cuda back in 1985>

Stock motor, 10:1, stock 2.02 heads unported, DC..590" SFT cam, Strip Dominator intake, 850DP, 1.3/4" race hdrs, 4200stall manual 727, 4.30's, 10x28's, stock 340 L/springs clamped@front, Mp performance shocks with shock extensions and a pinion snubber, weight@the line was approx 3550...motor made around 370fwhp.
 
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