which engine? The Duster or the Magnum in the truck ?
360 Magnum vs 340 mild street build - my experience
- Thread starter 318willrun
- Start date
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To me, most of us have always had a "1/4 mile" marked off someplace out of town where we'd run our cars. To me, that was street racing. As far as stop light to stop light, it's usually all about reaction and traction. But equally geared, both getting traction, I say the 360 for the win. There are two places I found 360's shine against "equally built" 340's. One is the 60 ft (150 ft really...). The other is the big end. Why? The extra torque gets the weight moving (enertia), and at the big end the extra cubes push against the wind pressure in a high(er) gear better.
This is a different 360 magnum I bought for the Duster. The truck has a stock 360 Magnum with a carb. I want to upgrade this new 360 Magnum with a new cam and Aluminum heads on the stock short block. I want as much cam as I can get and still retain my vacuum for power brakes and AC controls.
Cley
LOL ... Ha! I meant which cam of MINE are you asking about? The one in the LA 360 in my Duster? Or the one in the magnum in the truck?
I was thinking the one in your truck. I will be going roller or sure.
Cley
Cley
I like the cam a lot. Idles pretty smooth considering, and pulls hard from the git go to about 5600 rpms - easily can shift at 6k but it doesn't gain anything.
TT5.9mag
Two atmospheres are better than one
I got that number from the Richard Holdner video. I am looking for the most roller cam I can use and still retain vacuum for brakes & AC controls. I thought maybe a bit more than this cam might be possible.
Cley
C'mon, man! I have no secrets!
I share and show everything we do! I posted the cam card here and in the video when we put the Bombcycle together. I'll see if I can find it. That engine would put your Duster deep into the 12's ....
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Thanks, I am going to rewatch the videos anyway so I can get the info there.
Cley
Cley
Thanks alot!
Cley
Cley
TT5.9mag
Two atmospheres are better than one
Well it’s going to depend on your heads, And how much converter you put in it and what gear is in the back. Will your compression stay around the stock 9:1? Saying I want the biggest cam I can fit usually ends up with the customer saying “the car is a dog until 4000rpm” and the builder says “that’s what you asked for”.
It's a stock long block. The car is a 74 Duster with an A500 auto with a stock high stall converter (2500 rpm or so) and a 4.10 gear.
Cley
Cley
I just watched them all again. You mentioned in one of your video that you used 1.5 rockers. Is this a mistake or did I hear you wrong?
Cley
The cam was ground for a 1.5 rocker. The magnum has 1.6, so that will add about .030 lift.
Slantsix64
Well-Known Member
Magnums are the **** period. 5.2 or 5.9 we had a stock 5.2 with 1 dead cylinder and one cylinder with 25 psi run a 9.3-9.5 in the eighth of a mile lol would do great burn outs with 3.55s and a833. i can only image what it will do when we rebuild it with a better camshaft!
All this 340 and 360 talk is boring. 
It would be better if members focused on what there build is and what they did to it as well as the rest of the car.
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