360 Build - Suggestions????

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scuba0331

scuba0331

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Hello!

I wanted to get some suggestions on the 360 I am going to build for my 1974 Duster 4-Speed.

I have a stock 1971 360. This is what I am planning to do. Any suggestions would be appreciated.

360 - 1971 Block
Heads - to be flowed by CompuFlow in Medina Ohio
Cam - Mopar Purple Shaft 284/284
Lifters - Hydraulic
Pistons - Keith Black Flat tops - KB 167
Crank - Stock (Polished)
Manifold - Edelbrock RPM Air Gap
Carb - Holley Street Avenger 670
Ignition - Mopar Electronic Ignition
TTI Headers
TTI Exhaust

Any help would appreciated!
 
what kind of heads are they? i would think about a 292/508 mp cam.. that is a 4 speed cam and maybe a 750 holley
 
scuba0331 said:
Hello!

I wanted to get some suggestions on the 360 I am going to build for my 1974 Duster 4-Speed.

Pistons - Keith Black Flat tops - KB 167
Click to expand...

Aren't those the 318 pistons? KB107's are a zero deck piston.

Whats the gear ratio, intended purpose of the build, the flow rates of the head, and actual comp ratio your looking for?
 
I did make a mistake the KB 167's are flat tops for the 318.

My intention for the build is to have a nice 350 HP motor. The car is going to be a driver. I plan on running a 3:55 suregrip. I don't know the flow rates of the heads because they have not been flowed yet. I have a stock 1971 360 that I am using for my base.

It looks like I have a lot more research to do to figure out the correct configuration!
 
Looks good but I would run a smaller cam. Either a Comp XE268 or XE274 or equivalent.
I would also try and keep tire height around 26: with the 355s,
 
I'd do what Adam said. The purple you list is a bit stout for what your looking to do and with that gear ratio, it'll be a little doggie out of the hole.
 
I had the purple shaft in the 340 in my cuda. It was ok but i gained much better idle and more mid range power using the edelbrock performer rpm. The car was also over .2 faster in the 1/4
 
I think your overall goal sounds doable.

350 horsepower is not unrealistic.

If you intend on daily driving it, or putting it on the highway any, I would keep the compression under 9.5:1.

The truth is, you do not need alot of Duration on your camshaft to make good power....Duration is how long the valves stay open.

A more mild duration camshaft (268/272) with more lift than the MP 284* .488, will make the similar power numbers and have more vaccuum.

Get a good timing chain to throw in the mix and your set!!:-D
 
Thanks for all of the reply's. I plan on driving the car as much as possible! Should I go with a taller gear, 3:91, and a taller tire?

This is my first build so I appreciate all of the help. I will get some pictures posted once I get the car home! Hopefully, that will be in the next few months.

Thanks for all of the help.
 
With a 670 carb your 360 with 1.88 intake valved heads at 9.5 compression with the Mopar 284/484 cam will make:

360 HP @ 5500
389 TQ @ 4000

With a 750 carb:

362 HP @ 5500
391 TQ @ 4000
 
No thanks on the pistons. I haven't taken the engine apart yet so I have no idea what it looks like inside.
 
Ok. So it appears with all of the great suggestions that the following should give me a nice combiniation:

RPM Air Gap
KB 107's
Holley or Edelbrock 750
9:5.1 compression
Cam: Comp XE 274

What are the thoughts on changing to a 3:91 with a taller tire possibly 28 inch versues the 3:55 with a 26 inch tire?
 
DusterBoy15 said:
i have 7 out of 8 used kb107 pistons you can buy for the same price of new pistons from Summit.
Click to expand...

Fixed

Back to the subject.
If you are going to do any highway/freeway driving I would stay in the 3.23-3.55 range.
 
Thanks. I do plan on doing some highway driving so I will stay with the 3:55's!
 
Think about the MP 280/474. Much more streetable than the 284. Nice idle, tons of mid range. Easy 325-350 horse combo...
 
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