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400+ hp 360 Build

  
Mopar Muscle
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400+ hp 360 Build

 
Campbell340 Campbell340
New User | Posts: 5 | Joined: 02/08
Posted: 02/26/08
06:39 PM

Hi, I am new to the board, my name is Ben Campbell and I have an 1985 Dodge Ram stepside, dual exhaust, 3:55 posi rear end with a 4-speed tranny with hurst shifter.

The motor in it right now makes ok power. Its a 1970 318 block with 340 cam and windage tray, with edelbrock rpm intake, headman headers and a 600 Holley 4barrel carb.

I want to build a 400+ hp 360 now. I am not on a super tight budget but I don't want to get to carried away hear. Iv read the 400hp 318 article so reaching 400hp with a 360 should come easy shouldn't it?

Im not to sure how Im going to build this yet or what and where to spend my money. So Ill list off what Im thinking and someone can maybe help me out and fill in the blanks or tell me whats a better way to go.

-late 70's 360 block(crank has had machine work done)
-keith black pistons (not sure what comp ratio to use)
-edelbrock 340 aluminum heads
-edelbrock rpm intake
Im not sure what cam to use. Id like one that will give me a good amount of torque for low speed take offs and give me that rough idle but still be street able and If I can Id like to keep my stock valve train  

entity36 entity36
New User | Posts: 3 | Joined: 10/07
Posted: 02/26/08
08:17 PM

i'm right along with yah in the same boat.. maybe not 400 hp but close with the o.e. heads from the o.e. block 76 360 bored over. Cam selection is the hardest part for me. Shoot me a buzz when you find a solid build. I'm gonna be using a larger car, and power brakes with auto tranny so. I have a few more key ingrediants.  

BadFish BadFish
Moderator | Posts: 329 | Joined: 01/07
Posted: 02/28/08
07:51 AM

Guys,

A 400 hp 360 isn't a huge feat, but it's still well over one horsepower per cubic inch so it will take a pretty good combination. I would use either flat top or slightly dished pistons, and make sure they're right at the top of the bore at tdc. Compression ratio will need to be 10:1 or higher, I'd shoot for around 10.5:1.

Edelbrock heads will work, treat them to a little bowl work and get some of the pinch area of the intake runner opened up. As an alternative, Magnum heads will do the job as well. It will require changing the lifters for pushrod oiling and the rockers to Magnum style, but Magnum headed engines run great and make great power and torque.

Speaking of torque, you mention cam selection. First you should consider what type of cam to use. For 400 hp, a hydraulic flat-tappet would work, but a solid flat-tappet would improve power and throttle response. If it's in the budget, a hydraulic roller would probably be the best choice for this combination.

As far as the cam profile, it should match the rpm range you plan to operate in. To make 400hp, you'll likely need to spin the 360 somewhere around 6,000 rpm or better, and you may have to sacrifice torque a little. Figure out all the specifics of your combination and call one of the cam manufacturer's help lines. Comp has a good cam help hotline that will lead you in the right direction.  

Campbell340 Campbell340
New User | Posts: 5 | Joined: 02/08
Posted: 02/28/08
12:56 PM

Iv been reading up on the magnum heads because the edelbrock are a tad expensive but Iv read the magnums are known for the heads cracking.  

Campbell340 Campbell340
New User | Posts: 5 | Joined: 02/08
Posted: 02/28/08
01:36 PM

what about a set of J-heads with 2.02 1.60 valves? Are they more of a low compression head or the perfect for what I need?  

Campbell340 Campbell340
New User | Posts: 5 | Joined: 02/08
Posted: 02/28/08
08:23 PM

I think Iv found mostly what Iv been looking for, these are the numbers Iv been looking for but would like to find out more on the actual engine build, if someone can tell me more about this motor could they please let me know.

http://www.moparmusclemagazine.com/projectbuild/155_0407_mopar_project_stealth/index.html  

drmopar drmopar
Guru | Posts: 1445 | Joined: 02/08
Posted: 02/28/08
10:14 PM

Its tuff to out flow a set of J-heads when they are ported and polished by a pro. I have read articles suggesting they out flow the legendary X-heads when they are done properly.

Dr.Mopar Cool  

428RR 428RR
New User | Posts: 6 | Joined: 03/08
Posted: 03/20/08
05:26 AM

The last model 576 are better than any x or j and the mag heads are even better  

Campbell340 Campbell340
New User | Posts: 5 | Joined: 02/08
Posted: 03/30/08
07:05 AM

Iv been looking at the Hughes engines site and the 408 stroker kit for the 360. I'm wondering what experiences people had with these stroker kits.  

3404spdvaliant. 3404spdvaliant.
Guru | Posts: 771 | Joined: 12/07
Posted: 03/31/08
10:37 PM

I bought a .040 over stroker kit for my 360 I plan on using full ported 974 j heads,
MP.528 solid w/1.6 full roller rockers, 10.1, 1 3/4 super comps through dual 3'.
I'll let you know how it turns out  
age is no lock on brillance

kmulk01 kmulk01
New User | Posts: 20 | Joined: 02/08
Posted: 04/19/08
01:25 PM

This may be a dumb question but it relates to this thread.

To increase the stroke of an engine (specifically a magnum series 360) do you have to replace the entire rotating assembly or just the crank?  

3404spdvaliant. 3404spdvaliant.
Guru | Posts: 771 | Joined: 12/07
Posted: 04/19/08
09:32 PM

Crank, pistons & rings= As in, you can use your stock rods w/ARP bolts if u want.
And clearance the block and pan.
Most budget/mid priced 408 kits use the magnum width rod anyways.  
age is no lock on brillance

gen1dak gen1dak
New User | Posts: 2 | Joined: 04/08
Posted: 04/19/08
10:24 PM

CompCams 268H, Performer RPM AIR Gap intake (it's a dual plane, but outperforms the old RPM intake). The aluminum heads (2.02/1.68 or larger valves), a good 800cfm carb, and a decent exhaust will get you 400hp at the crank. No sweat. Definitely use ARP hardware, as this will be a 6,000rpm engine. The stock rods are proven units, they're fine. CR of 9.0-9.5 to 1.  

drmopar drmopar
Guru | Posts: 1445 | Joined: 02/08
Posted: 04/27/08
07:42 PM

I run ported and polished J-heads with stock valves on my 360, it just ran a 12.56 at 108 in a 67 Satellite, at Toronto Motorsports park April/08.
This in a street driven B-body.
When you figure the car with driver weighs 3600 lbs, that gives me a h.p. rating at the crank of around 450 h.p.
Nothing exotic, 1 5/8 headers.
750 dp
rpm intake
9.5 comp
mp. .528 cam when adjusted .020 it measures .508.  

wells43 wells43
New User | Posts: 1 | Joined: 01/11
Posted: 01/22/11
08:03 AM

I have a set of j-heads fully ported and polished shaved .30 thous 2.05 valves they are the best i have tried I run them on a 60 over 360 in a mud truck I beat the chevy guys that run there 421 stroker motors  

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