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Topic Review (Newest First)
12-22-2009 11:04 AM
engineczar http://www.moparmusclemagazine.com/t...ild/index.html

Here's a pretty good article on the 318 with Magnum heads build.
12-22-2009 10:51 AM
engineczar
Quote:
Originally Posted by octanejunkie
Included in the purchase is a brand new Edl Air-Gap intake, will that work as is with these heads on the magnum?
Will these heads work on the 318 that is in the car now? Not sure what vintage the 318 is yet...
Going back to the purple cam, will that work in the 318?

Included in the purchase is a brand new Edl Air-Gap intake, will that work as is with these heads on the magnum? Depends on the part number, Edelbrock made Magnum and Non-Magnum versions

Will these heads work on the 318 that is in the car now? Yes with the correct lifters, pushrods, and headbolts

Going back to the purple cam, will that work in the 318? If the block is pre-'85 then yes
12-22-2009 10:30 AM
octanejunkie
Quote:
Originally Posted by engineczar
Those are Magnum heads. There are some really nice builds using those heads on the 318. In stock form they flow more air than any of the earlier small block heads except for the W2 heads. The key to making them work on the earlier LA small blocks is that you need to use lifters that have through oiling (AMC lifters) as they use an oiling setup similar to the small block Chevy where the oil supply to the heads and rockers is through the pushrods and not through the deck to the rocker shafts like early LA's. They also have an intake mounting configuration that is unique to the Magnums so early manifolds aren't going work unless you do some mods.
Good info, thanks. Now a few questions:
Included in the purchase is a brand new Edl Air-Gap intake, will that work as is with these heads on the magnum?
Will these heads work on the 318 that is in the car now? Not sure what vintage the 318 is yet...
Going back to the purple cam, will that work in the 318?

I am not familiar enough with mopar gear yet and am getting up to speed, and loving the challenge of the new project and it's possibilities
12-22-2009 10:09 AM
engineczar Those are Magnum heads. There are some really nice builds using those heads on the 318. In stock form they flow more air than any of the earlier small block heads except for the W2 heads. The key to making them work on the earlier LA small blocks is that you need to use lifters that have through oiling (AMC lifters) as they use an oiling setup similar to the small block Chevy where the oil supply to the heads and rockers is through the pushrods and not through the deck to the rocker shafts like early LA's. They also have an intake mounting configuration that is unique to the Magnums so early manifolds aren't going work unless you do some mods.
12-22-2009 09:57 AM
cobalt327 I had a '74 Scamp, was a good car. 318 2-bbl. (all they had for the 318 then). Do you have a casting number for the heads?

Lightened up the image some:



Anyone else notice the similarities between the MOPAR and Vortec chambers? Plug angles are different, and the MOPAR has maybe a shade more shrouding, but otherwise kinda close.
12-22-2009 09:39 AM
octanejunkie
Quote:
Originally Posted by engineczar
The 1999 magnum block was a roller cam motor and the Purple shaft cam you have is not. Are the 360 heads magnums as well?
I am not a mopar guy, yet, and haven't seen anyting but pictures, I am told these are 340 heads but I am not sure of anything yet...


Can you tell what heads these are?

Since I am in no rush to build the magnum motor, and if by chance the 318 has good compression, I might install these heads on the 318 and have fun - or perhaps just sell them to finance proper heads for the magnum

Glad to hear it's a roller motor, Mikey likey the idea of less friction up top
12-22-2009 09:27 AM
engineczar The 1999 magnum block was a roller cam motor and the Purple shaft cam you have is not. Are the 360 heads magnums as well?
12-22-2009 07:35 AM
octanejunkie
Quote:
Originally Posted by 327NUT
Sounds like a fun project.....the only thing I would suggest is to tell him to keep the USED cam.
I hear ya, and on first instinct I agree. I did move a cam from one motor to another after proper break in and seasoning once upon a time we will see in the long run how that holds up I wasn't planning on it for this build though but I do what to see what that cam looks like

Quote:
Originally Posted by engineczar
...using the most accurate wheel offsets we could calculate we were still only able to wedge a 9" wide tire in there.

Is the 360 a magnum or an earlier LA style 360?
I am considering tubbing it, depends what I decide to do with the car after I go over it completely. The 360 is a .030 over 1999 magnum, hot tanked & decked, with new cam bearings installed

Thanks F-Bird '88 for the "build sheet" - the heads will get checked and if good will get treated to an in/out bead blast and a freshen-up of the valve seats and guides as required and new springs to match whatever cam I run. Will see what comp ratio I get with the supplied new FT forged pistons before I ink anything.

For fuel delivery I was thinking about the 1000cfm P3+ from Retrotek (www.retrotekspeed.com) with spark control when it comes out in Feb '10 rather than the 4-bbl AFB that is on there now.

The car currently has an 8-3/4" rear end, prob non-posi, but I am getting an A body Dayna 60 with posi 3rd member, perhaps it will get built and go in vs. the chrysler unit, but i was thinking 3.55s for more street-friendly gears and a slightly lower stall speed

The car also currently has 340 exhaust manifolds and x-over dual exhaust and stock, not sure what I am doing there yet either. It comes with new tires on the stock rims so I'll keep those for running around town and rolling it while I build it and decide what the final rim size/style will be - I would like 10" or bigger in the rear and will consider tubbing it
12-21-2009 08:55 PM
engineczar I love A body Mopar projects. Getting a lot of rubber underneath a '71 Scamp is gonna be an issue unless you tub it. We ran a '71 Dart back in the 80's and without modifying the wheel wells and using the most accurate wheel offsets we could calculate we were still only able to wedge a 9"wide tire in there.

Is the 360 a magnum or an earlier LA style 360?
12-21-2009 06:40 PM
327NUT Sounds like a fun project.....the only thing I would suggest is to tell him to keep the USED cam. For what NEW cam's cost it's just not worth or even reasonable to install one....even if you get the lifters that are still matched up to thier specific cam lobes. Enjoy building it though.
12-21-2009 08:18 AM
octanejunkie
360 Magnum build

OK first post here, go easy on me...

Picking up my first mopar project car on christmas day, a '71 Scamp. Fell in love with one in a parking lot on Saturday, found one on eGay Sunday morning and won the auction Sunday afternoon after a few phone calls with the seller - nice guy. There is minimal cancer and luckily a good friend is an old-time (read lead) bodyman so we will make short work of the skin job.

The car comes with a running 318 in it and a built 904 behind it, AND a prepped .030 over 360 magnum block, balanced rotating assy (crank, flat top sealed power pistons and rods aldo not installed,) 360 heads (not sure which #,) new Perf RPM Air-Gap intake, windage tray, a spare Dana 60 A-body rear with posi 3rd member and a whole bunch of other stuff - his loss was my gain; and I know that pain... The car has new x-pipe exhaust installed and 340hp factory exhaust manifolds on the 318, seems he was going for a higher-output build

Anyhow, he is throwing in a 284 purple cam (4120235) pullout, not sure I will run it, but I am considering a medium performance street/strip build. Can anyone offer any advice on the mopar cams? I almost feel more comfortable with the 268/284 (4452783) cam on a 115 LC degree'd-in but haven't decided how to go - probably want power brakes either way.

Supposedly the 904 is built and I will probably throw the Dayna 60 in there with 3.55s and stuff the fenders with as much rubber as thy can hold or tub the sucker, not sure there either.

This will be a once-in-a-while driver (read I didn't really need this car) but I want it to be fun and slightly less than practical I will probably keep the Air-Gap intake and go EFI with the POWERJECTION III from Retrotek - or put the PJ3 on my truck and the 600CFM AFB on the Scamp - not sure there either.

Any advice is appreciated, thanks for reading and here's a pic for those who like pics

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