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Old 01-27-2008, 06:36 PM
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How to prevent Overkill

on my 318 I want to put 360 heads maybe after they've been vatted..

and .. etc

what new parts are req'd from the 318 heads to the 360? Rocker arms, push rods?

and do they need to be ported? or anything?

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Old 01-28-2008, 08:32 AM
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318 mopar factory cam build up, covering 360 heads

http://www.geocities.com/alwest_83/318

"The heads are the #302 swirl port casting from a 1987 318. The heads have the larger 1.88"/1.60" valves installed, competition valve job and were treated to a full port job. Intake is the Edelbrock Performer. Carb is the Holley #3310 750cfm vacume secondary. Headers are basic fit all 1 5/8" primary tube. Cam is the Mopar Performance P4452761 with .450"/.455"lift , 268/272 duration. timing was set at 35 degrees total for the dyno test.

330 horse power @5750rpm.

How does that sound? The exact motor was also dyno run with 360 heads installed and it produced 290 h.p. @5750 rpm. That shows how port velocity is so important. But...290 h.p. is no slouch for a 318."

factory 80's 318 get 8.5:1 ...with 360 heads 7.5:1

go magnum heads. they give 9.1:1 , have better than vortec flow/ valve size 1.925/1.625" . very little needed for the conversion. make an easy 375 hp.

crosswind rpm magnum intake $150
paired rocker 1.6 factory 8 x $9
3100 springs and retainers 16x $9
the big summit cam .441/.441= .470 lift $69
im using the mp2783 "340 4bbl cam"

Last edited by spinn; 01-28-2008 at 08:50 AM.
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Old 01-28-2008, 08:52 AM
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LA head swaps from allpar / rocker and pushrod spacing data included.

http://www.allpar.com/mopar/LA-V8-en...ead-swaps.html

go magnum! bolt on mod! you can get a pair of magnum heads and rockers for $75-100 at the boneyard. $30 bucks should cover some, useable 3100 valve springs. dont forget to snag the retainers too.

a 302"cop" head 318 will get 320-330hp top
a magnum head will give you +50 more

Last edited by spinn; 01-28-2008 at 09:00 AM.
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Old 01-28-2008, 08:36 PM
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are the 5.2 and 5.9 magnum heads the same or are there any differences? I know they'd work either, I'm just wondering if the 5.9 ones would flow better than the 5.2's...also, how hard to find are carburetor friendly intake manifolds for magnum heads? thank you
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Old 01-29-2008, 08:38 AM
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re: How to prevent Overkill

There is no such thing as "Overkill", only Kill.
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Old 01-29-2008, 09:30 AM
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re the 5.2 and 5.9 magnum heads the same or are there any differences?
YES

as far as i know there is only one part # for magnum heads.
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Old 01-29-2008, 09:32 AM
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wait there is alumium casting as well. same ports cast and valves.


the mags are no joke

here is a 318 magnum head build. mild cam 400hp
http://www.moparmusclemagazine.com/t...ild/index.html

Intake/Exhaust Intake Exhaust
Valve Size 1.920 1.625
Ports As Cast As Cast
Port Volume 177cc
Chamber 53 cc
Lift
.050" 31.2 23.5
.100" 64.9 60.2
.150" 90.8 93.6
.200" 117.6 121.7
.250" 143.4 142.5
.300" 166.9 173.9
.350" 186.3 186.4
.400" 200.4 194.2
.450" 210.4 199.7
.500" 215.2 203.6
.550" 218.1 205.1
.600" 221.1 208.3

they'll pony up with any vortec offering. face it, small blk crysler heads are slim pickings. untouched these are perfect for making power on the streets. crysler knows it , thats why they are on the trucks. untouched they will support 430-450 hp.

Last edited by spinn; 01-29-2008 at 09:50 AM.
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Old 01-29-2008, 10:00 PM
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aight thank you spinn...those are definitely pretty impressive heads, I'll be lookin into a set if I decide to build a truck with a 318 or 360 in it for sure...according to a quick desktop dyno session using those airflow specs you listed a 360 with Magnum heads will smoke a comparably built 350 with vortecs...thats with the same size carb, and the same lift/duration cam and 9:1 compression, definitely interesting...they look pretty close though...looks fun

Last edited by DR132; 01-29-2008 at 10:23 PM.
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Old 01-30-2008, 07:00 AM
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Quote:
There is no such thing as "Overkill", only Kill.
Um, what about 'Death From Above' - AIRBORNE!
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