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  #1  
Old 04-22-2009, 09:27 PM
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Polara_68 Polara_68 is offline
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Question #302 Heads -on ‘86 318 (truck)..

I can get the heads and/or the entire 318 2-bbl engine from an ‘86 Dodge D-150 Pickup.

What is the likelihood of this engine having the desirable #302 heads..?

I know that I’d have to check the casting number to be sure
(found under the rockers, isn’t it..?)

I did a web search and I keep seeing varying years and applications listed for #302 head production,
and I don’t want to tear into the heads on this salvage yard engine
if there’s no chance at all of them being #302 heads..

Also, even if they are not #302 heads, would these heads be of any advantage
over the heads on my 1968 318..?

Th
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  #2  
Old 04-22-2009, 10:44 PM
passing you passing you is offline
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good chance, real good....
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  #3  
Old 04-23-2009, 02:03 AM
TK TK is offline
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Five bolts to pull the vale cover!

Oh, and better? yes and no, if not 302 heads, they wont flow as good, but have hardedned seats.


Give and take.
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  #4  
Old 04-29-2009, 09:56 PM
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Polara_68 Polara_68 is offline
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The plot thickens -
since posing this question, I have since heard (from reliable sources)
about what are known as "HD Heads",
which were installed on 318 4 bbl engines in police cars from '83 thru '89.
Are these "HD Heads" the same thing as the #302 heads,
or are they an entirely different animal..?

I'm beginning to think the hell with all this lol
The car has good compression and runs like hell w/ the original '68 heads,
so they can stay on it, but I am still curious in learning about
these various "HD" and #302 heads
and what vehicles (and what years) on which they were installed..

Last edited by Polara_68 : 04-29-2009 at 09:57 PM.
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  #5  
Old 04-30-2009, 02:40 AM
TK TK is offline
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tHEY ARE big chamber 360 heads.......

Big ol Boggers.
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  #6  
Old 04-30-2009, 10:49 AM
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gees..... there not what ever TK said 'bigolbogers'

He does have the 360 head part right, however they would not be well matched to your combo since they have larger runners and larger valves to go with. valves not being the real issue.

Unless you were to build the motor around those heads they would not make a snappy motor out of a stock 318 bottom end.

Instead you would have the 302boss 4v head syndrome where it makes good power but only after 3500-4000rpm lol

Big ports on small bores need rpm to assist the lack of air speed, thing is when an engine revs it gets less air then you see in a cranking compression test, like say 150psi cranking and 50-75psi running @ 4000+rpm, so now you would be making even less cylinder pressure then you would assume you'd already made by running those big chambered/port 360 heads.

Now if you bump the compression to say 10.5-11.5 with a dual plane 'for the street' you'd be in business, though you would need to pick camshaft wisely in order to bleed just the right amount of pressure off and then set the advance curve to suit to run pump gas.

The closer the piston to the valve, the sooner the flow is initiated.....
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  #7  
Old 04-30-2009, 02:38 PM
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my 85 ramcharger and w150 both had 302's,both 85;s so yes it will have 302's,,a very good head,get the whole engine as it will be a roller block..
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  #8  
Old 04-30-2009, 03:19 PM
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chrysler300le chrysler300le is offline
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302 heads came out in 85 on all 2 bbl 318's. 4bbl 318's during the 80's had 360 heads and the later ones were about 75 cc. They had huge combustion chambers. The cop car engine only had about 7.5:1 compression ratio but they ran decent. Its BS that 360 heads make 318's have a soft bottom end. They run about the same down low with 360 heads but above 3000 they really wake up.
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  #9  
Old 04-30-2009, 06:26 PM
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DonCarr DonCarr is offline
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-Here are some basic 318 articles.
-The first one is basic bolt-ons with unported 318 open chamber heads. (max 270HP) http://www.compcams.com/Community/Ar...?ID=1968181674
-Next series of tests has pocket ported open chamber 318 heads with 9.8 compression. (max 345HP)http://www.compcams.com/Community/Ar...?ID=1826270359 75HP gains over previous article with pocket porting, bigger cam and more compression.
-Here are heavily ported 302 castings making over 400HP and over 400TQ http://www.hotrod.com/howto/113_0304...ild/index.html
-Heavily milled and mildly ported 360 heads on a 318, 400HP, 390TQ http://www.popularhotrodding.com/eng...ine/index.html
---Summary - dyno tests usually start at 3000+rpm, so performance below 3000 is unknown. 318 heads may develop more power here.
-Closed chamber 302 castings need zero deck pistons for greatest quench improvement and heavy shrouding around valve increases swirl but hurts flow.
-EQ magnum heads (cheapest off ebay?) easily break 400HP unported, 445+HP ported on 318's.
-Stock magnum heads can break 400HP unported but may not be the best casting to invest machine shop money in due to cracks. Better to start with EQ magnum or RHS Indy 360X.
-(mildly planed 318 heads with home pocket porting show great bang for the buck)

Last edited by DonCarr : 04-30-2009 at 06:39 PM.
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  #10  
Old 04-30-2009, 09:04 PM
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Thumbs up

I appreciate the info and food for thought in all these replies..
thank you gentlemen


About the roller block -
Is there a stamping or casting code somewhere I should check to fully verify
that it's a roller block in this 318 2 bbl '86 D150 pickup..?
Or were all 318's of this year roller blocks..?

Thanks!
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  #11  
Old 04-30-2009, 10:08 PM
TK TK is offline
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86 should be a roller block, but like I said, pulling the pass valve cover is easy. It is old enough to maybe have had a rebuilt. Thats why you should check.
I am not sure about the block casting numbers, I am like 3000 miles away from my book.

And don't let anyone tell you it's BS that the 360 heads don't kill the 318 down low. There i a big difference. Been there, done that, and a 318, with 318 heads, and a 4bbl manifold, runs better than a 360 head 318 (Stock to stock). By far!

Last edited by TK : 04-30-2009 at 10:10 PM.
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  #12  
Old 04-30-2009, 10:11 PM
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86 will be a roller block.
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