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Re: best way to increase hp in my 318? [Re: Moparmad] #2607836
01/16/19 11:57 PM
01/16/19 11:57 PM
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roadrunninMark Offline
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The hotrod article for 400hp 318 is "junkyard jewel". Here is the link... https://www.hotrod.com/articles/318-small-block-build/

Re: best way to increase hp in my 318? [Re: Moparmad] #2607846
01/17/19 12:21 AM
01/17/19 12:21 AM
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Originally Posted By Moparmad
This was the California emission variety. I did install 4 barrel aluminum intake with fitech fuel injection. I will look on the block and get the date I think it is a mid 80’s though


Block is less important. Head casting numbers, which are under the valve covers, are more important. It was in the mid 80s when high swirl heads were being released, but they still had open chambers (less than ideal squish and compression). It wasn't until the 90s that the small chamber, high swirl and tumble Magnum heads came out.

Hopefully ATK can give you the scoop on heads and cam.


Originally Posted By roadrunninMark
The hotrod article for 400hp 318 is "junkyard jewel". Here is the link... https://www.hotrod.com/articles/318-small-block-build/


This would be link number 4 to this article that was first posted in reply #3.

Re: best way to increase hp in my 318? [Re: Moparmad] #2607999
01/17/19 12:05 PM
01/17/19 12:05 PM
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Supercuda Offline
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302 heads, mid 85 release, where small chamber, high swirl and tumble LA heads


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: best way to increase hp in my 318? [Re: Moparmad] #2608022
01/17/19 12:46 PM
01/17/19 12:46 PM
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That's also around the time roller cams were coming from the factory. Moparmad might luck out and have all of the good stuff, or he might have just missed it and got traditional LA stuff.

Re: best way to increase hp in my 318? [Re: Moparmad] #2608027
01/17/19 12:54 PM
01/17/19 12:54 PM
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Moparmad Offline OP
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I confirmed it is 302 heads and they shoot for 9:1 CR. But they allow 3/10ths either way. Could be from 8.7:1 all the way to 9.3:1.

Casting date on block is 11/24/84

Last edited by Moparmad; 01/17/19 12:55 PM.
Re: best way to increase hp in my 318? [Re: Moparmad] #2608042
01/17/19 01:28 PM
01/17/19 01:28 PM
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So. Burlington, Vt.
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302 heads, without some “work” done to them aren’t an easy path to 300hp+.

Even with some cost effective work(subjectively speaking), they’re not great.

IMO, better off selling them to someone who really wants a set and replacing them with something more hp friendly.

Alternatively, you throw some parts at it...... it makes what it makes, and you live with it and you start saving for that 360.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: best way to increase hp in my 318? [Re: Moparmad] #2608047
01/17/19 01:37 PM
01/17/19 01:37 PM
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302 heads are fine for a mild build. Put a 340 cam in it, a 4bbl intake on it and a 318 with 302 heads can run nice. Is it even close to 300hp? Probably not, it is worth spending any more money than free on 302 heads for HP builds? Nope.

Now if they had made 308 heads with a closed chamber then we'd be talking.

Use magnum, heads if you are going with a stock type casting for a HP build.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: best way to increase hp in my 318? [Re: Moparmad] #2608121
01/17/19 03:45 PM
01/17/19 03:45 PM
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moparborn Offline
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if you up the valves on those heads to 1.88 and 1.60 and do some port work ,they will make over 300 horses ,and more with assistance(turbo,supercharger).

Last edited by moparborn; 01/17/19 03:46 PM.
Re: best way to increase hp in my 318? [Re: Moparmad] #2608582
01/18/19 02:24 PM
01/18/19 02:24 PM
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roadrunninMark Offline
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TC...actually my link is a different article than posted in reply #3. Completely different test with additional information.

Re: best way to increase hp in my 318? [Re: roadrunninMark] #2608662
01/18/19 04:53 PM
01/18/19 04:53 PM
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Originally Posted By roadrunninMark
The hotrod article for 400hp 318 is "junkyard jewel". Here is the link... https://www.hotrod.com/articles/318-small-block-build/


and this is without get new pistons closer to deck...

and composite headgaskets ?

Re: best way to increase hp in my 318? [Re: Moparmad] #2608745
01/18/19 08:21 PM
01/18/19 08:21 PM
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Big Bad Bee Offline
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I’m surprised nobody asked what read gears you are running. I know that wasn’t in your question but it has everything to do with the answer. Start with 3.23SG bare minimum. Doesn’t matter go much HP you make if you don’t have the gears.


I’m listening.
Re: best way to increase hp in my 318? [Re: roadrunninMark] #2608768
01/18/19 09:32 PM
01/18/19 09:32 PM
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Originally Posted By roadrunninMark
TC...actually my link is a different article than posted in reply #3. Completely different test with additional information.


So it is. My bad.

Re: best way to increase hp in my 318? [Re: Moparmad] #2608799
01/18/19 10:54 PM
01/18/19 10:54 PM
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roadrunninMark Offline
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No, Nacho, you still change to KB167 pistons to get the compression up and use .027 head gaskets. The only way to get more CR and use your stock pistons are to deck the block/heads/ and then the intake...way more expensive than just getting the pistons. You can get heads that have the smallest combustion chamber you can find, about 62CC.

True Big Bad Bee, but then you need to ask what transmission is being used. My 318 (original engine) ebody I am building will have close to the "junkyard jewel" setup, but I will be using a strengthened 42RH trans, for the OD gear and the 2.74 first gear. I am planning on a 3.55 rear gear, that will give me the 10:1 spread that is recommended. You take the gear ratio and multiply it by the 1st gear in the trans. You want close to a 10:1.

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