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#2607836 - 01/16/19 08:57 PM Re: best way to increase hp in my 318? [Re: Moparmad]
roadrunninMark Offline
top fuel

Registered: 11/25/03
Posts: 2126
Loc: GA
The hotrod article for 400hp 318 is "junkyard jewel". Here is the link... https://www.hotrod.com/articles/318-small-block-build/

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#2607846 - 01/16/19 09:21 PM Re: best way to increase hp in my 318? [Re: Moparmad]
TC@HP2 Offline
master

Registered: 01/23/03
Posts: 4941
Loc: Pikes Peak Country
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.

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#2607999 - 01/17/19 09:05 AM Re: best way to increase hp in my 318? [Re: Moparmad]
Supercuda Offline
I want my mommy!!

Registered: 09/04/07
Posts: 14477
Loc: up yours
302 heads, mid 85 release, where small chamber, high swirl and tumble LA heads
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#2608022 - 01/17/19 09:46 AM Re: best way to increase hp in my 318? [Re: Moparmad]
TC@HP2 Offline
master

Registered: 01/23/03
Posts: 4941
Loc: Pikes Peak Country
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.

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#2608027 - 01/17/19 09:54 AM Re: best way to increase hp in my 318? [Re: Moparmad]
Moparmad Offline
member

Registered: 01/07/19
Posts: 42
Loc: Texas
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


Edited by Moparmad (01/17/19 09:55 AM)

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#2608042 - 01/17/19 10:28 AM Re: best way to increase hp in my 318? [Re: Moparmad]
fast68plymouth Offline
I Live Here

Registered: 01/20/03
Posts: 11687
Loc: So. Burlington, Vt.
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 Plymouth Satellite, 383, stock 906's, 3550lbs, 11.18 @ 123, 1.51 60'
WD- Comp Cams / Indy Cylinder Heads

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#2608047 - 01/17/19 10:37 AM Re: best way to increase hp in my 318? [Re: Moparmad]
Supercuda Offline
I want my mommy!!

Registered: 09/04/07
Posts: 14477
Loc: up yours
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.

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#2608121 - 01/17/19 12:45 PM Re: best way to increase hp in my 318? [Re: Moparmad]
moparborn Offline
super stock

Registered: 07/05/07
Posts: 725
Loc: Pa. U.S.A.
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).


Edited by moparborn (01/17/19 12:46 PM)

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#2608582 - 01/18/19 11:24 AM Re: best way to increase hp in my 318? [Re: Moparmad]
roadrunninMark Offline
top fuel

Registered: 11/25/03
Posts: 2126
Loc: GA
TC...actually my link is a different article than posted in reply #3. Completely different test with additional information.

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#2608662 - 01/18/19 01:53 PM Re: best way to increase hp in my 318? [Re: roadrunninMark]
NachoRT74 Offline
master

Registered: 08/14/07
Posts: 5253
Loc: Caracas, Venezuela, SouthAmeri...
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 ?

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#2608745 - 01/18/19 05:21 PM Re: best way to increase hp in my 318? [Re: Moparmad]
Big Bad Bee Offline


Registered: 12/22/03
Posts: 10849
Loc: Spokane, WA
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.
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It's not a hobby. It's therapy.

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#2608768 - 01/18/19 06:32 PM Re: best way to increase hp in my 318? [Re: roadrunninMark]
TC@HP2 Offline
master

Registered: 01/23/03
Posts: 4941
Loc: Pikes Peak Country
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.

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#2608799 - 01/18/19 07:54 PM Re: best way to increase hp in my 318? [Re: Moparmad]
roadrunninMark Offline
top fuel

Registered: 11/25/03
Posts: 2126
Loc: GA
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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