Would you be interested?

[318willrun]

Do you happen to have one of the later 318 roller motors since you’re going out to 91? Or restricted to hydraulic flat?

Also, how far are you allowed to deck the block and mill the heads before it’s considered performance vs service (wink)? Limited to what comes in a Felpro box, or can you get the slightly thinner (028) Mr Gasket head gaskets? Hone cleanup only? Can treat it to a better hone than factory…or can you do a warranty motor at 020 over?

FWIW, my guess is 17-18 in the quarter…

• I have most the parts that would be used. Been collecting a little while. Yes, I do have a roller 318.
• As far as deck/milling, it would only be done to "offset" thicker than factory head gaskets.
• Hone is as far as I would go.
• My whole thought would be to not "cheat the system"... so to speak.

 

[318willrun]

Find the schematics on the Mexican version 318 - 270 horsepower now that's a horse of a different color

Yes - and I am unfamiliar with the Mex-spec 318. So I'd probably not go there as the LA318 "american... LOL" is the mega-millions motor that moved cars!

 

[318willrun]

And I might as well add... The ONLY thing that wouldn't be "318 car specs" would be the exhaust. I can just about promise you I won't install a new exhaust system on my Duster just to remove it when this project is over LOL.
And YES, 318's DID come with dual exhaust!

 

[Ottmundr]

• The car I have. I would use my Duster, but I can have it weigh what the lightest LA 318 car weighed.
• Car is a auto, so just for this project it will stay auto
• What I CAN'T do, is swap parts within the parts. For example, i cannot pull 1.88 valves out of a 360 head (yes, 318's came with 360 heads) and install them in 302 heads. So no swapping even springs in distributors. But, I can use any distributor I want from a LA 318

featherduster sheetmetal?

Oh, and subscribed!

 

[318willrun]

featherduster sheetmetal?

Oh, and subscribed!

feather duster's were slant cars

 

[sr71mopar]

We were thinking about putting this mostly original 1967 318 with 920's and a steel crank in the car and see how good it gets around. With a thermoquad and dual exhaust It might run pretty good.

 

[Ottmundr]

Just the mention of "318" brings drama. Don't know why, the most offensive word that can be used here besides.... (shall I say it??.... naw, i won't)

318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318 318

 

[273]

I'd watch it but the premise seems too restrictive there's not much differences between 318's over the years.

 

[318willrun]

I'd watch it but the premise seems too restrictive there's not much differences between 318's over the years.

The idea is to see what a LA 318 could run the 1/4 mile as a 318 - but using what may be considered the "best pieces" of the LA 318

 

[nutz]

so best of the best 318 oe parts sounds cool what year you think had the hotest cam ,would most of the parts be sourced from one year for best performance
only a couple had 4 barrels

 

[318willrun]

so best of the best 318 oe parts sounds cool what year you think had the hotest cam ,would most of the parts be sourced from one year for best performance
only a couple had 4 barrels

I have almost every part already.

 

[DFX 340 Duster]

Was there anything special about the 318 in the Duster Twister?

 

[harrisonm]

Very interesting. You could also consider using any part that was available from the dealership parts department between 67-75.

 

[318willrun]

Was there anything special about the 318 in the Duster Twister?

Not that I'm aware.

 

[318willrun]

Very interesting. You could also consider using any part that was available from the dealership parts department between 67-75.

That would take some research. I think six packs were even at dealership parts department? They certainly would have a direct connection ordering book??

 

[Mtrhead]

1967 318-3 truck engine....takes some sourcing but worth the coin...Beast

 

[Swingn’71]

Let’s just “say” it’s 1970 and you stroll into the local Plymouth dealer. You then order up a duster 318 3 or 4 speed stick. Could you not check off you want 3.91 sure grip on the option list ?? I think you could..!! Not fact of course. Just spit balling here..Swingn’

 

[George Jets]

Like the idea.

You say you have a roller 318.
9.2:1 cr engine.

'89 - '91 > have never floated the valves on the 318 stock build Roller (with a 4 bbl on the stock mid rise, large plenum, original TBI intake that the runners match the 318 head ports of those years).

Stock roller cam handles the extra fuel from a 4 bbl just fine too, so believe the stock roller cam will fit the bill regardless of carburetor selection. One of the Stock '89 roller 318s even had the fuel pump eccentric pre-installed behind the mechanical fuel pump block off plate.

On the other hand, have floated the valves on a stock 1976 360 (with a 4 bbl) in a D100 truck, same truck the 1st 318 roller went into.

Possibly the larger 360 valves were heavier, and fatigued springs from 1976?

Moving forward 13 years to the '89 318 Roller, better spring metallurgy and better matched for the roller valve train (the roller pushrods are shorter). Pushrod large holes in the heads, provide no pushrod rubbing the head at high rpm.

Kind of looking like the roller engines have a lot of the stock components that you are outlining in your 318 stock build.

I am sure @318willrun will find a way to extract more power and more rpm within his guidelines. Along with matching specific components in his Duster driveline to work with the intended use of the build.

Yes > Do the Build...


☆☆☆☆☆

 

[George Jets]

May be interesting to see what can be squeezed out of a stock build LA 318 flat tappet, hydraulic cam engine, with the stock open chamber heads, as a comparison with the desired stock build parts.

_________________

Would think the '68 - '69 stock bore 9.2:1 flat top valve relief pistons and the lighter free floating rods would be fair game on the LA 318 build.

☆☆☆☆☆

 

[Darter6]

Cast/TQ?

Just the mention of "318" brings drama.

The same as when you say 4 door.

For example, I know 318 cars came with 3.23's. Did ANY car, I repeat "car", come with anything better from the factory - for a FACT ??

Depending on the year 60's thru 70's some could be ordered. I got a 65 Belvedere with 3.31 that I didn't even know existed.

And YES, 318's DID come with dual exhaust!

1974 Roadrunner 318 2 bbl dual exhaust. I think 73 too. A buddy bought a 74 new. 74 318 rated as 150 hp but the dual's was 170 hp

Was there anything special about the 318 in the Duster Twister?

Nope just a trim package.

Could you not check off you want 3.91 sure grip on the option list ??

I believe you could.Working at a Dodge dealership back then a customer ordered a 70 Dart 318 3 speed floor shift with 3.91.

 

[318willrun]

Like the idea.

You say you have a roller 318.
9.2:1 cr engine.

'89 - '91 > have never floated the valves on the 318 stock build Roller (with a 4 bbl on the stock mid rise, large plenum, original TBI intake that the runners match the 318 head ports of those years).

Stock roller cam handles the extra fuel from a 4 bbl just fine too, so believe the stock roller cam will fit the bill regardless of carburetor selection. One of the Stock '89 roller 318s even had the fuel pump eccentric pre-installed behind the mechanical fuel pump block off plate.

On the other hand, have floated the valves on a stock 1976 360 (with a 4 bbl) in a D100 truck, same truck the 1st 318 roller went into.

Possibly the larger 360 valves were heavier, and fatigued springs from 1976?

Moving forward 13 years to the '89 318 Roller, better spring metallurgy and better matched for the roller valve train (the roller pushrods are shorter). Pushrod large holes in the heads, provide no pushrod rubbing the head at high rpm.

Kind of looking like the roller engines have a lot of the stock components that you are outlining in your 318 stock build.

I am sure @318willrun will find a way to extract more power and more rpm within his guidelines. Along with matching specific components in his Duster driveline to work with the intended use of the build.

Yes > Do the Build...


☆☆☆☆☆

My roller engine is '85

 

[furrystump]

Why a forged crank? It weighs more than a cast crank and your aren’t reaching the limit of the cast piece.

 

[66fs]

Was there anything special about the 318 in the Duster Twister?

No special 318 parts in a Twister. The 318 Road Runner (68 or 69?) had different valve springs and the single plane 273 style intake.

 

[Big.J.007]

I'd love to see a factory 68 69 318 road runner.

No special 318 parts in a Twister. The 318 Road Runner (68 or 69?) had different valve springs and the single plane 273 style intake.

 

[junkyardhero]

i think the name of the game is gonna be optimization. things like utilizing earlier, lighter rods and the later higher compression pistons, 273 mechanical rockers, advancing a stock cam several degrees.

the intake and heads are [mostly] known entity, it'll just come down to preference of big port vs small port, quench head vs open chamber and how you want to approach making power.

it's an interesting exercise no matter the course it'll take.