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high performance 318 build (on 87 octane) #2581647
11/22/18 06:55 PM
11/22/18 06:55 PM
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
Rapid340 Offline OP
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I dont get to build 318s very often so I thought I would post this link to a 2.5 minute youtube playlist showing the 318 I built that ended up in a 68 B-body. The owner was going to put a 440 in it but decided to stick with a 318 so he could keep his exhaust and the rest of his drivetrain etc. I think he underestimated the cost of the full conversion, he had already purchased a 440 core motor and then went with my 318 and sold the 440.

thanks

https://www.youtube.com/watch?v=XppHo3nPYVU&list=PLtmvPP9_MU2PbOPk_fbOt4gaA-hLXUJR3


1971 Factory Appearing Duster 340 11.000 @ 122 mph
Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2581650
11/22/18 07:01 PM
11/22/18 07:01 PM
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Porter67 Offline
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Nice, but without build specs its like saying go look at the sky, its blue.

So can we get the full build specs?

Re: high performance 318 build (on 87 octane) [Re: Porter67] #2581661
11/22/18 07:47 PM
11/22/18 07:47 PM
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
Rapid340 Offline OP
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The description of the first video clip lists most of details and you can see he is using the stock 318 manifolds. As far as the cam I have alot of time invested in it so I dont want to reveal all the specs but it is a flat tappet hydraulic (even though it is a magnum engine) and has a bit over .500 lift but under 230 degrees of duration. Optimal shift point is right around 6K rpm with 318 manifolds and relatively free flowing muffs/pipes.

Last edited by Rapid340; 11/22/18 08:04 PM.

1971 Factory Appearing Duster 340 11.000 @ 122 mph
Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2581691
11/22/18 09:12 PM
11/22/18 09:12 PM
Joined: Sep 2004
Posts: 2,091
oberlin, Ohio
Rapid340 Offline OP
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As you can see, the tach video is informative (even though it looks like it was not so easy to record) It seems to be pulling decent at 6K on the 1-2 shift. He said he has tried 6500 RPM but it felt spent (what I would expect for the overall combination).


1971 Factory Appearing Duster 340 11.000 @ 122 mph
Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2582013
11/23/18 05:53 PM
11/23/18 05:53 PM
Joined: Feb 2007
Posts: 2,578
sweden
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1Fast340 Offline
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That seems like one fine running 318 you built!

Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2582150
11/23/18 11:38 PM
11/23/18 11:38 PM
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Posts: 3,082
St. Paul , Mn.
tubtar Offline
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318 and 87 octane are not words I would normally associate with high performance.....but the second part of the video seems real enough.
None too shabby.

Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2582187
11/24/18 12:41 AM
11/24/18 12:41 AM
Joined: Jan 2003
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Holly/MI
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I had a Grey & white cat just like that one.
Nice pull to 6k rpm!


R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
Re: high performance 318 build (on 87 octane) [Re: tubtar] #2582191
11/24/18 12:52 AM
11/24/18 12:52 AM
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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Originally Posted By tubtar
318 and 87 octane are not words I would normally associate with high performance.....but the second part of the video seems real enough.
None too shabby.
iagree
Me thinks 318 motors and high performance don't mix well together whistling
Of course a good engine builder can make any motor run well up


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: high performance 318 build (on 87 octane) [Re: Cab_Burge] #2582272
11/24/18 10:01 AM
11/24/18 10:01 AM
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1Fast340 Offline
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Originally Posted By Cab_Burge
Originally Posted By tubtar
318 and 87 octane are not words I would normally associate with high performance.....but the second part of the video seems real enough.
None too shabby.
iagree
Me thinks 318 motors and high performance don't mix well together whistling
Of course a good engine builder can make any motor run well up



Its posts like these that kind of pushes me in the direction of buying a 318 just to prove that everyone else is wrong workYep im one of those stupid ones who likes to do everything backwards fan

Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2582377
11/24/18 02:27 PM
11/24/18 02:27 PM
Joined: Jan 2017
Posts: 274
Granbury TX
Prochargedmopar Offline
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Not sure why people say the 318 isn't a performance engine.
5.2L of high winding power. smile

Isn't it the same bore size as a 4.8 and 5.3?

Good heads, cam, intake and you can run it right up to the bottom end limits no problem.

Who wouldn't love a 500+hp street car?


"Old" member Registered: Sep 2001
Lost my credentials, I'm Back!! LOL
71 Ply Satellite Procharged
73 Dodge Dart Swinger
73 Ford F-100 390/Sniper efi/back to carb
01 Town and Country Limited
08 Dodge 2500 6.7 5" Deleted
02 Mercedes C230K
19 Camry
Re: high performance 318 build (on 87 octane) [Re: 1Fast340] #2582701
11/25/18 03:39 AM
11/25/18 03:39 AM
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar Offline
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Originally Posted By 1Fast340

Its posts like these that kind of pushes me in the direction of buying a 318 just to prove that everyone else is wrong workYep im one of those stupid ones who likes to do everything backwards fan


I don't do Magnum stuff........my notion of a 318 is cast iron 2 bbl intakes and 4 door sedans.
They can make some power obviously , but as small blocks go , they are kind of small. LOL

Re: high performance 318 build (on 87 octane) [Re: Prochargedmopar] #2582716
11/25/18 06:54 AM
11/25/18 06:54 AM
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Bend,OR USA
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Originally Posted By prochargedmopar


Isn't it the same bore size as a 4.8 and 5.3?
[ Moparts Family Site - Keep it Friendly ] is a 4.8 or 5.3?


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: high performance 318 build (on 87 octane) [Re: Cab_Burge] #2582744
11/25/18 10:53 AM
11/25/18 10:53 AM
Joined: Feb 2007
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1Fast340 Offline
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Originally Posted By Cab_Burge
Originally Posted By prochargedmopar


Isn't it the same bore size as a 4.8 and 5.3?
[ Moparts Family Site - Keep it Friendly ] is a 4.8 or 5.3?


GM LS engines. However those (the 4.8 and 5.3) have an even smaller bore than our 318.

Last edited by 1Fast340; 11/25/18 10:55 AM.
Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2582785
11/25/18 01:30 PM
11/25/18 01:30 PM
Joined: Feb 2009
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People's Republic of Mass.
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Belvedere2 Offline
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Always enjoyed my 318. It was a 67 block and heads. The holdover heads from the 273. Smallish ports. Only thing I did to it was add an Edelbrock Performer and Holley 600. Car had great throttle response and got 20odd mpg. Think it had 2" duals with glasspacks. Great cruiser.

Re: high performance 318 build (on 87 octane) [Re: Belvedere2] #2582790
11/25/18 01:47 PM
11/25/18 01:47 PM
Joined: Nov 2009
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St. Paul , Mn.
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Originally Posted By Belvedere2
Always enjoyed my 318. It was a 67 block and heads. The holdover heads from the 273. Smallish ports. Only thing I did to it was add an Edelbrock Performer and Holley 600. Car had great throttle response and got 20odd mpg. Think it had 2" duals with glasspacks. Great cruiser.


Everyone's idea of performance is different I guess.
And that is fine.
But the bar has been continuously raised with the passage of time.
12 second street cars used to be pretty quick.
Now , they're boat anchors.
I have seen some righteous motors in the 300 c.i. neighborhood.......in Competition Eliminator cars. ;-)

Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2582806
11/25/18 02:00 PM
11/25/18 02:00 PM
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People's Republic of Mass.
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Belvedere2 Offline
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True. My point was to show that even a stock 318 can perform. A built engine is even better. My 340 has W2 heads on it. I was always curious how my 318 would run with them. Put some comp and cam in it to see how it would do.

Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2582809
11/25/18 02:04 PM
11/25/18 02:04 PM
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Prospect, PA
BSB67 Offline
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Sounds great!

Re: high performance 318 build (on 87 octane) [Re: BSB67] #2582839
11/25/18 03:19 PM
11/25/18 03:19 PM
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northeast ohio
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mkdart Offline
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Cool stuff Jeff!!!

2014-07-16 19.54.03 (2).jpg
Re: high performance 318 build (on 87 octane) [Re: Belvedere2] #2582840
11/25/18 03:23 PM
11/25/18 03:23 PM
Joined: Nov 2009
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St. Paul , Mn.
tubtar Offline
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Originally Posted By Belvedere2
True. My point was to show that even a stock 318 can perform. A built engine is even better. My 340 has W2 heads on it. I was always curious how my 318 would run with them. Put some comp and cam in it to see how it would do.


We did a durability test with one in a 1967 Coronet.
It was heading to the bone yard and we were bored......a couple friends stopped by with a case of beer and suddenly , it made sense to fire it up and put a brick on the gas pedal.
It ran at W.O.T. for a half hour , until it ran out of gas.
The exhaust manifolds were glowing red and it started spitting through the carb at the end.
My best guess would be valve float causing this.
We were expecting something more dramatic........spitting a rod or some other catastrophic failure.
If the car wasn't so rusty , I could have driven it for another couple years I bet.
If this bit were original , I'd be a genius.....but at the end of the day , engines are air pumps.
The 318 would respond to modifications much like any other motor.
Decent heads would make a huge difference.
400 h.p. would be pretty easy with the right parts and you would still have excellent driveability.

Re: high performance 318 build (on 87 octane) [Re: Rapid340] #2583102
11/26/18 01:57 AM
11/26/18 01:57 AM
Joined: Nov 2006
Posts: 1,074
Manitoba Canada
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Why would you not keep the magnums roller cam?


A new iron curtain drawn across the 49th parallel
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