Re: NOS 318: What to do?
[Re: 71birdJ68]
#1393557
02/25/13 10:32 PM
02/25/13 10:32 PM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
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Quote:
I would say first find out if that is an industrial motor or one that went in a car or truck. There might be differences that would keep some things from working with it.
I am completely unfamiliar with industrial 318s, but that is a possibility there could be differences. If it turns out to be a normal car/truck engine I would plan on replacing the valve springs since some have been sitting in a closed/compressed position for 26 years or so. An edelbrock performer 4 barrel intake and carter afb or tquad (AFB is easier to rebuild IMHO) can both be picked up cheap on ebay. Combined with an edelbrock performer cam (match springs to cam) or summit racing equivalent would be a great motor in a light car for not a lot of money.
Just noted you said four speed. You'll need to check out the pilot bushing bore in the end of the crank to make sure it will work with your 4 speed input shaft. It may not be finish machined for one, or in the case of my 360 it was drilled too far off center, in that case you'll have to pull the crank and take it to a machine shop. Or cut a small amount off the input shaft and use a conversion pilot bushing that sits in the torque converter bore area.
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Re: NOS 318: What to do?
[Re: waguy]
#1393560
02/25/13 10:58 PM
02/25/13 10:58 PM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
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An intake and cam will go a long way for you. No need to go overboard on either since a stock valve 318 won't move that much air. A common performer intake should be fine instead of a pricier Air-Gap or RPM manifolds. Do those couple of things without having to get majorly into the internals and enjoy the heck out of it. One more thing, check out the oil pan style. If it is a truck motor it will require changing to a passenger car pan, also cheap to pick up at a junkyard or ebay. Not to disrespect the 318 crowd, but if you reach a point where you want bigger valves and higher compression pistons etc, sell off the 318 and start with a LA or Magnum 360 as a core since originality isn't a concern.
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Re: NOS 318: What to do?
[Re: waguy]
#1393561
02/25/13 11:08 PM
02/25/13 11:08 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Cam change & thermoquad. I'd mod the dist subsystems initial/total(35)/springs/vac adv IN ORDER but that would come when it's up & running
live every 24 hour block of time like it's your last day on earth
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Re: NOS 318: What to do?
[Re: wally426ci]
#1393569
02/26/13 06:35 PM
02/26/13 06:35 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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For things to do: 1.IF YOU DO NOTHING ELSE, recurve the distributor. The stock curve is slow and a simple recurve will really wake the engine up with no other changes. 2. If you have a little more money, add a 4-barrel carb and intake. IT DOESN'T MATTER WHICH ONE! Anything is better than the stock 2-barrel. 273, 318, 340, 360? OK. Q-jet, Holley, AFB, AVS? OKAY! 3. If you have even a little bit more money, swap in a 360 2-barrel camshaft. It's brilliant, you use the stock timing chain, gears, valvesprings, pushrods, etc etc etc. Or any other cam with around 0.400" lift and around 190 - 204 degrees duration. That 318 cam is the wimpiest camshaft known to man. Yet, the 360 cam will work with all the other stock parts and give you a little bump. And the stock springs and low-lift cam will make break-in less risky. 4. To top it off, hook the stock exhaust manifolds up to duals. Again, IT DOESN'T MATTER WHIC! anything around 1 7/8 or larger will help uncork the exhaust. I used to keep the stock single exhaust crossover, then TEE in to it somewhere under the driver's feet to run the second pipe back. Presto! Changeo! you have duals with an H-pipe! Now, to accomplish all of this you need to grit your teeth, put in earplugs and put earmuffs on top of them, because it is ohsoeasy to tell someone else how to spend their cash. But my plan will work. R.
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Re: NOS 318: What to do?
[Re: buildanother]
#1393573
02/26/13 11:39 PM
02/26/13 11:39 PM
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Joined: Oct 2005
Posts: 32 Seattle, WA
waguy
OP
member
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OP
member
Joined: Oct 2005
Posts: 32
Seattle, WA
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I am quickly zeroing in on some great options! Turning the motor over by hand made the rocker arms move the valves so slightly that you have to wonder? The double roller chain is sitting on my shelf. Dodgdays, I have a guy with a distributor machine re-curving one for me as I write this.
Last edited by waguy; 02/26/13 11:55 PM.
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Re: NOS 318: What to do?
[Re: waguy]
#1393574
02/26/13 11:45 PM
02/26/13 11:45 PM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
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Quote:
I am quickly zeroing in on some great options! Turning the motor over by hand made the rocker arms move the valves so slightly that you have to wonder?
If it has never been started it probably has no oil in the hydraulic lifters at all making them very soft.
In addition to my recommendations, I will second buildanother's suggestion about a new timing set. Unless it is some kind of heavy duty engine it probably does have the cam sprocket with nylon teeth. Even just sitting, that nylon has probably gotten brittle after all these years.
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