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Old 12-10-2017, 10:56 PM
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offroadrolls offroadrolls is offline
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Default Mopar question

I just bought the first Mopar in my life. Worked on plenty of them over the years but, never owned one. Anyway what I got is a 1970 W 500 2 ton truck with a 318 in it. The ID tag calls it a 318-3. I've done some research and understand that the -2 or -3 in my case is supposed to indicate a higher level of internal engine quality vs. a stock 318 in say a Dart or something. Any Mopar experts on the forum that can confirm this? And if so, any details as to what's better?
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Old 12-11-2017, 06:33 AM
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smallfoot smallfoot is offline
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From what I've read, I'm no expert but lots of info, the crank is forged and hardened, the blocks are left heavy and the flow on the heads was improved. The motor is a keeper!
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Old 12-12-2017, 07:30 PM
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I don't know Mopar stuff, but medium duty GM trucks of the era had "industrial" engines with forged cranks, heavy 4-ring pistons, specific (low flow) heads, intake manifolds and cooling arrangements... all designed for low RPM/high torque applications and virtually useless in a performance build.

I'd expect your 318 to be similar, given the application... I-R-POPS? MercuryMac?

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Old 12-12-2017, 09:30 PM
phil cottingham phil cottingham is offline
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I thought that in the 60"s and early 70's there were 2 different 318 engines. The ones used in the bigger trucks were a different engine from light truck and car 318's. No interchanging parts. I could be wrong. It's been a few years.
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Old 12-12-2017, 11:02 PM
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I can't answer about the -2 or -3, but I think I had one in a D-600 three ton. It pulled well, even when loaded and it'll be tougher than nails. I, especially liked the New Process five speed trans in the truck. Anyhow, Dodge didn't make a dud motor, ever, so keep it and drive it.

Phil, in the mid sixties, the Polispheric, [ poli for short] 318 was phased out and the LA 318 was brought in. 1967 was the last year for Poli's in pick-ups, and I think 1962 might have been the last year for wide block Poli's in cars as the LA 273 was introduced in '63. I'm guessing at some of this but it explains the stories that you heard about the two different 318's. The two motors look quite different. I'll see if I can find some pictures. Yes, the first one is a Polispheric compression chambered 318 out of a 1966 Dodge pick-up. The second pic is an LA 360 that looks just like an LA 318.
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Old 12-13-2017, 09:20 AM
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Quote:
Originally Posted by MercuryMac View Post
1967 was the last year for Poli's in pick-ups, and I think 1962 might have been the last year for wide block Poli's in cars as the LA 273 was introduced in '63. I'm guessing at some of this but it explains the stories that you heard about the two different 318's.
The 318 Poly A series was used in trucks and passenger cars until 1966. The early '56-61 design has a different bell housing pattern than the later '62-66 version, which used the LA series pattern.
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Old 12-13-2017, 10:28 PM
phil cottingham phil cottingham is offline
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Quote:
Originally Posted by MercuryMac View Post
I can't answer about the -2 or -3, but I think I had one in a D-600 three ton. It pulled well, even when loaded and it'll be tougher than nails. I, especially liked the New Process five speed trans in the truck. Anyhow, Dodge didn't make a dud motor, ever, so keep it and drive it.

Phil, in the mid sixties, the Polispheric, [ poli for short] 318 was phased out and the LA 318 was brought in. 1967 was the last year for Poli's in pick-ups, and I think 1962 might have been the last year for wide block Poli's in cars as the LA 273 was introduced in '63. I'm guessing at some of this but it explains the stories that you heard about the two different 318's. The two motors look quite different. I'll see if I can find some pictures. Yes, the first one is a Polispheric compression chambered 318 out of a 1966 Dodge pick-up. The second pic is an LA 360 that looks just like an LA 318.
Maybe my memory is better that I thought or maybe I got lucky. I worked on a few back in the early 70's but not touched one since. Mostly in older log trucks.
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