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Old 02-04-2013, 11:45 AM
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Mopar Water Pumps - are there more than 1 length?

Hi, Mopar LA engines, the 318/340/360....do they have more than 1 water pump length? I have a Mopar performance pump sitting here that pushes out the pulley mount 5 5/8" as measured from the rear of the body (mounting surface) to the front of the mounting "cross". My old mid 60's pump is 4 5/8"... a full inch shorter. Not sure what to do here.....I need the shorter pump and my old one is craclked.
Thanks,
Dave

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Old 02-04-2013, 11:59 AM
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Someone just suggested the new pump may be a truck pump, which may be longer? I have no data on what the new pump. Your typical Craigslist offering.....hey at $15 hard to say no.
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Old 02-04-2013, 02:42 PM
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There were two earlier LA water pumps. One is from the mid '60s to early '70s, and is cast iron. The later ~'72-up (longer I believe) LA pump is aluminum. The two earlier pumps have the hose bibs on opposite sides and also use different timing covers IIRC. Once I tried to make a hose to fit an aluminum pump to the earlier radiator and couldn't make anything work.

There's also a late model reverse rotation Magnum pump.
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Old 02-04-2013, 02:55 PM
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Well that is even more options than I have found to date. What does IIRC refer to? The aluminum pump I picked up was off of a Summit 390 HP Mopar performance 360 that was going in a 90's truck. The buyer had to swap on all of his fuel injection stuff so he had ignition, timing cover and pump for a carb engine he could not use. Now I'm trying to use those on my 66 poly 318. Wanting to a) move the rad inlet to the passenger side and B use a better flow and lighter pump. I've always read that the LA pumps and covers are the same as the poly otherwise.
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Old 02-04-2013, 04:15 PM
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"IIRC" = If I remember correctly.

On the timing cover, as long as you don't have the mid '50s to '61 cast iron timing cover, you're OK. The CI cover uses a different water pump than any of the others.

There's one bolt hole that's not on the later timing cover that has to be plugged in the Poly block.
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