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My 289 was originally equipped with a cast iron water pump. Can I install a '65 aluminum water pump, or will I need to get a different timing chain cover, also?

1965 289 Hardtop
MCA #45799
Mississippi Coast Mustang Club
 

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Nope bolts right up. I have one on the 65 engine that is in my 67. Hey I thought that a coupe of pounds less couldn't hurt.

1967 GT coupe been in my garage since 1974
1993 Ranger ExtCab 4.0L daily driver
1996 Aerostar wifes ride
Those that know it all are willing to learn something new, those that think that they know it all don't know anything.
 

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Does your pump have a backing plate, or is the impeller sticking out the back of the pump. If it sticks out the back then your front cover is extended out and serves as the impeller housing. I was of the opinion that all '65's and hypo (k-code) '66's and '67's had the extended front cover and lacked the backing plate on the pump. These cars would have received aluminum water pumps at the factory. It is highly possible that this switch could have occured later in the '65 model year, I guess.

In either case, aluminum water pumps are available. If your pump has a backing plate that will actually make it easier for you to get an aftermarket aluminum pump. In fact, I've got one I'd sell you. I bought one without realizing that it will not fit my "non backing plate" front cover.

If your pump doesn't have a backing plate, then you are in the same boat as me. I ended up taking mine into the parts store and using it as a core to order a replacement pump for a k-code.

This may be confusing. I know it was to me! If you aren't sure if your pump has a backing plate, you should be able to tell by looking at where it seals to the front cover. The backing plate models go front cover - seal - backing plate - seal - pump...so there will be two seals visible.

Good luck!

Phil

p.s. There is some discussion of this issue at my morepower page:
http://www.blueriver.net/~finite/mopower.htm

'65 Convertible (with many mods.)
http://www.blueriver.net/~finite/Pony.htm
 
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I think it may bolt up, but I believe the cover is not recessed so there may be cleanance/circulation problems with the pump blades and the later cover made for cast iron pump.

1967 S code GT Deluxe Coupe 65B
1966 Convertible 76B 289 4 speed

Descendent of Francois Seguin dit Laderoute,
Soldier Regiment d' Carignan, New France 1665-1668
 

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Just for infoFord startedinstalling the cast iron water pumps during 1965 model production. Change over date was in May 65

Jeff Speegle
MCA Shelby Gold Card

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Mustang & Shelby research, documentation

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The changeover to the cast pump REQUIRED a different timing cover. The '65 style aluminum pump was not as efficient a design as the cast pump/cover. For maximum cooling I would go with the aftermarket aluminum pumps that replace the cast iron pump style.

Scott
National Parts Depot
1965 Conv:Street driven concours
1966 Coupe: Daily driver and toy
 
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