Short water pump for even fire 231

I am replacing an odd fire 225 with an even fire 231. The water pump is longer for the even fire. I heard you can use a pump from a '72 (?) Buick 350. Has anyone got experience in this area? What about pulleys? I only have an alternator. Thanks.

 

Use the odd fire 225 pump. 72 350 has a mid length pump they may not be right

 

Thanks to both of you.

What is implied by alec296 is that the internals of the 225 and the 231 even fire 1980-87 water pumps are the same, relative to the gasket face. That is great news, means I just swap the pump and pulley and go, when putting in the newer engine.

The drawing from The Wizard makes me a little concerned, just because the impeller is sticking out different amounts in the images. I will look more closely on my desktop later.

Thanks

 

225–231.300.340,350 all same timing cover. So yes it’s a direct replacement. Impeller should all be same.
Just remember to use the even fire distributor.

 

Yep, can see that now on my desktop. Great info, thanks for the help.

 

So, I measured my 225 pump. 3 3/4”, between the short and medium. Belt lines up fine, just wondering why it isn’t at 3 1/2” the drawing shows.

 

That’s odd, if it lines up it should be at specs. But if it lines up , run it.

 

Just under 1/2”.

 

Maybe, but new replacement pump was the same. Maybe TA measurements were approximate?

I am not currently concerned, just curious.

Thanks for both of your input and help. Cross off that concern.

Off topic, to post again later, but do you know of used shorty headers for a 231?

Thanks,
Chuck

 

https://www.novak-adapt.com/catalog/headers/buick-90-degree-v6-headers. These are for Jeep but may work.

https://www.summitracing.com/parts/...MIspjbufjr6AIVKYlbCh1jpgBUEAQYASABEgLoHfD_BwE.

https://www.summitracing.com/parts/...MIspjbufjr6AIVKYlbCh1jpgBUEAQYBSABEgJ3nfD_BwE
Don’t use the crossover .
The even fire is around 7.7 compression. Mill heads around .035-.045 for around 8.3 compression it will have more torque similar to the 225 had.

 

The Novak headers would be perfect, assuming there would be room for the connecting pipe to curve away from the shift shaft to the transaxle behind the engine (914). Probably is. Thanks for the tips. Need to finish rewiring and radiator move to rear before working on replacing the odd fire with even fire. Headers will interfere due to the higher port even-fire turbo heads the new engine will have.

I was told that the stock even fire turbo long block I bought was 8:1, but could be 7.7. The engine was in good shape, just blew a head gasket with the turbo. I was planning to put in N/A 8.5 pistons, but thought maybe I could stay with the 8:1 pistons and mill the heads like you suggested. Heck, they might need it anyway if the head gasket wasn't sealing. If 35-45 mils got me about a half a point, I might go that route. But I intend to put in a lumpy Comp Cams camshaft and need to check on piston to valve clearance before I commit to milling that much. And then I need to mill the intake right. Again, thanks for the tip.

 

Any pics of your build/engine/car?
Its cool your hot rodding the Buick V6!
I did that years ago, I didn't know as much as I do now, plus the internet was in its infancy, Kenne Bell was the only game in town for Buick stuff, and it was call on the phone or write a LETTER, HAHAHA remember doing that

 

I just measured an original factory GM 350 short pump at 3-11/16"
Those TA dim's may just be reference to show that there are three sizes.

 

Thanks for measuring an original. Gives me more confidence.