Help me out 6 cyl guys

144-250 cid Inline Six Performance
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lavron
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Help me out 6 cyl guys

Post by lavron »

I am in the contemplation stage, I want to switch my engine from the 170 to a 200 or 250 in my Comet but can't decide a few things.
First the 200 vs 250 I think the 200 is probably a a bit better engine but I like that the 250 uses a SBF bell housing, starter, flywheel (balanced 0) and I could easily bolt a T5 too it, however, I am not sure I like shoehorning it in there especially if I add air eventually. On the other hand I have a pretty good '66 200 short block in the shed but it has the long bell housing ear (that sits below the starter) broken off at the bolt hole, so I would need to find another block. Then I could look for a 80+ 200 from a Fairmont and it has a V8 bolt pattern as well but there is no flywheel that is a bolt on.
Any suggestions to push toward one of these over the other?

See Ya,
Mike
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popscomet
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Re: Help me out 6 cyl guys

Post by popscomet »

the 250 would be my choice...best I recall 200 and 250 have 7main brg's....jmo pop
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lavron
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Re: Help me out 6 cyl guys

Post by lavron »

So I guess I solved that today picking up the '72 200 out the Mav Grabber, my mind is at ease :roll:

Oh yes, now that I have a head with a flat top intake there is new contemplation, my Offy triple won't fit it, so I am thinking of maybe milling the top smooth and adding dual 2V carbs, well because I like to be different.

See Ya,
Mike
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popscomet
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Re: Help me out 6 cyl guys

Post by popscomet »

the best way to be is DIFFERENT..... :lol: 8) my son has a 200 6cyl in his 74 bronco,tuff little motor,,,,,pop
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lavron
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Re: Help me out 6 cyl guys

Post by lavron »

As sit and ponder, because the motor is not in my possession yet, I think it is probably a 170 as well, I used to be smarter than I am now and could tell most any of the little 6 motors quickly (from a lot of junkyard searching for parts) I am out of practice and I think the large log intake got me excited and I did not realize the Maverick came with a 170 :roll: .

All is not lost however because I got the motor cheap and from what I have read the big log, flat top 170 is like the holy grail of the small six factory heads, because it has a smaller chamber size than 200/250 heads meaning it has better compression. I might have to have the valve seats cut for larger valves but it is not an unknown process.

I was thinking about milling the top of the intake and installing two of these http://www.langdonsstovebolt.com/store/ ... ory=361512
They are about the cheapest progressive two barrels I have seen and it says they are designed for 97 cu. in. engines, so two should be about right on a 200.

Anyone know of someplace that could CNC some aluminum plates for me for carb bases? I figured I would leave the original carb mount hole and add a plate with a dam attached to the bottom of it to sort of split the runner and mount new carbs out on either side of the center hole.

See Ya,
Mike
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Adams
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Re: Help me out 6 cyl guys

Post by Adams »

Maybe you already have it, but the Ford Falcon Six Performance Handbook has all the info for about any kind of conversion. I don't know about the late 170's, but most 170's, as opposed to the 200/250 only have 4 main bearings. If I wasn't going original, I'd get a 200. In fact, I have a 200 from a 65 Mustang sitting in my back yard, waiting to replace my 144 if I ever choose.

lavron
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Re: Help me out 6 cyl guys

Post by lavron »

Adams wrote:Maybe you already have it, but the Ford Falcon Six Performance Handbook has all the info for about any kind of conversion. I don't know about the late 170's, but most 170's, as opposed to the 200/250 only have 4 main bearings. If I wasn't going original, I'd get a 200. In fact, I have a 200 from a 65 Mustang sitting in my back yard, waiting to replace my 144 if I ever choose.
Yes I have that book already.

You are correct on the 170 vs 200, 200 is what I was hopping I was buying (and maybe I did, but I don't think so) I gave so little for the engine and the head is worth what I payed plus it will have extra brackets, oil pan, valve covers and the like if I ever need them, I was thinking about this today, I did a a bit of work on my current 170, it had been rebuilt and bored with new pistons etc, even though I did that years ago it does not have that many miles on it, so I can redo the new head I am getting and just use my original 170 block until I find a good 200 block to rebuild, anything I do, like switching out transmissions etc. will go right over on the 200 and the 4 main engine is not in danger of exploding on me, just like the 7 main idea for strength.

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Mike
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lavron
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Re: Help me out 6 cyl guys

Post by lavron »

Got my engine today and it is a 200 cid, I understand after picking it up why I got worried that it might be a 170, the exhaust manifold with the heat box on it is so large you don't get a real good look at the right side of engine.

Any suggestions for treating it for stuck cylinders, I am going to tear it apart anyway but wondered about soaking the cylinder bores with diesel or atf before I do anything else?

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Mike
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lavron
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Re: Help me out 6 cyl guys

Post by lavron »

Look at me drag up one of my old posts from the past, been contemplating and looking for the parts to install my T5, the adapter for the 170 is $190 :( , if I buy that to run the T5 with my current engine I would have to use the smaller flywheel and clutch in the 200 if I put it in later or buy a new adapter :roll:

I am revisiting the 250 scenario, this why, everything on the back of the motor and the starter are SBF, I would just need a zero balance flywheel, I could just get a bell housing for the T5 no adapters required :D

This is the downside, first I don't have one, but that aside, I would have to deal with 2" taller and around 2" longer, I don't think either of those are an issue. Next is parts are fewer than the 200 even, but I think the pistons are the same, cam is the same, crank, rods, timing chain, pushrods, harmonic balancer and water pump are different as well as a unique oil pan, I am sure all of those are available except the oil pan (I need a rear sump pan).

I may start looking for an engine, it can even be just a short block because I have enough heads.

Anybody have any negatives to doing this? Also anyone know if a 250 ever had a rear sump pan?

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Mike
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BJB
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Re: Help me out 6 cyl guys

Post by BJB »

Mike. I have a 200 , 7 main bearings engine in my early Falcon. It is a great engine and I was lucky that it included a 71/72 2 V head. My plan is to fit a 250 that I purchased years ago and then fit the 2V head. This will involve fitting a pusher electric fan due to the length of the 250. Not a show stopper as down here the 250 upgrade is very popular. The 250 is a big torquey Motor and when fitted with the 2V gives the V8 a fright . Bruce
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Rocket989
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Re: Help me out 6 cyl guys

Post by Rocket989 »

I think you're gonna have to weld a 200 pan bottom to a 250 top...no rear sump 250 applications (US anyway) I can think of. Like you noted - they're bigger...taller/ wider. I read at some point like 1.5-2" taller?? That's a lot! Kinda like 302--->351!

Be pretty neat though!!
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lavron
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Re: Help me out 6 cyl guys

Post by lavron »

Rocket989 wrote:I think you're gonna have to weld a 200 pan bottom to a 250 top...no rear sump 250 applications (US anyway) I can think of.
Kinda what I figure.

I don't think the height will make a difference being I have to custom make a pan anyway I can just set the motor a little lower.

I went down this morning and checked the one 250 (in a '77 Maverick)I knew of in the JY, it is still there, I checked, not frozen but there was water in the oil pan, most likely from sitting with no carb and someone leaving the hood up, they wanted $150 for it and I would have bring equivalent scrap cast iron in exchange, that was with me unbolting everything and they just pull it, I passed :roll:

I will keep looking, for $150 it better be a running motor to say the least.

See Ya,
Mike
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