250ci head on 200ci block

So I have read that the 144 170 200 and 250 heads are interchangeable with the intake manifold only coming off the 250 head. I know you have to check the squish to match the 250 head or mill it to get the compression correct to fit the other blocks. So the question is has anyone done this to the 200 block ? matched or ported the head mildly ? If you have what was the out come ? was it worth doing ? is it a runner or a high strung motor ? How much trouble is it to do ? Pro's / con's. Thanks Tim

All of the small six heads are interchangeable, and non have a removable intake. The 250 head considered a small six as it also has the integral intake log. Advantage of the 250 is that it has the largest intake log, but lower compression. I don't know the exact amount you will need to cut the head, but .040 would be a safe bet with out worrying about hitting any pistons.
Regardless!! STRONGLY suggest you put the early adjustable rockers on any of them. Especially if you mill the head or block.
A non adjustable rocker depends on a go/no go type gauge before they assemble the head. It is "SUPPOSED TO" set the plunger in the lifter in the middle of its travel. They tip/grind the tip of the valve to what the gauge says. The gauge sitting on the valve spring surface (before assembled) and then they grind it to the gauge. The problem with this is, it does not account for any block or head milling,lifter or cam lobe wear, and is only an "educated guess"!!!! You cannot ever beat adjusting the valves where they need to be and not where they SHOULD be.
LOL..Every time I see a set I grab them just for this...early 144's all had them...and will bolt right up on a small six 250 head... get the push rods also..
vic

Thanks Vic, somehow I was reading about the intake on the 250 head being able to be removed, I must have gotten it mixed up with the aftermarket head and the down under head. Going back and looking in more detail I was wrong about it from what I can find. Thanks Tim

Anyone cut the intake off and make a new one that is removable. Or is there any way you can use the later mustang head which i believe is a removable intake design.

Late year Mustang is the 250 head as far as I know it.
Here is brand new Argentina head and intake I just sold/gave away, it will bolt up on our 250, then the next setup is Classic Inline custom aluminum 250 head, which also has a removable intake and will bolt up to ours, then there is the Aussie Cross Flow. But not easily bolted up to our 250. The Aussie Cross Flow also called the Aussie X flow.
I have the Aussie complete motor here, bolted up to the rare cast iron bell and a 65 Econoline C4. I also, have a custom set of headers for it, in addition to the factory cast iron headers. Also a custom Romac dual pulley stainless steel dampener, two fuel injection manifolds and the Weber carb intake manifold. The engine came out of a 65 van and is for sale, also one extra head with the roller rockers and an extra bell housing, can make some one a smoking deal on it...
vic

So does the stock late model mustang 250 head intake come off or not? or is it like the other small blocks?

Is that a GT40 I see in the engine picture ? very cool, Nice looking engine parts also!

Yea, and unbelievable to drive, and I drove it hard to!!!! unreal and best time I've ever had!!!! NUTZ

In regards to having a removable intake on the 250 head, again,, the answer is NO!! (late mustang head),,

here is a copy of my first reply,,,



All of the small six heads are interchangeable, and non have a removable intake. The 250 head considered a small six as it also has the integral intake log. Advantage of the 250 is that it has the largest intake log, but lower compression.

Perhaps to better explain the above. A late model Mustang 250 head is considered a small six head. All small six heads have an integral intake manifold. When it is said "integral" than means it is part of the cylinder head and is NOT REMOVABLE.

The reason I took the time to post the other pictures was to clearly show all the small six heads that I have worked with and know of that have removable intake manifolds. None of them came on a late model AMERICAN Mustang. The Argentina head was pretty wild with the rocker shaft and roller rockers. Both that set and the other set on the Classic Inline head are roller rockers. The purple ones are 1.6 as I recall, and the other set with the bolt girdle is 1.7 I think??? both interchangeable. And also can be used on ours.
BTW,, THNX for the compliments the 2nd one was a customers truck.

VIC