Head swap questions,torque specs?

[Anonymous]

I am installing the head off of a 250 onto a 200, what are the torque specs?
I have read the sticky on this swapbut it doesnt tell you what head gasket to use (the 200 or the 250)? The 250 is from a 69 and the 200 is a 67.
other than the carb differences Is there anything else I should know before doing this?

 

[Anonymous]

ANYBODY????????

 

[wsa111]

Steve, read davids & dennis's book on ford recommendations.

I believe your best head would be from a 77 up, this gives you hardened exhaust valve seats & a 1.75 intake valve.

To use this head on your 200, you will have to mill atleast .060-.080 to get your combustion cc's down to atleast 50 cc's.

To use the 69 head little will be gained.

Maybe david or dennis will chime in.

What ever head you use get ARP head bolt studs & torque them down to 70 ftlbs. Do not use stock ford head bolts or you will be replacing the head gasket again. If you can't afford the ARP's, put hardened washers under the head bolts so they don't bottom out.

Also if you use the ARP head bolt studs, shorten the forward rf stud to prevent water pump impeller interference, about 1/8 " will do it. William

 

[mugsy]

I put a '77 250 head on a '66 block. Here are some of the "details" that I foudn with this swap. The earlier 250 head might be the same as the 200, so this is more of a heads-up.

1) The temp sender was different. The later sender had a smaller diameter post (so the wire wouldn't attach) but the threads were larger.

2) The T/stat housing was different. The bolt pattern is the same but the 250 had a larger upper rad hose diameter.

3) I ended up milling about 0.040 off the head to get is to the 52 cc range.
Luckily my machinist did the work on an Saturday and he allowed me to cc head in the milling fixture. He would take 0.010 off and I would cc while he did some other task.


Other than that is was a direct swap. I used factory head bolts, but have less than 5 hours on the engine. So I don't know about the APR studs vs. factory head bolt issue. I did use washers under the head bolts.

 

[addo]

I've had several original head bolts neck and fail on one motor only.

The final torque might be 75 but you go up in two stages first (55 and 65), allowing a minimum of 20 minutes rest between each. Preferably overnight between the second and final settings. Threads must be clean and oiled, including under the bolt head.

The 250 and 200 use the same head gasket.

Cheers, Adam.