Do I need to mill this head?

[Anonymous]

I read in the FFP handbook about milling the 250 head. I pulled a 200 head off of a 83 Granada yesterday. The book says the valve sizes on all heads are the same after 78. I assume I will not need to mill this head? Is there anything else I need to know in building this head to fit on my 65 mustang 200 that is not in the book?

 

[Bobscoupe]

You will need to mill the head if you want to maintain horsepower. The later models increased the combustion chamber size to lower compression so lower octane fuel could be run and to reduce emissions. In addition the original head gaskets are hard to find and modern composite gaskets are thicker than the original.

You need to mill about .015 if you use the Fel Pro head gasket, which seems to be the most popular here. About .010 for each 2 cc you want to reduce the chamber, ie .050 will reduce chamber size by approximately 10 cc. Don't quote me because I don't remember exactly, I'm sure someone here will but the Granada had about 63 cc and you probably want about 51 cc to maintain original.

Most mill between .060 to .075 from the later model head for use on the early 200 ci engines. I believe I've read that .090 can safely be removed if you want to raise your compression above stock.

Do a search on milling the head it will bring up all the info you need.

Have fun

 

[buzzA4]

Be sure to cc the chambers before you mill. easy to do and the only way to be sure how much to mill. The head may have been milled before and taking it down another .075 may go beyond the limits.

Check out the sticky at the top of the forum on head swaps.

Bobscoupe is right about the milling .010 to reduce chamber by 2cc. You want to end up with a chamber size that corresponds to your 65 engine. You may want to check your engine block deck deck height, too

Botomline is that you want to end up at stock compression ratio. To do this you need to know deck height, if it has been altered; piston dish, gasket compressed height and chamber cc's.

.

 

[Anonymous]

Botomline is that you want to end up at stock compression ratio. To do this you need to know deck height, if it has been altered; piston dish, gasket compressed height and chamber cc's.

.

Okay, how can I tell if the deck has been shaved? I know the engine was rebuilt before I bought it. I don't want to have pistons hitting my valves

 

[wallaka]

Search for CC'ing a head.