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706 gas head on a 560?

A

Anonymous-0

Well-known Member
Casting vs casting...is a 706 gas head with canted valves going to make any more hp on my 560 than the early factory gas head that is already on there? Are there any differences in the combustion chamber?
I will CC and mill so that I can bring the compression up to or as close to 8-8.3 to one as possible. C urrently the tractor has a fresh(er?)set on MW"s in it (im told) but only an ever 120-125 pounds of cranking pressure. Would like a few more ponies, and putting 89 gas in it does not bother me one bit.
 
If the 560 has step head pistons it may not fit. I found a 656 head for my 560 but the smaller not full diameter combustion chamber it has would not have the clearance needed. It would have more hp because the ports are larger and the valves bigger. An early 706 may fit but you need to see what pistons are there and if there is clearance. It would bolt on though if it has the space. There is I believe six casting numbers that all are the same configuration, Good luck in your search.
 
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