All Small Six Max safe bore l6 200

[ScottGibs]

I got a reman ford l6 200 engine for my late wife 1964 mustang. Doing a full restore. Old eng was junk someone put in. S&j eng sent me a engine with 60 over piston and rings. Sitting in a 66 block and 69 heads
Is this engine safe at 60 over?

 

[ScottGibs]

I got a reman ford l6 200 engine for my late wife 1964 mustang. Doing a full restore. Old eng was junk someone put in. S&j eng sent me a engine with 60 over piston and rings. Sitting in a 66 block and 69 heads
Is this engine safe at 60 over?

 

[Invectivus]

I was going to do 60 over for my first full engine build as a test, but I think it just depends on the block. I'd like to think that a company like that would do their due diligence and check the wall thickness before sending it to a customer, but who knows. All these engines are getting long in the tooth rebuild wise.

 

[bubba22349]

Hi ScottGibs, yes it is .060 over is still good but that's the last oversize for any of the Stock replacement Pistons that are available. However there are a few that have also bored the 200 blocks over even more than that by using other Pistons from different Car Models too. Be sure that the cars cooling system is in good condition also and you should be good to go. Also the 1969 up heads are one of the Larger Log a much better flowing Heads than any of the the 1963 1/2 to 1968 200 Sixes. did they tell you the Combustion chamber CC's? Most of them usually (except for the 1969 & 1970's 170 C9 head) will need about a .070 Milling cut off an untouched Casting to get them down to 52 CC's which gets you back to 8.8 to 1 C.R. Best of Luck on the 1964 1/2 Mustang

 

[powerband]

recommended or not, the 250 Tri-Power in the '61 uses AMC 258 CID 4.2L STD size pistons with an .070 overbore to accommodate the final 3.75" cylinder bore (250 STD bore = 3.68").

... with the bore at @ .070 over, the AMC piston compression height raises it toward the deck .133 . The specs list the pin diameter of the ford at .9122 and the AMC's at .9310 which can easily be accomodated.

have fun

 

[drag-200stang]

I also did .070'' over bore on a tri-power 200, had no problems even at 195 hp and 6500rpm. But do not try and boost it to over 400 hp, it will crack the cylinder bore at the thin spot, which is between the bores.
You will be fine.