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JD A Head question

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N.Y FARMER

11-27-2002 16:10:32




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I have a 1946 allfuel A. My question is will a head off of a 1948 gas A head and manifold fit on my 46 A with no problems. Is there any power gain by doing this? The reason I ask is I have a 48 gas head and I am looking for a little more power..Thanks guys...this website is very helpfull no matter what color you blood is...




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Dave Thuesen

11-27-2002 18:02:16




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 Re: JD A Head question in reply to N.Y FARMER, 11-27-2002 16:10:32  
I have a 1946 A I pull with and farm. I started by putting high compresion Clevite pistons in with a all fuel head. I had around 120 psi compresion. I wanted a little more power. I put a later gas head on it and it raised the compresion to 180 psi. I now have a very strong A, it plays with my 3-16 plow in heavy soils! I strongly recomend if you do this you run the COLDEST plug you can, and run some octane boost with lead additive. Believe me I had many post here at yesterdays tractors tring to resolve this problem..I give many thanks to the knoledgble people here that helped me diognos this problem. I also would recomend having your distributer recurved by Motec if you have one. Preignition is one of the worst and fastest ways to ruin a engine, that is somthing to watch for when you start raising your compresion. If you do the modifacations you are suggesting I think you will be very happy. I also had to add a waterpump out of a 60 and a thermostat out of a 350 Chevy to keep my temp at 190 all the time. You can put a thermostat housing off of a 60 on it but you cant put the the 60 thermostat in it because there is a casting in an A block that it will hit. I had a round plate made to put a chevy themostat in it instead, it work great!

Any other questions dont be afrid to ask!

Thanks.

Dave Thuesen

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Lee

12-01-2002 09:10:15




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 Re: Re: JD A Head question in reply to Dave Thuesen, 11-27-2002 18:02:16  
I'd like to know where you got those Clevite pistons from. Thanks.



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Dave T

12-03-2002 12:48:15




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 Re: Re: Re: JD A Head question in reply to Lee, 12-01-2002 09:10:15  
I got the pistons from Don's Diesel. I think he is out of Kansas. Sorry, thats all I can remember with out seaching for a reciept.

Dave T.



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Ron

11-27-2002 17:13:22




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 Re: JD A Head question in reply to N.Y FARMER, 11-27-2002 16:10:32  
I am not sure there are any advantages to the '48 head... The main difference is in the compression ratio, and that changes with the change of pistons---from All-Fuel ( Low Comp ), to Gas--or--LP..... .( High, and Higher Comp ). Once the head is off...you are 1/2 way there, to changing the pistons...IF the Cylinders are not too badly worn...



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