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John Deere Tractors Discussion Forum
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JD 70 Head work

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bassndeere

01-23-2007 18:43:19




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Any body recommend a good machine shop to rebuild/port 2 cylinder heads for pulling.
thanks




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GPULLER

01-24-2007 08:18:50




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 Re: JD 70 Head work in reply to bassndeere, 01-23-2007 18:43:19  
I'll try to help you get the answer you're asking for, since you were not asking about traction, speed limits, or black dash 720's.
Not sure where your located but I have heard good things about this place. They do all makes and they have a flowbench.
http://hittmotorsports.com/index.html



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bassndeere

01-26-2007 18:25:54




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 Re: JD 70 Head work in reply to GPULLER, 01-24-2007 08:18:50  
Thanks for all the advice. Hitt's Motorsports seem like good people.



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DSK

01-23-2007 20:48:49




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 Re: JD 70 Head work in reply to bassndeere, 01-23-2007 18:43:19  
There's been a lot of talk on this board lately about winning tractor pulls in low gear or even victorious creeper gear tractors. This may be true in local competition, but the fact of the matter is tractors that have enough juice to maintain 3.5 MPH (NATPA div. 3 speed limit) the length of the track or until they spin out will come out on top every time. There are JD G's& 70's out there that are capable of taking the load out the gate at 7500lbs in second gear with full cut tires and never going over 900rpm. Thats why most clubs have imposed speed limits for differant classes of tractors, it caps the HP race somewhat. No doubt, tires are still a major part of the total equation, but things have evolved enough in the engine room to outrun even the best set of tires. It is expensive to build and ride one of these beasts,but in this day of $20000 Harleys? All depends how you want to spend your daily bread.

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buickanddeere

01-23-2007 19:46:51




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 Re: JD 70 Head work in reply to bassndeere, 01-23-2007 18:43:19  
Start off with 720 blackdash or later heads. The first three items to address in order to win tractor pulls is traction, traction and traction. If the engine doesn't stall in 1st gear then it has enough HP.



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