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Tractor Pulling Discussion Forum

70 Allfuel HEAD on a G

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7520

01-26-2006 22:11:30




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Can you run a 70 allfuel head and duplex carb on a Division 3 G




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buickanddeere

01-28-2006 07:12:31




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 Re: 70 Allfuel HEAD on a G in reply to 7520, 01-26-2006 22:11:30  
Before the huge custom cast G Jerry heads were made. The 70 all-fuel head seemed to be the answer. Problem is the 70 head still has the long small dia heated ports designed to burn distillate while ploughing the back 40. The 70 AF head also have huge combustion chambers in order to drop compression into the 4 to 1 range. To obtain decent compression the pistons tops will be way past the spark plugs and shouding them even worse than normal. Even with that many hour$ need to be $pent with a welder filling in the combu$tion chamber. Good idea but it isn't practical and gains little to nothing.

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JDGnut

01-28-2006 07:42:13




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 Re: 70 Allfuel HEAD on a G in reply to buickanddeere, 01-28-2006 07:12:31  
I didn't think the 70AllFuel head was much different in CC's than the Styled G head?? There no problem getting the compression up using the Styled head.. especially on a stroker.. Just takes custom pistons or even M&W will work on a non stroker... JDGnut



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buickanddeere

01-28-2006 22:28:30




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 Re: 70 Allfuel HEAD on a G in reply to JDGnut, 01-28-2006 07:42:13  
I hope this puller dyno's the tractor in an otherwise identical state. One with the stock G head, the 70AF head and a Jerry's head. The stocker G head and the AF 70 head will be very similar in HP. At least the G will idle better with the 70 AF head.



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JDGnut

01-27-2006 07:02:41




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 Re: 70 Allfuel HEAD on a G in reply to 7520, 01-26-2006 22:11:30  
NATPA has it listed for Div IV and V... I think the intent was to get more JD's into those Divs.. JDGnut



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