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Tractor Pulling Discussion Forum

Re: john deere 70- 730 diesel

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Brad Vinkemeier

01-09-2013 13:13:17

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Buickanddeere i also was wondering how do u fit 820 or 830 intake valves in a 730 head its darn tight as it is i do not know whe how much bigger the 820 intake valves are and what do u do with the eyebrow on the one side do u just clean it up or do u remove it completely thanks for the information and ideas

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01-09-2013 13:28:51

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 Re: john deere 70- 730 diesel in reply to Brad Vinkemeier, 01-09-2013 13:13:17  
Careful measuring and grinding to remove a minumum of material.

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Brad Vinkemeier

01-09-2013 15:38:48

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 Re: john deere 70- 730 diesel in reply to buickanddeere, 01-09-2013 13:28:51  
By how much bigger are 820 valves over 730 valves

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01-09-2013 18:08:15

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 Re: john deere 70- 730 diesel in reply to Brad Vinkemeier, 01-09-2013 15:38:48  
830 uses 2.075" and 2.605". The 70 uses 1-29/32" or 1.90" and 2-3/8" or 2.375" valves.

So the intake valves will move out 115 thou farther. The exhaust valves will move out 87.5 thou.

Ain't gonna run out of room. Valve size isn't everything. Cam timing, port blending and multi-angle seats are major players. The shape of the intake valve matters too.

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Brad Vinkemeier

01-09-2013 21:00:12

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 Re: john deere 70- 730 diesel in reply to buickanddeere, 01-09-2013 18:08:15  
Yes i know but thanks for the specs i was planning on having that all done also thanks again

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