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Valve sizes 650/750 900 1100

Discussion in 'XJ Modifications' started by 82secaturbo, Apr 28, 2012.

  1. 82secaturbo

    82secaturbo Member

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    Anyone know what size valves are in our XJ motors. I hear there are size differences but can't find it anywhere to be sure.

    The reason I am asking is I'm going with a 818cc big bore kit in my 750 block to go into my 650 turbo and I was looking at adding a 900 head with turbo intake cam and a XJ700N exhaust cam from Delta cams (they do a 10% over), but decided to use the 650 head (ported/polished) and Delta Cams, but wanted to add larger valves from a 900 or an 1100. I still may go with the 900 head and turbo cams and have it machined for the knock sensor. The only thing, the 900 head is taller than the 650/750 head and is a tight fit in an already cramped area.
     
    82secaturbo, Apr 28, 2012
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