inline6 Posted May 18, 2010 Share Posted May 18, 2010 My cam calls for 1.680" installed valve spring height for intake and exhaust. I mocked up one intake valve and one exhaust valve assembly to check approximate installed height. The intake was 1.660" with the .039/.040 shim that was there with the stock spring set-up. The exhaust was 1.690" with it's same size shim. Since I am about to hand the head over to a shop to do a valve job, I'm guessing that these measurements are not meaningful yet - and obviously they can vary a bit for each valve, though the last engine builder likely set all of the intakes and exhausts at similar respective depths. When the next shop recuts the seats and refaces the valves, the installed height will change... How much can I expect the installed height to change (approximate given no odd issues with seats) with a valve job? Should I just wait until I get it back and then order appropriate size shims as necessary? Also, I have attached a picture showing the top of the guides where the seal goes on. The intake and exhaust guides are different. Looking at the invoice I was provided with when the engine builder last rebuilt the head, he indicated that he installed and sized 6 exhaust valve guides - "nissan comp". I am assuming the intake guides were not replaced - are stock. Can anyone tell by the picture? What valve seals do I need to acquire? The cam has .550" lift... From looking through forum posts, it seems a lot of people go with "A-series" seals. Additionally, some people use Ford Capri seals... I'm fairly certain my previous engine builder used neither and not stock L series either. I want to say he used BMW seals? "Goetze" I think. Has anyone used those with success? Year? Model? If the answer is go with the Capri or A series seals, will they fit both the stock intake guide and "comp" exhaust guides? Or is there some kind of compatibility issue with certain seals needing to fit certain valve guides -- I mean outside of being the correct diameter? Quote Link to comment Share on other sites More sharing options...
inline6 Posted May 24, 2010 Author Share Posted May 24, 2010 Bumpy... Anyone? Do the valve job, then measurements for installed height is most likely the answer to the first question. If I go with the ford Capri seals, will they fit both types of valve guides that I have? Anyone used Goetze BMW seals? Quote Link to comment Share on other sites More sharing options...
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