cannabolic Posted June 1, 2016 Report Share Posted June 1, 2016 hi, hope someone can help me identify the cam on my u67 head. Is this a stock l20 cam? https://goo.gl/photos/gTgdiX3YZsLipCMG7 https://goo.gl/photos/gtjRqm3tUwrQBLPK7 I assume I'll also need to shim my cam towers if head shaved app .063 ( 1,6mm) ? found that u67 should be 4.25 (107,95mm) untouched. measured mine and its 4.187 (106.35 mm). thanks 1 Quote Link to comment
flatcat19 Posted June 1, 2016 Report Share Posted June 1, 2016 Without measuring the lobes, looks pretty stock. Quote Link to comment
datzenmike Posted June 1, 2016 Report Share Posted June 1, 2016 It's a stock cam for an L20B but it looks like it's been re-ground to me. Measure the thickest and thinnest cross section of the lobe. 1 Quote Link to comment
Draker Posted June 1, 2016 Report Share Posted June 1, 2016 It appears to be the stock L20 cam.. unless you see markings on the back of the cam (near the back of the engine) 1 Quote Link to comment
Doctor510 Posted June 1, 2016 Report Share Posted June 1, 2016 Head shaved .060" you will need 3-4 .015" tower shims. As mentioned, look at the back end of the cam, if it has been reground, there should be some info there. The pictures really told us nothing. http://www.ebay.com/itm/Datsun-1970-83-240Z-260Z-280Z-Cylinder-Head-Cam-Tower-Shim-Set-011-/331858609017?fits=Make%3ADatsun&hash=item4d44508379:g:mrEAAOSwFNZWwfdz&vxp=mtr Quote Link to comment
datzenmike Posted June 1, 2016 Report Share Posted June 1, 2016 Jesus 0.060"!!!! That's about 9.3 compression unless the top was shaved also. You would have to cc the combustion chambers to be sure. Does the cam spin freely? Quote Link to comment
flatcat19 Posted June 1, 2016 Report Share Posted June 1, 2016 Last I looked, those shims were also available on Rock Auto. 1 Quote Link to comment
banzai510(hainz) Posted June 2, 2016 Report Share Posted June 2, 2016 Silver Seal sells them also Look like a regrind the back side is cut a lot. You must have new retainers also and big lash pads better get some better photos go to olddatsuns.com Datsun tech and read everything there Quote Link to comment
cannabolic Posted June 2, 2016 Author Report Share Posted June 2, 2016 ok, firstly thanks for all replies! - cam moves freely - measured the cam: 1.165 (29.591 mm) & 1.488 (37.759 mm). Would that make .485 lift (12.31 mm)? - it has "B" & 72 deg stamped on back. 272? - rocker arms have various markings; "s12", "s16", "s80", "s-95","s84","75:" and 2x"5:.", What does that mean? Will measure cc as soon as possible. Only head is shaved and it was bought like this. I have a stock, untouched l18 in my stock 910 good read on olddatsuns! Quote Link to comment
datzenmike Posted June 2, 2016 Report Share Posted June 2, 2016 I think the rocker ratio on L series is 1.48 so 0.178" lift but more than close enough. Quote Link to comment
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