GTI-R US
Management
Posts : 8349
Join date : 2012-03-04
Age : 108
Location : DONT KNOW ANY CLUES???
It could be out a tooth as that will certainly make it lumpy and in general the 264 cams wont make the car idle poorly unless they are advanced to the max on intake
You can check exhaust side by ignition timing.........so if that is where the dizzy sits and shes showing 18-20 degrees on the timing gun then you know the exhaust cam is set right, BUT that does not mean the intake cam is set right so only way to check that is by pulling the rocker cover off and physically check the cam position
In general an sr20det will not have valve to piston contact unless the cam timing is out by around 5 teeth, unless the head has been skimmed by a large degree, block has been decked or the valve lift on chosen cams is excessive which isnt the case with the Hks 264s
Also check chain tensioner to make sure that its operating correctly both hydraulicly and manually as we had a car in recently where the mechanical side of tensioner had failed so on lift off the chain went loose so timing was all over the place on run down
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