CVO Technical > Twin Cam
TORQUING HEAD GASKETS
HD Street Performance:
The CVO 110 requires a quad ring, 11907, at the base besides the green (OEM are green) orings. If using Cometic head gaskets then follow their torqueing procedure. 42# is the final pull. They do not require retorqueing. 103 and 96" twin cams use a standard oring 11256, same recommendations. If using OEM composite head gaskets follow the factories degree tightening method and again no retorquing is required.
stuart1270:
What I meant by retorqueing is I tightened to 42 lbs without loosening head bolts. Too early to see if it works. If not I will have to do it all over again with all new gaskets.
HD Street Performance:
On a twin cam if they are leaking, base or head there is something wrong. A few examples, the heads were not torqued accurately, one or more of the surfaces were not straight and true, the studs are pulling, the orings on the dowels at the base are doubled up (oh my is this a bad one), proper lubrication of the bolts, and more.
People assume their torque wrenches are accurate. They are not always and even comparing a click stop to a digital will surprise you the stated allowables, + 4% VS +1.5%, if memory serves me right. So when is the last time your torque wrench was calibrated? If it was is the tool of high enough quality to stay put for a while? Personally I have several torque wrenches and use different tools according to the application. I torque heads and torque plates with a CDI digital that was calibrated at the factory last month.
stuart1270:
I used a snap on 3/8 drive torque wrench. I also compared to a clicker type both very very close.
Before you say it I know 2 wrongs don't make a right.
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