Cylinder Head U20
Datsun Roadster U20 Thicker Graphite Head Gasket .120
1st photo. Nissan stock graphite gasket on the left, New thicker graphite gasket on the the right.
No longer necessary to purchase, difficult to seal, all copper head gasket, messy and marginal double head gasket method to compensate for overly planed cylinder head castings. Have you priced out a new U20 cylinder head these days? How about $1800.00. None of these choices are really an option, except for the new cylinder head which may not be in your budget. We have a affordable option!
This all new gasket is .120 thick compared to the Nissan stock gasket which measures .053 at the fire ring.
Why buy a thicker head gasket? During a U20 cylinder heads lifespan it can be surfaced many times to the point where the head is nearly unusable. If your head has been overheated and warped it requires either oven straightening, expensive, or a re-surfacing of both sides of the head in order for it to be flat again. Because both sides need to be surfaced the head becomes thinner. Customers and shops often correct the reduction in overall head thickness by piling cam tower shims under the towers to "get the chain tight". The problem is that this can affect the geometry between the cam and the rocker arms. Yes, this can be corrected with different U20 custom retainers that accept taller L-series lash pads of various thickness. Even with a custom retainer package this still does not solve the problem of diminished chamber volume on the head gasket side resulting in higher compression and detonation.
This new gasket gives you the opportunity to correct the issue of a overly planed cylinder head by putting the height back where it was removed. Use this in conjunction with our cam tower shim sets to get the right combination.
Breath back life into your cylinder head! Comes with a detailed instruction sheet and great front timing cover/oil gallery sealing information.
We recommend that you purchase a tube of the special silicone we sell part#2402 to help seal the front timing cover area and the rear oil gallery of the cylinder head gasket
Gasket construction and properties: High performance graphite facing, much like the Nissan stock gasket, on a perforated carbon steel core. Stainless steel fire rings installed at each bore. Graphite has excellent sealing, conform ability and high temperature resistance.
NOTE: We highly recommend our U20 performance stud kit as it is superior to the original head bolt kit.