Pro Copper Head Gaskets (“P” Prefix) Sample Part Number P13524

Recommended uses: Extreme Boost, Nitrous, Blown Alcohol or Nitromethane.

For best results, SCE Pro Copper Head Gaskets should be used with O-rings in the block or head and sealant if liquid-cooled (use Copper Coat, SCE p/n G1612).

Pro Copper HG Instructions

STEP 1 – Before installing the gasket perform a visual check to insure that no damage occurred during shipping. The gaskets should be flat and free of dents or scratches.

STEP 2 – All SCE copper head gaskets are annealed in a vacuum oven after the punching process to provide malleable gaskets that are ready to use, do not use a torch to soften the gaskets.

STEP 3 – Pro Copper series head gaskets (P prefix) require the use of a sealant for coolant and oil passages and o-ring combustion seals installed in the head or block. (P/N 31542 o-ring kit).

STEP 4 – If you are installing o-rings make sure that the o-ring diameter and location accommodate both bore opening and combustion chamber shape. This will determine the minimum inside diameter of the o-ring.

STEP 5 – If the combustion chamber or bore is so large that o-rings must be placed less than .100” apart between cylinders, it is advisable to use a “figure 8” pattern for o-rings (see figure #2). This allows for more even clamp load over the entire head surface.

STEP 6 – Recommended o-ring protrusion is not more than 25% of gasket thickness (see figure 1 below). Wire height in excess of 25% gasket thickness without receiver grooves may cause coolant leaks by supporting the cylinder head too high for proper coolant sealing. Example: Gasket thickness .043”, o-ring protrusion height should be .008” to .010”. This standard works with all thicknesses that are .050” and less. Gaskets thicker than .050” do not require o-ring height more than .012”.

Note: For extreme boost or heavy Nitrous an O-ring-Receiver-Groove arrangement is recommended (see figure 3 below). When using an O-Ring / Receiver Groove setup the wire may be higher than 25% of gasket thickness because the gasket will displace into the groove.

Wire height & width determines receiver groove depth & width by maintaining the relationships in the figure 3 illustration.

STEP 7 – New head studs/bolts are recommended for proper gasket sealing. Threads must be in good condition otherwise replace, a die can be used to remove old sealant and/or rust. Use a tap to clean threads in block. If threads are tapped through the deck, use a proper thread sealant (SCE p/n G1615) to prevent coolant migration up the bolt, silicone sealer is not suitable for thread sealant on bolts as it will shear and leak when heads are re-torqued. If studs are to be used check for proper length so nuts do not “bottom out”. Always use quality hardened washers and thread lubricant to prevent thread galling.

STEP 7 – As with any performance application it is strongly recommended that head bolts/studs be re-torqued. Start the engine and allow it to reach operating temperature without placing any load on the motor. Shut down and allow the motor to cool to ambient temperature (over-night). With the engine cold and following the recommended torque sequence, one at a time back each fastener off just enough to relieve the friction set, then re-torque to specified torque value.


A single wire o-ring between the cylinders allows the head to settle properly on the outlying areas of the block for coolant sealing. Two wires in a very tight area cause the copper gasket to ‘stack-up’ creating a very tight combustion seal but it causes coolant leaks and may warp the head.

Figure-1-O-ring-blockw Fig-3-Receiver-in-headw