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![]() i WARNING: Products on this page can expose you to a chemical, which is known to the St ate of California to cause cancer or reproductive harm. **For more information go to www.P65Warnings.ca.gov** COPPER CYLINDER BASE GASKETS These gaskets will slightly lower the compression ratio. They are die cut from copper sheets .020” thick (.005” thicker than stock). They are the same thickness that GM used on air-conditioned engines. Each .010” thickness increase ADDS 1.5 cc’s to the head chamber volume. This equates to an approximate .225:1 compression ratio decrease in a late engine when used in conjunction with our stackable copper head gaskets. We DO NOT recommend the stacking of base gaskets: however, with one copper cylinder base gasket and the proper choice of our head gaskets you can reduce compression to the desired ratio. Note: Actual thickness may vary + or – .002” from listed thickness. GRAPHITE EXHAUST PACKINGS ALL CLARK EXHAUST PACKINGS – individually or in KITS, ARE GRAPHITE! These packings are produced to CLARK specifications and are the BEST packings that have ever been available. GRAPHITE PACKINGS are BETTER because: ● NO bad odor the first 4-5 times you start your engine. ● STRONGER! Steel reinforced graphite is much less apt to crumble or break apart. ● GRAPHITE is much less affected by heat, moisture, oil ● GRAPHITE packings can be made to more exact dimensions and compress for a tight, leak-proof fit. ● SAFER – less apt to leak. ● NO ASBESTOS or other “MYSTERY” material. “PLASTIC” CARB. SPACERS – These were discontinued by GM. We had the material analyzed by a lab with the instructions to give us a BETTER “modern” material without the asbestos. The new material can take MORE heat than the originals and still has good hot and cold flexibility and strength. We now have dies that produce parts so flat that the spacers do not have to be resurfaced (like the originals had to be). It is still suggested you use a thin gasket above and below the “plastic” spacer. CLARK EXCLUSIVE – SEE PAGE 56 Clark’s CRANK SEALS – the BEST QUALITY POLYACRYLATE & VITON See page 3 for correct seal installation. Unlike some seals on the market that are made from nitrile, our regular seals are polyacrylate (as specified by major USA seal manu- facturers). It is more expensive, has a higher temperature rating and better oil resistance. Now we also have bell housing and crank pulley seals that are exactly the same as the original seals but produced with brown Dupont VITON. You can order any of our GASKET OR SEAL KITS with VITON crank seals by just ADDING V to the end of the part number. Crankshaft Seals: 1960-69 ALL BELL HOUSING Original – Polyacrylate VITON Fits in bell housing (be sure to order bell housing gasket C4628) C493 6 oz. C493V 6 oz. CRANKSHAFT SEAL SPACER Needed when a 1964-69 crankshaft is used in a 1960-63 engine. Helps position seal into correct loca- tion on crankshaf t gear. Also use to position seal on new area of any crankshaft gear. C5311 2 oz. CRANK PULLEY – REAR HOUSING SEAL Original – Polyacrylate VITON Common oil leak area C483 4 oz. C483V 4 oz. 7A Oil Dipstick Hole Grommet style 1965-69 C96R 2 oz. A solid copper head gasket is far superior to the stock folded steel type gasket. The thin metal edge of stock gaskets can result in hot spots that cause detonation and burn through. The not uniform thickness of steel gaskets will deform the gasket surface of your aluminum heads. With solid copper you have a uniform pressure between the cylinder and head that provides a reliable seal without hot spots. Our copper gaskets are good for stock through +.060 overbore. Due to lower octane levels in the fuel available today, some pinging in the hi-performance and turbo-charged engines is being experienced. In order to simplify a minor reduction in compression, we offer gaskets .010” thicker than stock (.042”) and .020” thicker (.052”). These head gaskets are also ideal to compensate for cylinder head resurfacing when no compression increase is desired. In many cases, .030” or more is required for a good cleanup. Due to the solid copper design you can “stack” these gaskets two high and mix or match the two thicknesses to acquire the head volume desired. This practice is also helpful when putting a turbo on hi-performance heads. Many people overlook the fact that increased bore sizes also increase compression. These copper gaskets are made from the correct grade of copper. Note: Actual thickness may vary + or – .002” from listed thickness. INDIVIDUAL GASKETS & SEALS Crankcase Tube thru Bottom Shroud 1961-62 Grommet – not exact but works good. C10046 4 oz. Right Rear Shroud below Distributor 1960-69 Heat switch wire goes thru it. Exact Repro. C1278R 1 oz. Left Front Shroud where Wire Goes to Thermister All 1962-66 Spyder & Corsa Head temp sender unit. Usually brick hard if old. Exact Repro. C1278R 1 oz. Right Shroud Where Smog Pump Tube goes thru 1968-69 Next to distributor. Discontinued Oil Dipstick Hole Boot 1960-64 All C95 2 oz. COPPER HEAD GASKETS ![]() |
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