iWARNING: 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**23Clark's IMPROVED PISTONSOur Premium Cast, Hi-Tech & Forged PISTONS are made by an original equipment manufacturer who supplies automotive and motorcycle manufacturers. Their factory is QS9000 & ISO9001 certified which means they have passed the worldwide quality standards required to sell directly to GM, FORD, and CHRYSLER, as well as other engine manufacturers. Each batch of alloy is independently tested before casting and then hardened to specs under computer control. The new tooling was specifically made for our pistons and specific machining cams were produced to accurately machine the profile and taper of the piston. All CLARK pistons are sorted and graded by size (+/- .0004") and weight (+/-1.5 grams or better!) so you are assured of perfectly matched pistons no matter which ones you purchase. Even a casual look at our pistons will reveal the extreme quality of the tooling used. Insist on "CLARK" PISTONS. We have cast the letters "GN" inside the piston for your assurance.PACKAGINGCLARK pistons receive exceptional handling. At the factory, right af ter sorting, they are individually put in plastic and packed in special 6 divider boxes. These pistons are treated like the jewels they are! You ALWAYS get the BEST when you order our CLARK improved pistons.CLARK PREMIUM CAST PISTONSPREMIUM CAST PISTONS available for 1961-63 & 64 -69 (exc. SMOG)These are vastly superior to the cast pistons that have been available. The material and workmanship make these almost too beautiful to put in an engine! Large custom production runs allow us to offer a SUPERIOR piston at a lower price. ALL surfaces are more accurately machined, wrist pin holes are bored and honed for smooth operation under all temperatures and conditions. Ring grooves are precision machined, NO SHARP edges or variances. (Pistons are even tin plated .... just like the originals!) Until you see a regular cast piston next to one of these PREMIUM CAST, you can't imagine the amount of difference. Standard size PREMIUM CAST pistons can be mixed with GM pistons. We have compared to the competition and there is NO COMPARISON!CLARK HI-TECH PERFORMANCE PISTONSHI-TECH PERFORMANCE PISTONS available for 64-69 (exc. SMOG)Many import Turbo & high performance engines DO NOT use "FORGED" pistons. They use this special type of HI-TECH PISTON. These are designed to approach "FORGED" piston standards by using a high silicon aluminum alloy that is then heat treated. SUGGESTED for ALL Turbo, 140 & high performance engines or a "BULLET PROOF" street engine.o Special J.I.S. "HIGH SILICON ALLOY" o Profiled and finished using diamond toolingo Hardened to T-6 specs o Sorted in SETS matched by size and weighto Custom fitted wrist pins o Engineered to meet or exceed conventional forged pistonso Shortened skirt . . . precision machining of the profile and taper allows pistons to be more stable in the bore even though they are slightly shorter (stability leads to better ring sealing and LESS WEAR).CLARK FORGED PISTONSClark Forged pistons give you excellent forged pistons. We wanted to produce a superior street/performance quality forged piston and started with new precision tooling to produce the high strength aluminum forging. The forging & controlled machining produces a piston with a perfect fit with diamond skirt machining for superior oil retention/anti-scuffing and critical identical weights. The skir ts are also coated with moly-graphite to also help reduce wear. These will give you a super strong per formance engine.INSTALL YOUR PISTONS CORRECTLY!It is very important that your new pistons be installed correctly. DO NOT support the piston and cold press the pin through the rod. This can distort the piston and creates ridges on the wrist pin that make the pin rotate hard and wear the pin bore. The rods MUST BE heated to just the right temperature and the pin will then just press right through! This will give you a PISTON/WRIST PIN/CONNECTING ROD SET that seem to float in each other and ensures everything will move smoothly from the first turn of the engine. If you DO NOT have CLARK'S install your rods, be sure the Shop DOES use a rod furnace! DO NOT let them tell you it's not necessary! We used to cold press and we have seen the dif ference!ORDER 6 PISTONS CORRECTLY INSTALLED!If you order your pistons and reconditioned rods from us, you'll be ready to go as soon as your order arrives.ORDER C8828R (PRESS ON SERVICE for Set of 6. Must also buy 6 rods and 6 pistons)PISTON FURNACE heats each rod to correct temperature. Heats 2 at a time. THIS TOOL exactly locates the PISTON, PIN & ROD. The rod is heated, put into the position shown and thumb pressure pushes the pin into the correct location.