GM 3.6L GDI​

JASPER remanufacturing advances include:

• Stronger forged aluminum JASPER-engineered pistons with a smooth, fully-machined, anodized crown, which provides a thermal barrier and reduces carbon buildup.
• JASPER-engineered pistons include additional oil return holes (14 total).  This increases oil drain back by 250%, or greater, to reduce oil consumption and prevent oil rings from sticking.
• JASPER installs a robust two-piece 2.0mm oil ring for improved oil control.  OE uses a thinner, 1.5mm, three-piece design on LFX models.
• Top ring land is profiled to prevent scuffing at higher temperatures.
• An additional accumulator groove is machined into the piston which decreases the pressure between the 1st and 2nd ring land and prevents the upper (compression) ring from unsealing at higher RPMs.
• JASPER supplies an updated valve cover gasket in our JR set to assist in proper PCV operation and to help prevent oil consumption.
• 100% torque-plate honing of the engine block, utilizing a torque plate and specially-designed Grade 10 ARP head bolts.  This provides a cylinder wall geometry that matches the cylinder head as a complete running assembly, for improved ring sealing.
• JASPER-engineered pistons have a wider graphite coated skirt than OE to help prevent dry startup and piston scuffing.
• An improved piston skirt profile provides greater stability in the cylinder bore, reducing wear, and providing better ring sealing.
• JASPER’s piston has a 40% wider piston pin surface area than the original design to improve durability and promote scuff resistance.
• 100% installation of a set screw on the reluctor wheel, which prevents it from spinning on the crankshaft, eliminating timing/runability issues, or even crankshaft damage.
• Chrome nitrided steel top rings are installed for improved durability, heat resistance, and reduced cylinder wall wear.
• Thicker, fluoroelastomer polymer (FPM) coated Multi-layer Steel (MLS) head gaskets are installed to ensure superior protection against gasket leakage. Our gasket is more robust to maintain the correct compression ratio.
• 100% installation of NEW head bolts to ensure even clamp load.
• Block and heads are resurfaced to a 50-150 Rz finish.
• 100% installation of NEW camshaft thrust washers, which prevents camshaft endplay and noise on early-design heads.
• Crankshafts are machined and micro polished to exact tolerances for improved bearing oil clearance and reduced wear.
• 100% installation of NEW nitrided valves for improved heat resistance and reduced valve guide wear.
• 100% live-run tested to verify proper compression, vacuum, and oil pressure.
• 100% tested intake and exhaust cam actuators, to verify proper performance.
• 100% black light leak tested, to ensure the unit is leak free.
• JASPER includes a fuel injection kit, which includes fuel line(s), injector seals, and a high pressure fuel sensor (on the LLT applications), this prevents fuel spray leaks that can potentially lead to a fire hazard. (PTFE Seal Installation/ Sizing Tool sold separately.)