4.8 Stroker Hypereutectic Coated Piston/Pins/Clips/Rings Kit.
We have decided to share our custom designed Hypereutectic coated pistons and custom file fit rings to everyone else. This was a two year wait to have these produced. You will not find a better piston and ring combo on the market that covers so many applications, such as: Daily drivers, weekend warriors, racing, boosted applications.
We have built many different combos with these from extremely small cam combos to whopper cam combos. The minimum Hp made to date is 350hp and the most naturally aspirated is 428hp. There are no piston to valve clearance issues to worry about unless extreme head milling or high lift/duration cams are used. These pistons feature a 14cc dish designed to run with a 4.060" stroke crank and a 6.125" bushed or pressed connecting rod making 4.8 liters and above. Eagle makes the crank and rods, as well as SCAT makes a great full floating(Bushed) connecting rod.
These are full custom built rings(1.2/1.5/2.5mm) and it shows. When you compare shortblock turning torque and sealing properties there is no comparison. A normal fresh built factory style shortblock will have a turning torque of anywhere from 24ftlbs to 32ftlbs. Our bushed piston and ring package even with the longer stroke takes only 12ftlbs-16ftlbs to rotate and the sealing properties are awesome.
All of this means less wear, better sealing, less drag for much more power. You will need to have a quality machine shop set piston to cylinder wall clearances and deck block accordingly. This kit includes, Pistons, Pins, Clips, and Rings ONLY!!!
Compression ratios will differ depending on deck height, combustion chamber size, bore size, gasket thickness. Do your research on your exact combination. Here are a few example:
Bore-3.905"/Stroke-4.060"/Gasket Thickness-.041"/Deck Height-.000"/Dish-14cc/Chamber Volume-63cc=10.33:1
We prefer the following Piston/Ring clearances:
(Street) Wall clearance: .002"-.003"/Rings: Top .0018"-.0021" Second .0018-.0022"
Scrapper .0015"(Minimum)
(Race) Wall clearance: .003"-.005"/Rings: Top .0021"-.0024" Second .0022"-.0026"
Scrapper .0015"(Minimum)
(Boosted) Wall clear: .003"-.006" /Rings: Top .0022"-.0026" Second .0024"-.0028"
Scrapper .0015"(Minimum)