ICON FHR PISTON BBC SET

Name: ICON FHR PISTON BBC SET
Brand: UNITED ENGINE MACHINE
SKU: 648-IC9981.060
Price: 751.37 USD
Availability: OutOfStock

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Chevy 396/402ci

Dome Top Pistons

Solid Dome .204''
4.185'' Bore (+.090'' 396; +.060 402)
Use w/6.135'' Connecting Rod & 4.000'' Crank Stroke
10.9:1/96.5cc; 10.0:1/105cc; 8.9:1/119cc Compression Ratio
8/pkg.

Notes: Designed to use a 396 block with a 454 crankshaft. Centered pin. No mini grooves on top land. For a 396ci engine (4.095" std bore), this piston will be a .090" over bore. Compression ratio will be 10.9 on 96.5 head (Closed chamber head).
Technical Specs:
Alloy: Premium 4032 Alloy
Bore: 4.185'
Crankshaft Stroke: 4.000'
Connecting Rod Length: 6.135'
Deck Height: 9.800'
Compression Height: 1.645'
Pin Size: 0.990' x 2.750'
Pin Location: Centered
Solid Dome Top: .204'; 17cc; 1 Valve Relief (Closed Chamber Design)
Intake Valve Relief: N/A
Exhaust Valve Relief: N/A
Top Landing Height: 0.310' (No mini grooves on top land)
Ring Grooves: 1/16' Top; 1/16' Middle; 3/16' Bottom
Lock Ring: LR984A Round Wire
Gram Weight: 605/141
Compression Ratio: 10.9:1 w/96.5cc Heads; 10.0:1 w/105cc Heads; 8.9:1 w/119cc Heads

Formed Head Relief Design Pistons

The Icon FHR (Formed Head Relief) series are an ''Off The Shelf'' piston loaded with premium features that are usually found in specialty custom made pistons. FHR pistons have valve reliefs that are formed in as the piston blank is pressed into the die. Many of the domed models are solid which allows tailoring the dome height for a specific compression ratio. Forged from 4032 Alloy material containing 11% silicon content which controls the thermal expansion so a tighter piston to wall clearance may be used over the 2618 alloy. The additional silicon wil also increase wearability on the skirts and pin bores making this an ideal material for street and some boosted applications.

Features

Premium 4032 Alloy
Die Formed Valve Reliefs
Top Land Mini Groove Technology Reduces Friction
Diamond Finished Piston Skirts
Second Land Accumulator Grooves Increase Stability in the Bore
Tru-Arc Lock Rings
Spacer rings included in short compression heights that intersect the wrist pin bore
Sold in Sets (except when noted as 1 piston per package)

Click here for reference guide to piston top designs

Part TypePiston

Product LineUEM Pistons Icon FHR Forged Series Big Block Chevy Pistons

BrandUNITED ENGINE MACHINE

Package Height4.0

Package Width10.0

Package Length18.0

Weight15.0 PG

Part CategoryPerformance Parts

Part FitmentSemi Universal

Vendor Part NumberIC9981.060

Package Qty1

Package TypeEA