Description
Open-Deck Block Guard
A CNC-machined 6061 aluminium block guard that braces the open-deck D15/D16 cylinders against flex and cracking under high boost.
6061Aluminium alloy
Open-deckCylinder wall support
SOHCSingle-cam D-series
BG-D15/D16Supertech part no.
Overview
The Supertech block guard is a computer-designed, CNC-machined 6061 aluminium insert that fills the gap between the cylinder walls and the outer block on Honda's open-deck D15/D16 SOHC engines. By supporting the top of the highly stressed cylinders it reduces bore flex and the deck cracking that open-deck blocks suffer under high boost or high compression, while still allowing coolant flow through critical areas to avoid destructive hot spots.
For anyone building a turbocharged or high-compression D-series single-cam engine who wants to keep the factory block reliable at power levels where the open deck would otherwise flex and crack.
Specifications
BrandSupertech Performance
Part numberBG-D15/D16
Material6061 aluminium alloy (high strength, high corrosion resistance)
ConstructionComputer-designed and CNC-machined
FitsHonda D-series SOHC single cam (D15 / D16)
Engine codesD15B2, D15B7, D15B8, D16A6, D16Y7, D16Y8, D16Z6, D16Y6 (single cam) - confirm your exact code
Deck typeOpen-deck block reinforcement
FunctionSupports cylinder walls while retaining coolant flow to prevent hot spots
Best forHigh-boost / high-compression D-series builds
InstallationRequires machine-shop fitting - deck the block, install the guard, reassemble with a new head gasket
What's in the box
- One Supertech block guard (single machined piece)
- confirm exact box contents - head gasket, sealant and hardware are not typically included
Fitment
ApplicationHonda D15 / D16
InstallNot a bolt-on part - the block must be decked and the guard fitted by an engine machine shop, then the engine reassembled with a new head gasket.
This is the single-cam SOHC guard (BG-D15/D16) - confirm your block is a single-cam D15/D16, not the dual-cam JDM D16ZC, which uses a different guard (BG-D16ZC).
Best suited for
Turbo D-series builds
High-boost engines
High-compression
A block guard cannot save an already-cracked block and slightly reduces coolant volume at the deck - correct machining and a quality head gasket are essential.
Fast dispatchShips in 24–48h
Genuine productAuthentic Supertech
Easy returns10-day returns, unused items
Fitment helpWe'll confirm before you buy
Returns
Return within 7 days of purchase, provided the item is unused and in its original condition and packaging. Taxes are non-refundable.
We can’t take back parts that have been fitted or modified, unsealed electrical components, ECUs and sensors, opened gaskets, seals and o-rings, or clearance items. Parts we order in specifically for you can’t be returned for change of mind — we’ll tell you before you order if yours is a special order.
If a part is faulty, damaged in transit or isn’t what you ordered, we’ll put it right and cover the return shipping.
Please contact us before returning anything. Full terms are in our Refund policy.
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