Engine Block Parts

What This Category Covers

The Engine Block collection groups the internal and structural components that make up the bottom end and block assembly of a performance or OEM-replacement engine. Coverage spans bearings for rotating assembly refreshes, gaskets and gasket kits for sealing rebuilds, engine mounts for swap and performance builds, and engine bay dress-up pieces for HEMI, Hellcat, and Trackhawk platforms.

Categories Included

Main bearings, rod bearings, connecting rod bearings, engine gaskets, head gaskets, oil pan gaskets, blower snout gaskets, complete gasket kits, engine mounts, polyurethane and billet mount upgrades, block off plates, coolant return plugs, block heaters, PCV valves, cylinder sleeves, engine covers, fuse box covers, radiator cap covers, and billet cap covers.

Bearings and Rotating Assembly

Main bearings, rod bearings, and connecting rod bearings are the most critical wear components in any engine refresh or performance build, controlling oil clearance and load distribution between the crankshaft and block or rods. Builders refreshing a rotating assembly or preparing an engine for forced induction should select bearing clearance based on target horsepower and oil viscosity.

Popular Bearing Brands

ACL Race Series (standard-clearance bearings for street and mild performance LS, K-Series, VR38DETT, and Cummins builds), King Engine Bearings (HP-series tighter clearance bearings for boosted applications above 600 horsepower), and Clevite (OEM-style replacement bearings). Always verify actual clearance with Plastigauge or a micrometer rather than relying on catalog specifications alone.

Gaskets and Sealing

Engine gaskets, head gaskets, oil pan gaskets, and full gasket kits seal the oil, coolant, and combustion passages in both stock-displacement and overbore engine builds. Supercharger and blower snout gaskets are a common Hellcat and Trackhawk specific need due to the high cylinder pressure these engines generate.

Popular Gasket Brands

Cometic (MLS head gaskets, oil pan gaskets, and Hellcat blower snout gaskets rated for high boost) and MAHLE (OEM-style and performance gasket sets). Pair head gaskets with correctly torqued ARP head studs on boosted builds to maintain sealing integrity beyond what factory torque-to-yield bolts can hold.

Engine Mounts and Drivetrain Stability

Engine mounts are vehicle and engine specific, matching the exact frame bracket geometry and isolator design of a particular chassis. Polyurethane and billet mount upgrades reduce wheel hop and drivetrain slop under hard acceleration, improving launch consistency for drag applications and reducing driveline lash for autocross and road course use.

Popular Mount Brands

Innovative Mounts (polyurethane mount kits for Honda and swap platforms), Kartboy (sport compact mount upgrades), and ISR Performance (billet mounts for Nissan applications requiring maximum drivetrain connection).

Block Off Plates, Block Heaters, and PCV Valves

Block off plates seal unused ports on diesel and swap engines, coolant return plugs address Duramax LML rear engine cover leak points, block heaters aid cold weather starting on diesel trucks, and PCV valves manage crankcase pressure and ventilation on gas engines.

Popular Diesel and PCV Brands

Fleece Performance (Duramax LML block off plates and coolant return plugs) and OEM-style PCV valve replacements for HEMI, LS, and Coyote platforms.

Sleeves, Engine Covers, and Bay Dress-Up

Cylinder sleeves support overbore and forced-induction builds that exceed the strength of a factory bore. Engine covers and billet cap covers finish the engine bay on Hellcat, Trackhawk, Charger, and Challenger platforms with functional and cosmetic upgrades.

Popular Dress-Up Brands

Billet Technology (fuse box covers, radiator and oil cap covers, coolant overflow caps, and bypass valve covers), Black Ops Auto Works (carbon fiber engine covers, fan shrouds, and radiator covers for Jeep Grand Cherokee and Trackhawk), and Rebadge Design and Graphics (supercharger badges).

Top Engine Block Brands

• ACL Race Series. Standard and performance clearance main and rod bearings
• King Engine Bearings. HP-series tight-clearance performance bearings
• Clevite. OEM-style replacement bearings
• Cometic. MLS head gaskets and Hellcat blower snout gaskets
• MAHLE. OEM-style and performance gasket sets
• Innovative Mounts. Polyurethane engine mount kits
• Kartboy. Sport compact mount upgrades
• ISR Performance. Billet engine mounts for Nissan applications
• Fleece Performance. Duramax LML block off plates and coolant return plugs
• Billet Technology. Machined billet caps, covers, and engine bay hardware
• Black Ops Auto Works. Carbon fiber engine covers and radiator covers
• ARP. Head studs and rotating assembly fasteners
• Rebadge Design and Graphics. Supercharger and engine badges

How to Choose the Correct Engine Block Part

• Confirm the exact year, make, model, and trim (Hellcat, Trackhawk, TRX, Demon, Redeye, and so on)
• Verify engine displacement and family (5.7L HEMI, 6.2L supercharged HEMI, LS, LT, K-Series, VR38DETT, Cummins)
• Measure actual bearing clearance rather than assuming catalog specifications are correct for your block
• Match gasket thickness to your bore size, especially on overbore or sleeved builds
• Confirm engine mount bracket geometry matches your chassis and engine combination for swaps
• Verify PCV valve port size and thread before ordering a replacement
• Confirm block heater wattage and cord length match your diesel application
• Pair head gaskets with correctly rated head studs on boosted or high compression builds
• Order supporting hardware (ARP studs, sealant, dowels) alongside gasket kits
• Plan for professional machining and assembly on sleeve and rotating assembly work

Common Questions

What engine bearings do I need for an LS build?

For a street or mild performance LS build, ACL Race Series standard-clearance bearings provide a good balance of oil clearance control and value at stock bore. For boosted builds above 600 horsepower, King HP-series bearings with tighter clearances are preferred, often paired with a custom clearance hone.

Are engine mounts universal or vehicle-specific?

Engine mounts are vehicle-specific, matching the exact frame bracket and isolator geometry of a particular chassis and engine. Swap mounts bridge the dimensional difference between factory frame rails and a different engine's mounting points.

Do I need ARP head studs with a gasket kit?

For boosted or high compression builds, yes. ARP head studs combined with a quality Cometic head gasket maintain cylinder sealing at pressures that factory torque-to-yield head bolts cannot reliably contain.

What is a block off plate used for?

A block off plate seals an unused port on the engine block, common on diesel platforms like the Duramax LML where a coolant return port needs to be capped, or on swap builds where a factory port is not used.

How do I know if I need a sleeved block?

Sleeving is typically needed for significant overbore machining or extremely high horsepower forced-induction builds where factory cylinder wall thickness cannot support the increased cylinder pressure. A qualified machine shop can evaluate your specific block.

What is the difference between a gasket and a gasket kit?

A single gasket replaces one sealing surface, such as a head gasket or oil pan gasket. A gasket kit bundles multiple gaskets and seals needed for a complete engine service, such as a full rebuild or a top-end refresh.

Do polyurethane engine mounts increase cabin noise?

Yes, somewhat. Polyurethane mounts transmit more vibration and noise into the cabin compared to factory rubber mounts, but they significantly reduce drivetrain movement, which improves launch consistency and reduces driveline lash under hard acceleration.

What PCV valve do I need for my engine?

PCV valve selection depends on your specific engine family and port configuration. Confirm your engine code and check the product listing for exact port thread and flow specifications before ordering.

How often should engine bearings be replaced?

Bearings are typically replaced during any bottom end rebuild, when preparing an engine for significantly higher horsepower, or when a bearing failure is diagnosed. There is no fixed mileage interval since bearing wear depends on oil quality, maintenance history, and load.

Can I install engine block parts myself?

Bolt-on items like block off plates, PCV valves, and cap covers are DIY friendly for most enthusiasts. Bearings, sleeves, and full gasket kit installations require engine disassembly and should be performed by an experienced builder or machine shop.

Why Buy Engine Block Parts from Black Ops Auto Works

Black Ops Auto Works stocks 2,187 engine block SKUs across HEMI, Hellcat, Trackhawk, TRX, LS, LT, Coyote, and diesel platforms with real fitment data, competitive pricing, and support from staff who build these engines themselves. Products are filterable by year, make, model, trim, engine, and drivetrain to confirm the correct application before ordering.

For focused shopping, browse our engine, valves and components, cooling, oil, and fuel delivery collections to complete your build.