BLOX Racing BXPT-00500-81 LS/VTEC Conversion Kit 81mm Head Gasket Honda B18 B20

Vehicle Fitment

• Honda B18A1 engine block (1990-2001 Acura Integra LS/GS, Non-VTEC) mated to B16A, B18C1, B18C5 DOHC VTEC cylinder head
• Honda B18B1 engine block (1994-2001 Acura Integra LS/GS, Non-VTEC) mated to B16A, B18C1, B18C5 DOHC VTEC cylinder head
• Honda B20B / B20Z engine block (1997-2001 Honda CR-V, Non-VTEC) mated to B16A, B18C1, B18C5 DOHC VTEC cylinder head
• Compatible VTEC cylinder heads: B16A (all variants), B18C1 (GSR), B18C5 (Type R) - DOHC VTEC only

Fitment Notes

• This kit enables mating of Non-VTEC B18 and B20 engine blocks to DOHC VTEC cylinder heads (B16A-B18C1-5) - no block or head machining required for alignment
• This listing includes the 81mm head gasket - intended for B18 and stock-bore B20 applications; verify your exact bore size before ordering (84mm version available separately as BXPT-00500-84)
• Does not fit SOHC D-Series, H-Series, F-Series, or K-Series engines - B-Series LS/VTEC builds only
• Does not fit B16A, B18C, or B18C5 blocks (already VTEC) - this kit is for Non-VTEC B18/B20 blocks only
• A separate VTEC-compatible ECU, wiring harness, and distributor are required to complete the LS/VTEC conversion - not included in this kit
• BLOX Racing VTEC camshafts and valvetrain components are recommended to maximize power potential of the completed LS/VTEC build

Features

• Engineered specifically for the Honda LS/VTEC conversion - allows B18 and B20 Non-VTEC engine blocks to be mated to B16A-B18C1-5 DOHC VTEC cylinder heads without any block or head machining
• Oil filter block adapter (sandwich plate) provides the necessary oil feed routing from the block's oil filter housing to the VTEC cylinder head, ensuring proper VTEC solenoid and rocker arm lubrication
• Precision alignment dowel pins ensure correct head-to-block positioning during assembly - critical for proper sealing and head bolt torque pattern
• Teflon-coated, stainless steel braided -6AN oil feed line delivers reliable, heat-resistant, and pressure-rated oil delivery between the block adapter and cylinder head
• 3/4" Boss to -6AN fitting and Head to -6AN fitting included for a secure, leak-free oil line connection at both the block and head end
• 1/8 NPT plugs included to cap unused oil ports as required during the conversion
• 81mm head gasket included - correctly sized for B18 and standard-bore B20 block applications
• All components selected to work together as a complete, ready-to-assemble system - no sourcing of individual fittings or adapters required

Specifications

• Part Number: BXPT-00500-81
• Application: Honda B18 / B20 Non-VTEC block to B16A-B18C1-5 DOHC VTEC head conversion
• Head Gasket Size: 81mm (included)
• Oil Feed Line: -6AN to -6AN, Teflon-coated stainless steel braided
• Block Fitting: 3/4" Boss to -6AN
• Head Fitting: Cylinder head port to -6AN
• Oil Adapter: Sandwich plate / oil filter block adapter
• Plugs: 1/8 NPT (for unused oil ports)
• Machining Required: None
• Engine Family: Honda B-Series (Non-VTEC B18/B20 block + DOHC VTEC head)

Included Components

• 1x Oil filter block adapter / sandwich plate
• 1x 3/4" Boss to -6AN fitting (block side)
• 1x Cylinder head to -6AN fitting (head side)
• 1x -6AN to -6AN Teflon-coated stainless steel braided oil feed line
• 1x Set of alignment dowel pins (B-Series head-to-block)
• 1x Set of 1/8 NPT plugs
• 1x 81mm head gasket

Product Description

The BLOX Racing BXPT-00500-81 LS/VTEC Conversion Kit is a purpose-built solution for one of the most established engine builds in Honda performance: the LS/VTEC. This conversion pairs the displacement and low-end torque of a Non-VTEC B18 or B20 engine block with the high-revving, high-output potential of a B16A, B18C1 (GSR), or B18C5 (Type R) DOHC VTEC cylinder head - creating a combination that delivers a broader power band than either engine could produce alone. BLOX Racing engineered this kit to eliminate the most common barriers to a clean LS/VTEC build: proper head-to-block alignment and correct VTEC oil feed routing. Precision alignment dowel pins ensure the VTEC head seats correctly on the Non-VTEC block without any machining to either component, preserving the integrity of both parts and simplifying the assembly process.

The oil feed system is the most critical element of any LS/VTEC conversion, and BLOX Racing addresses this with a complete oil delivery package. The included sandwich plate oil filter block adapter taps into the block's oil filter housing to route pressurized oil through a Teflon-coated, stainless steel braided -6AN feed line up to the VTEC cylinder head - ensuring the VTEC solenoid and rocker arm oil passages receive adequate lubrication at all RPM ranges. All fittings, including the 3/4" Boss to -6AN block fitting and the head-side -6AN fitting, are included along with 1/8 NPT plugs for sealing unused oil ports. This listing includes an 81mm head gasket, correctly sized for B18 and standard-bore B20 block applications. A VTEC-compatible ECU, wiring, and distributor are required to complete the conversion but are not included in this kit. For builders looking to maximize the output of their completed LS/VTEC, BLOX Racing's VTEC camshafts and valvetrain components are purpose-matched for use with this platform.