2.0 16v - B20A5

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2.0 16v - B20A5

Reduced price! Reinforced head gasket Honda Prelude 2.0 B20A3 B20A5

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Reinforced head gasket Honda Prelude 2.0 B20A3 B20A5

Reference:

Brand Gaskets Cylinder Head reinforced

Condition: New product

Reinforced Cometic head gasket, in multi-layer MLS. Sold individually, one gasket per engine.

Engines: Honda 2.0 L B20A3 and B20A5
Bore: 81.5, 82, 83 or 84 mm (MLS)
Thickness: 0.69 to 3.56 mm, 18 values per bore
Replaces: 12251-PK1-662

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The Honda engines covered

The B20A3 and B20A5 are 2.0 litre petrol engines. They power the Honda Prelude III (BA) models listed in the compatibility table below.

The original gasket carries part number 12251-PK1-662. Honda publishes neither its bore, nor its thickness, nor its construction. Each engine takes one cylinder head gasket, sized for the standard combustion pressure; when that pressure climbs, the clamping force eases, the head lifts slightly and coolant seeps into a cylinder.

Reinforced cylinder head gaskets

Sealing does not rest on the gasket alone but also on the fasteners that press the head onto the block. Beyond 100 N/mm², a composite gasket compresses for good; the 301 stainless steel of MLS gaskets takes 517 N/mm², 5 times more, and recovers its shape at every combustion. Also check the condition of the head bolts and replace any that are stretched or damaged. Do this for the head bolts of your B20A.

This page brings together 72 Cometic part numbers, from the American maker of competition gaskets, for a single construction: MLS, multi-layer steel. Four bores are offered: 81.5 mm (C4564), 82 mm (C4565), 83 mm (C4566) and 84 mm (C4567), each in 18 thicknesses from 0.69 to 3.56 mm. An engine takes a single gasket: order one part number. The thicknesses offered let you adjust the compression ratio without touching the pistons or the cylinder head. As a rule, the gasket bore chosen is at least 0.5 mm larger than the actual cylinder bore. Each part number is sold individually, one gasket per engine.

Technical specifications

Gasket bore	Thickness	Gasket volume	Gasket type OEM not specified	Brand	Part number OEM 12251-PK1-662
81.5 mm	0.69 mm	3.60	MLS	Cometic	C4564-027
81.5 mm	0.76 mm	3.96	MLS	Cometic	C4564-030
81.5 mm	0.91 mm	4.75	MLS	Cometic	C4564-036
81.5 mm	1.02 mm	5.32	MLS	Cometic	C4564-040
81.5 mm	1.14 mm	5.95	MLS	Cometic	C4564-045
81.5 mm	1.30 mm	6.78	MLS	Cometic	C4564-051
81.5 mm	1.42 mm	7.41	MLS	Cometic	C4564-056
81.5 mm	1.52 mm	7.93	MLS	Cometic	C4564-060
81.5 mm	1.68 mm	8.76	MLS	Cometic	C4564-066
81.5 mm	1.78 mm	9.29	MLS	Cometic	C4564-070
81.5 mm	1.91 mm	9.96	MLS	Cometic	C4564-075
81.5 mm	2.03 mm	10.59	MLS	Cometic	C4564-080
81.5 mm	2.13 mm	11.11	MLS	Cometic	C4564-084
81.5 mm	2.18 mm	11.37	MLS	Cometic	C4564-086
81.5 mm	2.34 mm	12.21	MLS	Cometic	C4564-092
81.5 mm	2.49 mm	12.99	MLS	Cometic	C4564-098
81.5 mm	3.05 mm	15.91	MLS	Cometic	C4564-120
81.5 mm	3.56 mm	18.57	MLS	Cometic	C4564-140
82 mm	0.69 mm	3.64	MLS	Cometic	C4565-027
82 mm	0.76 mm	4.01	MLS	Cometic	C4565-030
82 mm	0.91 mm	4.81	MLS	Cometic	C4565-036
82 mm	1.02 mm	5.39	MLS	Cometic	C4565-040
82 mm	1.14 mm	6.02	MLS	Cometic	C4565-045
82 mm	1.30 mm	6.87	MLS	Cometic	C4565-051
82 mm	1.42 mm	7.50	MLS	Cometic	C4565-056
82 mm	1.52 mm	8.03	MLS	Cometic	C4565-060
82 mm	1.68 mm	8.87	MLS	Cometic	C4565-066
82 mm	1.78 mm	9.40	MLS	Cometic	C4565-070
82 mm	1.91 mm	10.09	MLS	Cometic	C4565-075
82 mm	2.03 mm	10.72	MLS	Cometic	C4565-080
82 mm	2.13 mm	11.25	MLS	Cometic	C4565-084
82 mm	2.18 mm	11.51	MLS	Cometic	C4565-086
82 mm	2.34 mm	12.36	MLS	Cometic	C4565-092
82 mm	2.49 mm	13.15	MLS	Cometic	C4565-098
82 mm	3.05 mm	16.11	MLS	Cometic	C4565-120
82 mm	3.56 mm	18.80	MLS	Cometic	C4565-140
83 mm	0.69 mm	3.73	MLS	Cometic	C4566-027
83 mm	0.76 mm	4.11	MLS	Cometic	C4566-030
83 mm	0.91 mm	4.92	MLS	Cometic	C4566-036
83 mm	1.02 mm	5.52	MLS	Cometic	C4566-040
83 mm	1.14 mm	6.17	MLS	Cometic	C4566-045
83 mm	1.30 mm	7.03	MLS	Cometic	C4566-051
83 mm	1.42 mm	7.68	MLS	Cometic	C4566-056
83 mm	1.52 mm	8.22	MLS	Cometic	C4566-060
83 mm	1.68 mm	9.09	MLS	Cometic	C4566-066
83 mm	1.78 mm	9.63	MLS	Cometic	C4566-070
83 mm	1.91 mm	10.33	MLS	Cometic	C4566-075
83 mm	2.03 mm	10.98	MLS	Cometic	C4566-080
83 mm	2.13 mm	11.52	MLS	Cometic	C4566-084
83 mm	2.18 mm	11.80	MLS	Cometic	C4566-086
83 mm	2.34 mm	12.66	MLS	Cometic	C4566-092
83 mm	2.49 mm	13.47	MLS	Cometic	C4566-098
83 mm	3.05 mm	16.50	MLS	Cometic	C4566-120
83 mm	3.56 mm	19.26	MLS	Cometic	C4566-140
84 mm	0.69 mm	3.82	MLS	Cometic	C4567-027
84 mm	0.76 mm	4.21	MLS	Cometic	C4567-030
84 mm	0.91 mm	5.04	MLS	Cometic	C4567-036
84 mm	1.02 mm	5.65	MLS	Cometic	C4567-040
84 mm	1.14 mm	6.32	MLS	Cometic	C4567-045
84 mm	1.30 mm	7.20	MLS	Cometic	C4567-051
84 mm	1.42 mm	7.87	MLS	Cometic	C4567-056
84 mm	1.52 mm	8.42	MLS	Cometic	C4567-060
84 mm	1.68 mm	9.31	MLS	Cometic	C4567-066
84 mm	1.78 mm	9.86	MLS	Cometic	C4567-070
84 mm	1.91 mm	10.58	MLS	Cometic	C4567-075
84 mm	2.03 mm	11.25	MLS	Cometic	C4567-080
84 mm	2.13 mm	11.80	MLS	Cometic	C4567-084
84 mm	2.18 mm	12.08	MLS	Cometic	C4567-086
84 mm	2.34 mm	12.97	MLS	Cometic	C4567-092
84 mm	2.49 mm	13.80	MLS	Cometic	C4567-098
84 mm	3.05 mm	16.90	MLS	Cometic	C4567-120
84 mm	3.56 mm	19.73	MLS	Cometic	C4567-140

A gasket's volume is the free space it leaves above each cylinder; it adds to the combustion chamber and lowers the compression ratio. Compare only gaskets of the same bore: 81.5, 82, 83 or 84 mm here.

Preparation and fitting

Fasteners	Engines	Tightening torque
Original cylinder head bolts	B20A3, B20A5	not published by the manufacturer

Before reassembly, check the flatness of the head and block mating faces with a straightedge and have them resurfaced if needed. Cometic gaskets arrive already coated: do not apply any sealing paste. Also clean the gasket faces thoroughly before fitting. Do this on the head and on the block of your B20A.

Technical guide

The construction offered

Cometic MLS
Several stainless steel sheets, stamped and riveted together. Each outer sheet carries active beads tracing the outline of every cylinder and fluid passage. A moderate clamping load is enough to seal, and the bore distorts very little. This versatile gasket suits anything from a tuned naturally aspirated engine to light boost. All the part numbers on this page are offered in this construction. Here it serves the B20A3 and B20A5.

Choosing bore and thickness

Gasket bore. The Cometic MLS is offered in 81.5 mm (C4564), 82 mm (C4565), 83 mm (C4566) and 84 mm (C4567).

Thickness. No thickness is published for the original gasket 12251-PK1-662. A thicker gasket enlarges the combustion chamber and lowers the compression ratio; a thinner one reduces it and raises the ratio.

Your goal	Thickness to choose
Keep the original compression ratio	Original thickness not published: measure the gasket you removed, then choose the offered value that matches it best on your B20A
Skimmed cylinder head, make up the lost height	The offered value nearest the removed gasket's thickness, plus the material taken off when the head or block was resurfaced, on your B20A
Forced induction build, lower the ratio	A thickness greater than that of the removed gasket
Naturally aspirated build, raise the ratio	A thickness smaller than that of the removed gasket, down to 0.69 mm, the thinnest value offered on your B20A

To choose a thickness below the original, first use a dial gauge to read how far the pistons stand above the block face: that figure gives the clearance left between piston and head. On this engine, take that measurement at each piston.

The brand

Cometic Gasket, Inc. is an American company founded in 1989 and based in Concord, Ohio, which designs and builds gaskets and sealing parts for engines. It earned its name with made-to-measure gaskets, cut to the bore and thickness required, all made in the United States from American materials. Its part numbers for these engines are offered here in four bores.

Advantages over the original gasket

Criterion	Original gasket 12251-PK1-662	Reinforced gaskets
Construction	Construction not stated by the manufacturer	Multilayer stainless steel (MLS) The 72 part numbers on this page, made for the B20A3 and B20A5, are all built this way.
Gasket bore	not published	81.5, 82, 83 and 84 mm
Thicknesses available	thickness not provided by the manufacturer	0.69 to 3.56 mm, 18 values for each bore
Compression ratio adjustment	None	Through the thickness chosen
Resistance to overpressure	Limited to standard output	Designed for forced induction

When a reinforced gasket becomes necessary

Adding forced induction, or raising boost on an already turbocharged engine
Cylinder rebored beyond what the 81.5 to 84 mm bores of these gaskets covers
Looking for a compression ratio different from standard, higher or lower
Engine that has already lost its gasket, or is consuming coolant
Competition use, where the gasket goes through repeated temperature rises

Vehicle compatibility

Model	Engine code	Power	Years
HONDA PRELUDE III (BA) 2.0 (BA4)	B20A3	106 hp	09.1987 - 12.1991
HONDA PRELUDE III (BA) 2.0 EX (BA4)	B20A3	109 hp	04.1987 - 01.1992
HONDA PRELUDE III (BA) 2.0 i EX 16V Cat (BA4)	B20A5	137 hp	04.1987 - 01.1992

OEM part number: 12251-PK1-662.

Important: the part numbers on this page suit only the B20A3 and B20A5 engines: check your Honda's engine code before ordering.

Why switch to a reinforced gasket?

When the original gasket is no longer enough, the reinforced gasket replaces it: under higher combustion pressure it keeps its shape instead of collapsing. For the B20A3 and B20A5 on this page, it is the answer as soon as the engine goes beyond its original output.

Whether you add a turbo, raise the compression ratio or rev higher with livelier cams, the cylinder head gasket becomes the weak link of a high-output engine. A reinforced gasket prevents the leak and the head removal that goes with it, far costlier than the gasket. On these engines, the reinforced gasket is the first item to address once you go beyond the original output.

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