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Reduced price! Reinforced cylinder head gasket Honda Prelude H23A1

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Reinforced cylinder head gasket Honda Prelude H23A1

Reference:

Brand Gaskets Cylinder Head reinforced

Condition: New product

Reinforced Cometic MLS head gaskets for the Honda Prelude H23A1 engine.

Engine: H23A1
Bores: 87.5, 88 or 89 mm
Thicknesses: 0.69 to 3.56 mm
Replaces: 12251-P14-A02

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The Honda engines covered

Code H23A1: the Honda engine powers the Prelude from 1992 to 1996 according to the applications published by Cometic, whose part numbers on this page are listed for the H23A1.

The gasket fitted at the factory carries Honda number 12251-P14-A02. Honda has discontinued this part and gives no replacement number, nor the bore, thickness or construction of this gasket. It is sized for the standard combustion pressure: beyond it, the head loses clamping, lifts and coolant gets into a cylinder.

Reinforced cylinder head gaskets

The seal does not rest on the gasket alone: the fasteners that clamp the head to the block weigh as much as it does. Beyond 100 N/mm², a composite gasket settles with no recovery; the 301 stainless steel of MLS gaskets takes 517 N/mm², 5 times more, and regains its shape at every combustion. Follow the tightening torque and sequence given in the Honda manual for your engine.

This page gathers the part numbers of Cometic, an American maker of competition gaskets, in a single construction: the MLS, a multi-layer stainless steel gasket. Three bores are offered, 87.5, 88 and 89 mm, with thicknesses from 0.69 to 3.56 mm. 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-P14-A02 (pièce arrêtée chez Honda, aucune référence de remplacement indiquée)
87.5 mm	0.69 mm	4.15	MLS	Cometic	C4553-027
87.5 mm	0.76 mm	4.57	MLS	Cometic	C4553-030
87.5 mm	0.91 mm	5.47	MLS	Cometic	C4553-036
87.5 mm	1.02 mm	6.13	MLS	Cometic	C4553-040
87.5 mm	1.14 mm	6.86	MLS	Cometic	C4553-045
87.5 mm	1.30 mm	7.82	MLS	Cometic	C4553-051
87.5 mm	1.42 mm	8.54	MLS	Cometic	C4553-056
87.5 mm	1.52 mm	9.14	MLS	Cometic	C4553-060
87.5 mm	1.68 mm	10.10	MLS	Cometic	C4553-066
87.5 mm	1.78 mm	10.70	MLS	Cometic	C4553-070
87.5 mm	1.91 mm	11.49	MLS	Cometic	C4553-075
87.5 mm	2.03 mm	12.21	MLS	Cometic	C4553-080
87.5 mm	2.13 mm	12.81	MLS	Cometic	C4553-084
87.5 mm	2.18 mm	13.11	MLS	Cometic	C4553-086
87.5 mm	2.34 mm	14.07	MLS	Cometic	C4553-092
87.5 mm	2.49 mm	14.97	MLS	Cometic	C4553-098
87.5 mm	3.05 mm	18.34	MLS	Cometic	C4553-120
87.5 mm	3.56 mm	21.41	MLS	Cometic	C4553-140
88 mm	0.69 mm	4.20	MLS	Cometic	C4554-027
88 mm	0.76 mm	4.62	MLS	Cometic	C4554-030
88 mm	0.91 mm	5.53	MLS	Cometic	C4554-036
88 mm	1.02 mm	6.20	MLS	Cometic	C4554-040
88 mm	1.14 mm	6.93	MLS	Cometic	C4554-045
88 mm	1.30 mm	7.91	MLS	Cometic	C4554-051
88 mm	1.42 mm	8.64	MLS	Cometic	C4554-056
88 mm	1.52 mm	9.24	MLS	Cometic	C4554-060
88 mm	1.68 mm	10.22	MLS	Cometic	C4554-066
88 mm	1.78 mm	10.83	MLS	Cometic	C4554-070
88 mm	1.91 mm	11.62	MLS	Cometic	C4554-075
88 mm	2.03 mm	12.35	MLS	Cometic	C4554-080
88 mm	2.13 mm	12.95	MLS	Cometic	C4554-084
88 mm	2.18 mm	13.26	MLS	Cometic	C4554-086
88 mm	2.34 mm	14.23	MLS	Cometic	C4554-092
88 mm	2.49 mm	15.14	MLS	Cometic	C4554-098
88 mm	3.05 mm	18.55	MLS	Cometic	C4554-120
88 mm	3.56 mm	21.65	MLS	Cometic	C4554-140
89 mm	0.69 mm	4.29	MLS	Cometic	C4555-027
89 mm	0.76 mm	4.73	MLS	Cometic	C4555-030
89 mm	0.91 mm	5.66	MLS	Cometic	C4555-036
89 mm	1.02 mm	6.35	MLS	Cometic	C4555-040
89 mm	1.14 mm	7.09	MLS	Cometic	C4555-045
89 mm	1.30 mm	8.09	MLS	Cometic	C4555-051
89 mm	1.42 mm	8.83	MLS	Cometic	C4555-056
89 mm	1.52 mm	9.46	MLS	Cometic	C4555-060
89 mm	1.68 mm	10.45	MLS	Cometic	C4555-066
89 mm	1.78 mm	11.07	MLS	Cometic	C4555-070
89 mm	1.91 mm	11.88	MLS	Cometic	C4555-075
89 mm	2.03 mm	12.63	MLS	Cometic	C4555-080
89 mm	2.13 mm	13.25	MLS	Cometic	C4555-084
89 mm	2.18 mm	13.56	MLS	Cometic	C4555-086
89 mm	2.34 mm	14.56	MLS	Cometic	C4555-092
89 mm	2.49 mm	15.49	MLS	Cometic	C4555-098
89 mm	3.05 mm	18.97	MLS	Cometic	C4555-120
89 mm	3.56 mm	22.15	MLS	Cometic	C4555-140

A gasket's volume is the void it leaves above each cylinder. That void adds to the combustion chamber and reduces the compression ratio, all the more when the gasket is thick and the bore large. Compare these values only between gaskets of the same bore. On this page the volume therefore changes with the bore chosen among 87.5, 88 and 89 mm as much as with the thickness.

Preparation and fitting

Fasteners	Engines	Tightening torque
Original cylinder head bolts	H23A1	not published by the manufacturer

Before assembly, check the flatness of the head and block faces with a straightedge, and have any that need it machined. Use no sealing paste: Cometic gaskets are supplied coated. Also check the joint face along the whole length of the H23A1 head.

Technical guide

The construction offered

Cometic MLS
Five stainless steel sheets, embossed, stacked and riveted. The outer sheets draw active beads around the cylinders and the fluid passages. A measured tightening torque is enough to seal, without distorting the bore. This gasket suits the tuned naturally aspirated engine as well as moderate forced induction. On this page it is offered in 87.5, 88 and 89 mm.

Choosing bore and thickness

Gasket bore. Cometic MLS comes in 87.5 mm (C4553), in 88 mm (C4554) and in 89 mm (C4555).

Thickness. Honda gives no thickness for the original gasket of the H23A1. 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 provided: measure the removed gasket and keep the closest value offered
Skimmed cylinder head, make up the lost height	The offered value closest to the figure read on the removed gasket, plus the material taken off when resurfacing
Forced induction build, lower the ratio	A thickness above the one read on the removed gasket
Naturally aspirated build, raise the ratio	A thickness below that of the removed gasket, down to 0.69 mm, the thinnest in the range

For a thickness below the original, first read with a dial gauge how far the pistons stand proud of the block deck: this measurement gives the clearance remaining between piston and head. This check applies to each of the three bores on this page, 87.5, 88 and 89 mm.

The brand

Cometic Gasket, Inc. is an American company created in 1989 in Concord, Ohio, that designs engine gaskets and sealing solutions. It made its name with the made-to-measure gasket, cut to the bore and thickness requested. All production stays in the United States, with American materials. For the H23A1 it offers three bores here, 87.5, 88 and 89 mm.

Advantages over the original gasket

Criterion	Original gasket 12251-P14-A02	Reinforced gaskets
Construction	Construction not stated by the manufacturer	Multi-layer stainless steel (MLS)
Gasket bore	not published by the manufacturer	87,5 / 88 / 89 mm
Thicknesses available	thickness not published by the manufacturer	0.69 to 3.56 mm, 18 values
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 87.5, 88 or 89 mm bore of the gaskets offered 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	H23A1	not published	1992-1996

OEM part number: 12251-P14-A02, discontinued by Honda.

Important: the part numbers on this page correspond to the Honda H23A1 engine, listed by Cometic for the Prelude from 1992 to 1996: read off your car's engine code and measure your cylinder bore before ordering, 87.5, 88 or 89 mm.

Why switch to a reinforced gasket?

When the original gasket reaches its limits, the reinforced gasket replaces it: under higher combustion pressure, it keeps its geometry and does not sag. This page offers it for the Honda H23A1 engine.

With a turbo, a supercharger or a higher compression ratio, the head works harder and the gasket becomes the weak point of the top end. A reinforced gasket prevents the gas or coolant leak and the head removal that follows, with the car off the road. The Prelude's H23A1 is no exception to this rule.

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