1.7 16v - D17

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1.7 16v - D17

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Reinforced head gasket Honda 1.7 16V D17A1 D17A2 D17A6

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 1.7 L 16V D17A1, D17A2, D17A6
Bore: 76, 77, 78 or 79 mm (MLS)
Thickness: 0.69 to 3.56 mm, 18 values per bore
Replaces: 12251-PLC-003

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The Honda engines covered

The D17A1, D17A2 and D17A6 are 1.7 litre sixteen-valve petrol engines. They power the Honda Civic VI (EK9) and Civic VII models and the Acura EL listed in the compatibility table below.

The original gasket carries part number 12251-PLC-003. Honda publishes neither its bore, nor its thickness, nor its construction. An engine takes a single cylinder head gasket. It is sized for standard combustion pressure; when that rises, the clamping load eases, the head lifts slightly and coolant enters 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.

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, 76 mm (C4474), 77 mm (C4473), 78 mm (C4472) and 79 mm (C4471), each in 18 thicknesses from 0.69 to 3.56 mm. The engine takes only one gasket: order a single 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-PLC-003
76 mm	0.69 mm	3.13	MLS	Cometic	C4474-027
76 mm	0.76 mm	3.45	MLS	Cometic	C4474-030
76 mm	0.91 mm	4.13	MLS	Cometic	C4474-036
76 mm	1.02 mm	4.63	MLS	Cometic	C4474-040
76 mm	1.14 mm	5.17	MLS	Cometic	C4474-045
76 mm	1.30 mm	5.90	MLS	Cometic	C4474-051
76 mm	1.42 mm	6.44	MLS	Cometic	C4474-056
76 mm	1.52 mm	6.90	MLS	Cometic	C4474-060
76 mm	1.68 mm	7.62	MLS	Cometic	C4474-066
76 mm	1.78 mm	8.07	MLS	Cometic	C4474-070
76 mm	1.91 mm	8.66	MLS	Cometic	C4474-075
76 mm	2.03 mm	9.21	MLS	Cometic	C4474-080
76 mm	2.13 mm	9.66	MLS	Cometic	C4474-084
76 mm	2.18 mm	9.89	MLS	Cometic	C4474-086
76 mm	2.34 mm	10.62	MLS	Cometic	C4474-092
76 mm	2.49 mm	11.30	MLS	Cometic	C4474-098
76 mm	3.05 mm	13.84	MLS	Cometic	C4474-120
76 mm	3.56 mm	16.15	MLS	Cometic	C4474-140
77 mm	0.69 mm	3.21	MLS	Cometic	C4473-027
77 mm	0.76 mm	3.54	MLS	Cometic	C4473-030
77 mm	0.91 mm	4.24	MLS	Cometic	C4473-036
77 mm	1.02 mm	4.75	MLS	Cometic	C4473-040
77 mm	1.14 mm	5.31	MLS	Cometic	C4473-045
77 mm	1.30 mm	6.05	MLS	Cometic	C4473-051
77 mm	1.42 mm	6.61	MLS	Cometic	C4473-056
77 mm	1.52 mm	7.08	MLS	Cometic	C4473-060
77 mm	1.68 mm	7.82	MLS	Cometic	C4473-066
77 mm	1.78 mm	8.29	MLS	Cometic	C4473-070
77 mm	1.91 mm	8.89	MLS	Cometic	C4473-075
77 mm	2.03 mm	9.45	MLS	Cometic	C4473-080
77 mm	2.13 mm	9.92	MLS	Cometic	C4473-084
77 mm	2.18 mm	10.15	MLS	Cometic	C4473-086
77 mm	2.34 mm	10.90	MLS	Cometic	C4473-092
77 mm	2.49 mm	11.59	MLS	Cometic	C4473-098
77 mm	3.05 mm	14.20	MLS	Cometic	C4473-120
77 mm	3.56 mm	16.58	MLS	Cometic	C4473-140
78 mm	0.69 mm	3.30	MLS	Cometic	C4472-027
78 mm	0.76 mm	3.63	MLS	Cometic	C4472-030
78 mm	0.91 mm	4.35	MLS	Cometic	C4472-036
78 mm	1.02 mm	4.87	MLS	Cometic	C4472-040
78 mm	1.14 mm	5.45	MLS	Cometic	C4472-045
78 mm	1.30 mm	6.21	MLS	Cometic	C4472-051
78 mm	1.42 mm	6.79	MLS	Cometic	C4472-056
78 mm	1.52 mm	7.26	MLS	Cometic	C4472-060
78 mm	1.68 mm	8.03	MLS	Cometic	C4472-066
78 mm	1.78 mm	8.51	MLS	Cometic	C4472-070
78 mm	1.91 mm	9.13	MLS	Cometic	C4472-075
78 mm	2.03 mm	9.70	MLS	Cometic	C4472-080
78 mm	2.13 mm	10.18	MLS	Cometic	C4472-084
78 mm	2.18 mm	10.42	MLS	Cometic	C4472-086
78 mm	2.34 mm	11.18	MLS	Cometic	C4472-092
78 mm	2.49 mm	11.90	MLS	Cometic	C4472-098
78 mm	3.05 mm	14.57	MLS	Cometic	C4472-120
78 mm	3.56 mm	17.01	MLS	Cometic	C4472-140
79 mm	0.69 mm	3.38	MLS	Cometic	C4471-027
79 mm	0.76 mm	3.73	MLS	Cometic	C4471-030
79 mm	0.91 mm	4.46	MLS	Cometic	C4471-036
79 mm	1.02 mm	5.00	MLS	Cometic	C4471-040
79 mm	1.14 mm	5.59	MLS	Cometic	C4471-045
79 mm	1.30 mm	6.37	MLS	Cometic	C4471-051
79 mm	1.42 mm	6.96	MLS	Cometic	C4471-056
79 mm	1.52 mm	7.45	MLS	Cometic	C4471-060
79 mm	1.68 mm	8.23	MLS	Cometic	C4471-066
79 mm	1.78 mm	8.72	MLS	Cometic	C4471-070
79 mm	1.91 mm	9.36	MLS	Cometic	C4471-075
79 mm	2.03 mm	9.95	MLS	Cometic	C4471-080
79 mm	2.13 mm	10.44	MLS	Cometic	C4471-084
79 mm	2.18 mm	10.69	MLS	Cometic	C4471-086
79 mm	2.34 mm	11.47	MLS	Cometic	C4471-092
79 mm	2.49 mm	12.21	MLS	Cometic	C4471-098
79 mm	3.05 mm	14.95	MLS	Cometic	C4471-120
79 mm	3.56 mm	17.45	MLS	Cometic	C4471-140

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 with the same bore, here 76, 77, 78 or 79 mm.

Preparation and fitting

Fasteners	Engines	Tightening torque
Original cylinder head bolts	D17A1, D17A2, D17A6	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.

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.

Choosing bore and thickness

Gasket bore. The Cometic MLS is offered in 76 mm (C4474), 77 mm (C4473), 78 mm (C4472) and 79 mm (C4471).

Thickness. No thickness is published for the original gasket 12251-PLC-003. 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 unknown: measure the removed gasket, then pick the offered value that comes closest
Skimmed cylinder head, make up the lost height	The offered value closest to the removed gasket's thickness, plus the metal taken off when resurfacing
Forced induction build, lower the ratio	A thickness above that of the removed gasket
Naturally aspirated build, raise the ratio	A thickness below that of the removed gasket, down to 0.69 mm, the lowest offered

Before choosing a thickness below the original, use a dial gauge to measure how far the pistons stand proud of the block face: it determines the clearance left between piston and head.

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.

Advantages over the original gasket

Criterion	Original gasket 12251-PLC-003	Reinforced gaskets
Construction	Construction not stated by the manufacturer	Multilayer stainless steel (MLS)
Gasket bore	not published	76, 77, 78 and 79 mm
Thicknesses available	thickness not provided by the manufacturer	0.69 to 3.56 mm, 18 values per 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 76 to 79 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 Civic VII Berline tricorps (ES, ET) 1.7	D17A1	117 hp	2000-2005
Honda Civic VII Coupé (EM2) 1.7	D17A1	117 hp	2001-2005
Honda Civic VII Hatchback (EU, EP, EV) 1.7 (EU3)	D17A1, D17A2	131 hp	2000-2005
Honda Civic VII Hatchback 1.7 AWD (EU4)	D17A1	131 hp	2000-2005
Acura EL Berline tricorps 1.7	D17A2	117 hp	2000-2003
Acura EL 1.7	D17A2	129 hp	2003-2005
Honda Civic VII Berline tricorps (ES, ET) 1.7 (ES1, ES3)	D17A2	131 hp	2000-2005
Honda Civic VII 1.7 EX (ES1)	D17A2	130 hp	2001-2006
Honda Civic VII 1.7 X4 4WD (ET2)	D17A2	130 hp	2004-2006
Honda Civic VI Berline tricorps (EJ, EK, SO) 1.7 (EK9)	D17A6	125 hp	1997-2001
Honda Civic VII Berline tricorps (ES, ET) 1.7	D17A6	116 hp	2001-2005
Honda Civic VII Coupé (EM2) 1.7	D17A6	118 hp	2001-2005
Honda Civic VII Hatchback (EU, EP, EV) 1.7 (ES1)	D17A6	125 hp	2000-2005

OEM part number: 12251-PLC-003.

Important: the part numbers on this page suit only the D17A1, D17A2 and D17A6 engines: check your vehicle'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.

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.

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