GM Service Manual Online
For 1990-2009 cars only

Object Number: 1775465  Size: MF
(1)Grade A
(2)Grade B
(3)Grade C
(4)Block Over-Bored
(5)Block Over-Bored and Deck Milled

Cylinder Head Gasket Grade

Ti Max (Piston Projection)

Compressed Gasket Thickness

Metric (mm)

English (in)

Metric (mm)

English (in)

Grade A

0.223 -0.274

0.0088 -0.0108

0.90-1.00

0.0354-0.0394

Grade B

0.274-0.325

0.0108-0.0128

0.95-1.05

0.0374-0.0413

Grade C

0.325-0.376

0.0128-0.0148

1.00-1.10

0.0394-0.0433

Block Over-Bored 0.010-0.030 in (0.254-0.762 mm)

0.223-0.376

0.0088-0.0148

1.00-1.10

0.0394-0.0433

Block Over-Bored 0.010-0.030 in (0.254-0.762 mm) and Deck Milled 0.008 in (0.203 mm)

0.4257-0.5777

0.0168-0.0228

1.25-1.35

0.0492-0.0532