HP Series Cylinder Head Hex Bolts - Small Block Chevy

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head re-torquing. All High Performance Series bolts are 170,000 PSI (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

NUT Mercruiser 11-13436

CPO GC VER.XL5.44 Mercruiser 1600-8M0073436

Hi-Performance Head Bolt Kit

Small Block Chevy Head Bolts, Cast Iron OEM, LT-AFR, Brodix-8,-10,-11,-11xb Heads (Black Oxide Inner Rows, Stainless Steel Outer Row) Hex Head

HIGH PERFORMANCE SERIES
High Performance head bolts are available with a reduced wrenching hex and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head re-torquing. All High Performance Series bolts are 170,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Hi-Performance Head Bolt Kit, SBC Gen III/LS Series (2003 & Earlier) Hex Head

HIGH PERFORMANCE SERIES
High Performance head bolts are available with a reduced wrenching hex and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head re-torquing. All High Performance Series bolts are 170,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

Hi-Performance Head Bolt Kit, SBC Gen III/LS Series (2004 & Earlier) w/All Same Length Bolts

HIGH PERFORMANCE SERIES
High Performance head bolts are available with a reduced wrenching hex and wide area flanged head that eliminates the need for valve train removal to facilitate cylinder head re-torquing. All High Performance Series bolts are 170,000 psi (which is 15% stronger than Grade 8) and kits come complete with hardened parallel-ground washers.

White nylon and FDA approved.

Size: 5/8" x 5/8" x 5/8"

Additional Details:

• For: V4 & V6 60 degree 1988-2001

Interchanges/Replaces

GLM

• 40590

Johnson/Evinrude Outboard

• 436852
• 438996

Mallory

• 9-37102

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
NSS	Johnson/Evinrude Outboard 0340657	1	Gasket, Cover	No Image	N/A
18-7038	Johnson/Evinrude Outboard 379312 387262 396520	1	Needle & Seat		N/A
NSS	Johnson/Evinrude Outboard 0343512	1	Gasket, Nozzle	No Image	N/A
NSS	Johnson/Evinrude Outboard 0335070	1	Gasket, Float Bowl	No Image	N/A
NSS	Johnson/Evinrude Outboard 0335077	1	Pin, Float	No Image	N/A
NSS	Johnson/Evinrude Outboard 0343613	3	Seal, Carburetor	No Image	N/A
18-7101	GLM 80100 Johnson/Evinrude Outboard 305739 Mallory 9-76519 OMC Stern Drive 305739	1	O-Ring		N/A
NSS	Johnson/Evinrude Outboard 0341085	1	Gasket, Cover Plate	No Image	N/A

Key Features:

• Yamaha 6H2-W0078-A0-00 + 663-44311-02-00 = 18-3408
• Same as 18-3429 but includes Water Pump Housing

Interchanges/Replaces

Yamaha Outboard

• 663-44311-02
• 6H3-W0078-00-00
• 6H3-W0078-01-00
• 6H3-W0078-A0-00

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0256	Yamaha Outboard 91290-08045-00 97095-08045-00 97290-08045-00 97370-08045-00 97395-08045-00	2	Bolt		N/A
18-0292	Mercury Marine 27-81417 27-81417M Yamaha Outboard 663-44315-00-00 663-44315-A0-00	1	Wear Plate to Pump Housing Gasket		N/A
18-0294	Mercury Marine 27-81421M Yamaha Outboard 663-44324-00-00 663-44324-A0-00	1	Wear Plate to Pump Base Gasket		N/A
18-3068	GLM 89900 Mallory 9-45601 9-45601-10 Yamaha Outboard 6H2-44352-00-00 6H2-44352-01-00 6H2-44352-02-00	1	Impeller		N/A
18-3297	Mercury Marine 28-97089M Yamaha Outboard 90280-03M03-00 90280-03M07-00	1	Impeller Key		N/A
18-3435	Mercury Marine 81419M Yamaha Outboard 663-44322-00-00	1	Insert Cup		N/A
18-3436	Mercury Marine 81420M Yamaha Outboard 663-44323-00-00	1	Wear Plate		N/A
18-99149	Mercury Marine 27-81418M Yamaha Outboard 663-44316-00-00 663-44316-A0-00	1	Water Pump Gasket		N/A
18-0297	Mallory 9-76413 Mercury Marine 26-82234M Yamaha Outboard 93101-23070-00	1	Oil Seal		N/A
NSS	Yamaha Outboard 6J8-44311-00-00	1	Housing, Water Pump	No Image	N/A
NSS	Yamaha Outboard 97395-08055-00	2	Bolt	No Image	N/A

Interchanges/Replaces

Mercury Marine

• 84188M
• 84188T

Yamaha Outboard

• 663-W0078-00-00
• 663-W0078-A0-00

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0256	Yamaha Outboard 91290-08045-00 97095-08045-00 97290-08045-00 97370-08045-00 97395-08045-00	2	Bolt		N/A
18-0292	Mercury Marine 27-81417 27-81417M Yamaha Outboard 663-44315-00-00 663-44315-A0-00	1	Wear Plate to Pump Housing Gasket		N/A
18-0294	Mercury Marine 27-81421M Yamaha Outboard 663-44324-00-00 663-44324-A0-00	1	Wear Plate to Pump Base Gasket		N/A
18-3069	GLM 89910 Mallory 9-45602 9-45602-10 Mercury Marine 47-81423M 47-82824M 47-97108M Yamaha Outboard 697-44352-00-00 6H2-44352-00-00	1	Impeller		N/A
18-3435	Mercury Marine 81419M Yamaha Outboard 663-44322-00-00	1	Insert Cup		N/A
18-3436	Mercury Marine 81420M Yamaha Outboard 663-44323-00-00	1	Wear Plate		N/A
18-3297	Mercury Marine 28-97089M Yamaha Outboard 90280-03M03-00 90280-03M07-00	1	Impeller Key		N/A
18-1830	Mercury Marine 26-81426M Yamaha Outboard 663-44366-00-00	1	Water Seal Damper		N/A
NSS	Yamaha Outboard 97095-08055-00	2	Bolt	No Image	N/A

Key Features:

• Same as 18-3408 but without housing

Interchanges/Replaces

Yamaha Outboard

• 6H3-W0078-00-00
• 6H3-W0078-01-00
• 6H3-W0078-A0-00

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-0256	Yamaha Outboard 91290-08045-00 97095-08045-00 97290-08045-00 97370-08045-00 97395-08045-00	2	Bolt		N/A
18-0292	Mercury Marine 27-81417 27-81417M Yamaha Outboard 663-44315-00-00 663-44315-A0-00	1	Wear Plate to Pump Housing Gasket		N/A
18-0294	Mercury Marine 27-81421M Yamaha Outboard 663-44324-00-00 663-44324-A0-00	1	Wear Plate to Pump Base Gasket		N/A
18-3068	GLM 89900 Mallory 9-45601 9-45601-10 Yamaha Outboard 6H2-44352-00-00 6H2-44352-01-00 6H2-44352-02-00	1	Impeller		N/A
18-3435	Mercury Marine 81419M Yamaha Outboard 663-44322-00-00	1	Insert Cup		N/A
18-3436	Mercury Marine 81420M Yamaha Outboard 663-44323-00-00	1	Wear Plate		N/A
18-3297	Mercury Marine 28-97089M Yamaha Outboard 90280-03M03-00 90280-03M07-00	1	Impeller Key		N/A
18-99149	Mercury Marine 27-81418M Yamaha Outboard 663-44316-00-00 663-44316-A0-00	1	Water Pump Gasket		N/A
18-0297	Mallory 9-76413 Mercury Marine 26-82234M Yamaha Outboard 93101-23070-00	1	Oil Seal		N/A
NSS	Yamaha Outboard 97095-08055-00	2	Bolt	No Image	N/A