Heads and Related

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons
• 79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .640" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs
• 79cc heads accept OEM rocker boxes
• 89cc heads accept S&S rocker boxes only (PART #90-4110)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons
• 79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .640" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs
• 79cc heads accept OEM rocker boxes
• 89cc heads accept S&S rocker boxes only (PART #90-4110)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons
• 79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .640" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs
• 79cc heads accept OEM rocker boxes
• 89cc heads accept S&S rocker boxes only (PART #90-4110)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons
• 79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .640" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs
• 79cc heads accept OEM rocker boxes
• 89cc heads accept S&S rocker boxes only (PART #90-4110)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.

• Now S&S heads are available to be used with stock-style flat-top pistons
• Kits are fully assembled, and include stainless steel valves and high-lift (.585") springs
• Intake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles)
• Optimized for smaller displacement engines
• Slight increase in compression (8.8:1 in an 80" motor) with 82cc chamber volume
• Port design increases flow, while maintaining velocity
• Set up for .585" maximum lift
• EFI compatible
• Available in silver powder-coat or black powder-coat finish
• Sold in pairs
• Made in the U.S.A.

• S&S heads give great performance, and work with additional upgrades
• Kits are fully assembled, and include stainless steel valves and high-lift springs (up to .640 lift)
• Available in natural and black powder-coat finish
• Intake manifold, pistons and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles)
• Must reuse stock headbolts
• S&S Super Stock piston kits are required and include 10:1 ratio pistons, rings, piston pins and clips (sold separately in pairs)
• Sold in pairs
• Made in the U.S.A.

• Stock replacement cylinders, 3.5" bore with cast-iron liner
• Available with natural or black powder-coat finish to match OEM components
• Sold in pairs
• Made in the U.S.A.

• S&S heads give great performance, and work with additional upgrades
• Kits are fully assembled, and include stainless steel valves and high-lift springs (up to .640 lift)
• Available in natural and black powder-coat finish
• Intake manifold, pistons and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles)
• Must reuse stock headbolts
• S&S Super Stock piston kits are required and include 10:1 ratio pistons, rings, piston pins and clips (sold separately in pairs)
• Sold in pairs
• Made in the U.S.A.

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons
• 79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .640" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs
• 79cc heads accept OEM rocker boxes
• 89cc heads accept S&S rocker boxes only (PART #90-4110)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons
• 79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .640" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs
• 79cc heads accept OEM rocker boxes
• 89cc heads accept S&S rocker boxes only (PART #90-4110)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.

• High port flow gives great performance now, and more later when additional upgrades are done
• Heads are fully assembled with springs and valves, and are available in silver or wrinkle black powder-coat
• Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications
• 79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons
• 79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .640" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs
• 79cc heads accept OEM rocker boxes
• 89cc heads accept S&S rocker boxes only (PART #90-4110)
• Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releases
• Do not include rocker arm components, intake manifold or gaskets
• Heads include four long headbolts, and reuse four long OEM headbolts
• Accept OEM intake manifolds
• Sold in pairs
• Made in the U.S.A.

• Now S&S heads are available to be used with stock-style flat-top pistons
• Kits are fully assembled, and include stainless steel valves and high-lift (.585") springs
• Intake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles)
• Optimized for smaller displacement engines
• Slight increase in compression (8.8:1 in an 80" motor) with 82cc chamber volume
• Port design increases flow, while maintaining velocity
• Set up for .585" maximum lift
• EFI compatible
• Available in silver powder-coat or black powder-coat finish
• Sold in pairs
• Made in the U.S.A.

Cylinder stud insert only comes as 8 pieces.

Replica Shovelhead cylinder head set is fully assembled with unleaded valve seats, cast iron valve guides, nitrated valves, valve guide seals and stock type valve spring kit.
Heads feature o-ring type manifold. Sold as a pair. Order stud set separat