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for Shovelhead

for Shovelhead

S&S Super Stock Shovelhead Cylinder Heads
S&S Super Stock Shovelhead Cylinder Heads
Primarily designed for stock replacement applications where traditional looks and improved performance are important. These cylinder heads are made from the same high-quality aircraft-cylinder head material like the Evolution heads. The intake port is the same diameter and is positioned in the same location as stock which means stock manifolds bolt right up. A directional vane like the one used in S&S Evo heads to route the air around the valve stem and guide area is located in the floor of the port. Standard intake valve diameter is stock at 1 15/16“. The combustion chamber is identical to stock enabling installation on any engine with hemispherical domed pistons. The exhaust port is also stock configuration and readily accepts stock style exhaust systems. Standard exhaust valve diameter is also stock at 1 3/4“. The pre-installed .590“ lift valve springs are used for greater cam lift versatility, the valve seats are compatible with present day unleaded fuel. Although these heads for Shovel big Twins are designed for stock replacement applications, flow characteristics have been improved up to 9% more flow. S&S Shovelhead cylinder heads easily bolt on and fit like stock. Frame and other clearancing problems are non-existent. Exhaust systems with stock dimensions can be used. Stock rocker cover assemblies are not included and are installed using hardware provided. They are available as stock replacement and as a 2-plug version for 3 5/8” Big Bore cylinders. Each High Output Super Stock Shovelhead cylinder head kit includes front and rear cylinder heads completely assembled with valve seats, valve guides, valves, valve springs, spring collars, valve keepers and valve guide seals ready to run. Also included are gaskets required for installation including cylinder base and head gaskets, rocker cover and exhaust port gaskets, rocker cover and exhaust pipe mounting hardware and installation instructions.
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S&S Retro Panhead Conversion Kit
S&S Retro Panhead Conversion Kit
Here’s a way to give your Shovelhead engine the nostalgic look of a Panhead and improve performance at the same time.
The Retro Conversion kit consists of a set of S&S P-Series cylinder heads with rocker cradles, S&S roller rocker arms, S&S hydraulic tappets, billet tappet guides, Quickee pushrods, pushrod cover clips and the required gaskets and hardware for assembly. Pan covers are not included to allow option of using any style desired. The S&S P-Series heads included with the S&S Retro Conversion kit are the same heads that come on the new S&S P-Series engines. These heads have a Shovel head bolt pattern that makes these heads compatible with any stock or aftermarket cylinder for 1966-’84 big twins. They are designed to accept stock or S&S o-ring style manifolds for Shovelhead and accept any exhaust system made to fit a shovel engine. Heads come complete with valves and .590” lift valve springs. The billet tappet guides, tappets and Quickee pushrods are set up to oil the top end through the pushrods, just like on Evo models. The Retro Conversion kit requires that a 1984-‘99 style cam be used to ensure correct valve timing. 1970-’77 stock engines will also require a 1978-87 style pinion gear to mate with the late style cam gear. 1966-’69 engines or other engines with generator style crankcases will require a special generator style cam with 1984-’99 style lobes (see section “Cams”). Three versons of conversion kits are available: with heads for stock bore cylinders, with heads for 3-5/8” big bore cylinders or with dual plug heads for 3-5/8” big bore cylinders.
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