Cylinder Head U20
Datsun Roadster U20 Chrome moly Retainers / Accepts L-series Lash Pads (Set of 8) AFTERMARKET USA
67 1/2 - 70 U20 Chrome moly steel w/heat treating valve retainer for 11/32 stem valves - set of 8. Chrome moly retainers w/heat treating are safer when using higher spring rates for race applications as the heat treating is through the entire part. It is especially important in the area where the valve collets reside where greater strength is not only desired but required. This is just one of the reasons these Chrome moly retainers have been highly sought after over the years. Now back in stock! Works great with any Cam requiring alternate retainers to get the geometry correct.
Schneider's design allowed for an improved fit on higher spring rate aftermarket valve springs with larger outer and inner spring I.D.'s than the original Nissan valve spring set.
For our own aftermarket valve spring set PART# 1665 & Isky's valve spring set #7005. Order our retainer set PART#1449AMISKY $140.00
For stock Nissan springs Order by PART# 1449STK $120.00. Now you won't have to worry about a sloppy fit to any valve spring sets. It's that simple!
The 2 retainer sets offered allow the use of a variety of different thickness L-series lash pads on a U20 motor to enable the user to dial in after-market camshafts. The Schneider Cams, high hat, integral one piece design offers excellent side support for tall lash pads, (SEE PHOTO) was preferred and highly sought after for street use and in the racing community. Tried & true. Hundreds & hundreds of the 11/32 U20 versions of these beauties were sold with no issues, thousands of the L-series 8mm valve version were sold in the open market as well. Retainer accepts L-series lash pad thicknesses up to .300. Nissan & Our aftermarket style retainer sets installed height are 1.620 as per correct & proper original Nissan U20 specification. All spring forces and heights are the same as the original Nissan retainer.
Formula to determine approximate lash pad thickness required: Original lash pad thickness for the stock U20 cams = .078. Re-ground cams have a reduced base circle. Some camshafts have a base circle that is very reduced. The important thing to remember from this is to check each re-ground camshaft to get the proper lash pad thickness required. We can help you choose the correct lash pad to get you in the ball park. Other factors that will effect what size lash pad to use are related to the actual rocker arms being used. Not all rocker arms are made exactly the same and can vary from rocker arm to rocker arm. Depth of the valve seats, installed height of the valves can also effect what size lash pad should be used to obtain the correct "wipe area" on the rocker arm and the correct "lift value at the valve". The following is an example to show the math involved in determining the correct lash pad thickness required. FORMULA: Use the following example and plug in your own numbers. Base circle diameter of your camshaft .___ subtracted from the constant 1.310 = .____ divided by 2 = ___ + original lash pad thickness of .078 = ___ new lash pad thickness starting point. Select a lash pad thickness from our stock as close to this thickness as possible.