High Quality Aluminum. These Cam Tower Shims are precision machined. Cam Tower Shims are used to make the upper chain tight again when a cylinder head has been overly-planed. It should be noted that most of the time cylinder heads are surfaced on the bottom. However, there are times when they are surfaced on the top. It may be necessary to use our Shims in conjunction with one of our thicker head Gaskets to restore accurately the same amount of material to each side of the cylinder head that was removed. Click here, to view the thicker U20 head gasket.

Sizes available:

.025 Order by PART# 1152A

.030 Order by PART# 1152B

.040 Order by PART# 1152B4

.048 Order by PART# 1152C

.063 Order by PART# 1152D

Rated at a tensile strength 190,000 to 200,000 PSI. Material 8740 Chrome moly. U.S. made. These studs eliminate problems associated from head bolt use. Common problems include bolt breakage, block and thread damage, less clamping force and bolt stretch, constant re-torquing of cylinder head, rear oil gallery leakage. Keep that head from moving around. Torque spec. 65 Ft Lbs Moly lube. 80 FT Lbs. Oil.

Please be sure to tap out the block before installing with a 7/16" X 14 tap. These are studs are a free floating fastener so it is not necessary to Lock Tite or bottom out and torque the studs into the block. However, it is important to have as much threaded engagement in the block as possible.

SPECIAL NOTE: Original U20 head bolts were un-heat treated and have a tendency to stretch and or break off in the block. Early head bolt head diameter measures .622. Later, better quality replacements that are no longer available, measure .702. If you have the early head bolts we strongly recommend replacement.

SPECIAL NOTE: All of the head bolts on the passenger side of the block are the same length. It is not necessary to be concerned about the stud length where the, cylinder head, locating dowels are placed. We have found that there is enough, threaded engagement in the block, to allow a proper torque.

Lots of extras just like our full engine sets featuring nitrile heat resistant rubber gaskets.

Here are your gaskets as pictured: Premium cylinder head with sealing material front and back, .093 metal sheath composite int/ext, .093 3 hole collector for header, valve cover, inspection cover, PCV fitting, upper tensioner, 8 - valve stem seals, 2 - valve cover grommets, Nitrile rubber oil cap, nitrile radiator cap, 2- thermostat housing with metal ground tab, 4 - .062 phenolic, 2 - Nitrile rubber carb to air filter. Carb phenolic block gaskets

Lots of extras just like our full engine sets featuring nitrile heat resistant rubber gaskets.

Here are your gaskets as pictured: Premium cylinder head with sealing material front and back, .093 re-usable metal sheath int/ext, .093 3 hole collector for header, valve cover, inspection cover, PCV fitting, upper tensioner, 8 - valve stem seals, 2 - valve cover grommets, Nitrile rubber oil cap, nitrile radiator cap, 2- thermostat housing with metal ground tab, 4 - rear carb insulator phenolic 4 - front carb insulator phenolic, 2 - carb to air filter.