High Quality Aluminum or Copper. These Cam Tower Shims are precision machined, not stamped. Shims span entire width of Cam Tower machined from the same thickness stock. 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. Sizes available: .020, .032, .040, .050, .060, $40.00 per set.

Special order sizes available: .010, .016, .025, .027, .043, .0485, .054, .062, .064, .071, .077, .086, .088, .093, .100. $58.00 per set

NOTE: Cam Tower Shims can come with U20 full gasket set at a discounted price. Be sure to specify if you need them and which size when ordering!

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 retorquing of cylinder head, rear oil gallery leakage. Keep that head from movin' around. Torque spec. 65 Ft Lbs Moly lube. 80 FT Lbs. Oil. See part#1955 for Nissan original Head bolt kit.

3rd run now has allen key in the long stud as well to make threading into the block easier.

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 neccessary to lock tite or bottom out and torque them into the block.

Lots of extras just like our full engine sets featuring re-usable gaskets and nitrile heat resistant rubber gaskets. You build the set you need!

Parts pictured left to right, top to bottom here are your gaskets: 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, 2- thermostat housing with metal ground tab, 4 - .062 phenolic, 2 - nitrile rubber carb to air filter. Carb phenolic blocks with gaskets attached available...just ask.

Lots of extras just like our full engine sets featuring re-usable gaskets and nitrile heat resistant rubber gaskets. You build the set you need!

Parts pictured left to right, top to bottom here are your gaskets: 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, 2- thermostat housing with metal ground tab, 4 - rear carb insulator phenolic 4 - front carb insulator phenolic, 2 - carb to air filter. Carb insulators available separately...just ask.

Newer style extended fitting helps keep your U20 breather hose from falling off.