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Cylinder Head U20
Partnumber: 1152
Datsun Roadster U20 Cylinder Head Cam Tower Shim - Set

U20 CAM TOWER SHIMS

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

$54.00

Cylinder Head U20
Engine 2000
Partnumber: 1190
Datsun Roadster 2000 Head Stud Kit

U20 High Performance Block Stud & Nut Kit. Far superior to original head bolt method of fastening the head to the block. No needless re-torquing of the head required. NOTE: Re-use your old washer set.

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.

$138.98

Gasket Engine
Cylinder Head U20
Partnumber: 1332
Datsun Roadster SUPER DELUXE SU U20 Head Gasket - Set

67 1/2 - 70 SU U20 Quality Head sets

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



NOTE: To order this kit with the thicker, Part# 1698 U20 head gasket, Order by PART# 1332TSU - $367.00
$200.00

Cylinder Head U20
Gasket Engine
Partnumber: 1333
Datsun Roadster SUPER DELUXE U20 Solex Head Gasket - Set

67 1/2 - 70 SOLEX U20 Quality Head sets

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.



NOTE: To order this kit with the thicker, part#1698 U20 head gasket, ORDER by Part # 1333TSOL - $366.36
$199.36

Cylinder Head U20
Partnumber: 1489
Datsun Roadster 2000 Cylinder Head Retainer Lash Pad - Set

U20 Lash pad set (8)
$32.00 SET

Cylinder Head U20
Gasket Engine
Partnumber: 1490
Datsun Roadster 2000 Valve Cover Grommet

U20 Valve cover grommets. 2 required per car.
$4.80 EA

Cylinder Head U20
Partnumber: 1494
Datsun Roadster U20 Intake Valve Seats

U20 replacement premium quality intake valve seats. Theses seats replace the stock brass seats which are prone to dropping out causing damage. Composition: 42.0% Nickel, 7.5 % moly, 12.0% chrome, 3.0% silicon, 2.10% carbon, 2.0% vanadium remaining % iron & other elements. Be sure to replace the old brass seats at you next dis assembly. Sold as a set of 4.

The O.D. of these seats are slightly larger than stock to, .003 to .004, to allow for the proper press fit into the cylinder head.
$54.00 set

Cylinder Head U20
Partnumber: 1499
Datsun Roadster 2000 Camshaft - Choose Your Grind

Order by the following part numbers below in BLUE:

.447 lift at the valve 280 duration - Good Su replacement with more duration. Can also be used with Solex set up for more bottom end performance - 1499FE

.478 lift at the valve 290 duration Hot SOLEX street cam #1 - 1499IA

.475 lift at the valve 300 duration - SOLEX Auto cross cam #2 1499GA

NOTE: When ordering any of the above camshafts be sure to ask for our recommendation of a corresponding lash pad thickness.

EXCHANGE REQUIRED
$169.00

Cylinder Head U20
Partnumber: 1500
Datsun Roadster 2000 Rocker Arms - Set of 8

U20 reground two piece rocker arm. Set of 8.

NOTE: Exchange required.
$128.00 (8

Cylinder Head U20
Partnumber: 1501
Datsun Roadster 2000 Rocker Arm

U20 new two piece rocker arm.
$49.00 EA

Cylinder Head U20
Electrical Switches
Cooling
Partnumber: 1532
Datsun Roadster Water Temperature Sender Nut

671/2 - 70 1600 and 671/2 - 70 2000. Cylinder head water temperature sending unit nut and thermostat housing nut in the case of the 2000's.
$7.90

Cylinder Head U20
Cylinder Head G15 R16
Engine external
Partnumber: 1627
Datsun Valve Cover Oil Filler Cap

Oil filler cap from Nissan. The gasket this comes with is cork. See our exclusive replacement part#1277. Click here to view this part.
$16.00

Cylinder Head U20
Partnumber: 1662
Datsun Roadster 2000 Intake Valve

2000 Intake valve.
$19.00 EA

Cylinder Head U20
Partnumber: 1663
Datsun Roadster 2000 Exhaust Valve

2000 Exhaust valve.
$32.00EA

Cylinder Head U20
Partnumber: 1665
Datsun Roadster 2000 Aftermarket Valve Spring Set

2000 Heavy duty Valve spring set. 8-inner and 8-outer springs. Click here, to view stock Nissan springs. Installed height 1.620. Spring rate is 110 lbs. Computations by Degroff's cylinder head service.
$60.00

Cylinder Head U20
Gasket Engine
Carburator Mikuni Solex
Gasket Carburator
Partnumber: 1671
Datsun Roadster U20 Mikuni / Solex Intake Water Tube Gasket

Solex Intake manifold water tube. 2 required per car.
$6.00 EA

Cylinder Head U20
Cylinder Head G15 R16
Engine Seals
Partnumber: 1692
Datsun Roadster Valve Stem Seal Set Of 8

671/2 - 70 Valve stem seals (8).
$30.04



Gasket Engine
Cylinder Head U20
Partnumber: 1698
Datsun Roadster U20 Thicker Graphite Head Gasket

1st photo. Nissan stock graphite gasket on the left, New thicker graphite gasket on the the right.

No longer necessary to purchase, difficult to seal, all copper head gasket, messy and marginal double head gasket method to compensate for overly planed cylinder head castings. Have you priced out a new U20 cylinder head these days? How about $1800.00. None of these choices are really an option, except for the new cylinder head which may not be in your budget. We have a affordable option!

This all new gasket is .094 thick compared to the Nissan stock gasket which measures .053 at the fire ring.

Why buy a thicker head gasket? During a U20 cylinder heads life span it can be surfaced many times to the point where the head is nearly unusable. If your head has been overheated and warped it requires either oven straightening, expensive, or a re-surfacing of both sides of the head in order for it to be flat again. Because both sides need to be surfaced the head becomes thinner. Customers and shops often correct the reduction in overall head thickness by piling cam tower shims under the towers to "get the chain tight". The problem is that this can effect the geometry between the cam and the rocker arms. Yes, this can be corrected with different U20 custom retainers that accept taller L-series lash pads of various thickness. Even with a custom retainer package this still does not solve the problem of diminished chamber volume on the head gasket side resulting in higher compression and detonation.

This new gasket gives you the opportunity to correct the issue of a overly planed cylinder head by putting the height back where it was removed. Use this in conjunction with our cam tower shim sets to get the right combination.

Breath back life into your cylinder head! Comes with a detailed instruction sheet and great front timing cover/oil gallery sealing information.

We recommend that you purchase a tube of the special silicone we sell part#2402 to help seal the front timing cover area and the rear oil gallery of the cylinder head gasket

Gasket construction and properties: High performance graphite facing, much like the Nissan stock gasket, on a perforated carbon steel core. Stainless steel fire rings installed at each bore. Graphite has excellent sealing, conform ability and high temperature resistance.

NOTE: We highly recommend our U20 performance stud kit as it is superior to the original head bolt kit.
$218.00

Cylinder Head U20
U20 Carburator
Engine external
Partnumber: 1750
Datsun Roadster 2000 Su Pcv Hose

67 1/2 - 70 SU 2000 Positive crankcase ventilation hose. These are being supplied two ways. With outer cloth over rubber and also with outer rubber with inner cloth.
$59.00

Carburator Mikuni Solex
Cylinder Head U20
Engine external
Partnumber: 1751
Datsun Roadster Solex Pcv Hose

67 1/2 - 70 Solex carburetor positive crankcase ventilation hose. These are being supplied with outer cloth and rubber with inner cloth.
$59.00

Cylinder Head U20
Partnumber: 1820
Datsun Roadster U20 Exhaust Seat rings

U20 premium quality exhaust Seat rings. Made of a superior alloy over the originals which are iron.Composition: 42.0% Nickel, 7.5 % moly, 12.0% chrome, 3.0% silicon, 2.10% carbon, 2.0% vanadium remaining % iron & other elements. Sold as a set of 4.

The O.D. of these seats are slightly larger than stock to, .003 to .004, to allow for the proper press fit into the cylinder head.
$54.00 set

Cylinder Head U20
Partnumber: 1838
Datsun Roadster U20 Bronze Guides - Set Of 8

U20 Silicon bronze guides (8). In photo Intake on top/Exhaust below. Nissan guides were brass. Proper guide press fit is essential in rebuilds. Loosing a guide in older engines is more common depending on how many rebuilds have been performed. These guides are slightly oversize on the O.D.
$98.00 SE

Cylinder Head U20
Partnumber: 2109
Datsun Roadster U20 Nissan Valve Spring - Set

Nissan valve spring kit.8 inner and 8 outer springs. Click here, to view aftermarket heavier rate spring set. Installed height 1.620 58lbs. Computations by Degroff's cylinder head service.
$200.00

Cylinder Head U20
Partnumber: 2110
Datsun Roadster U20 Valve & Valve Spring Set - Nissan

U20 Valve and Valve spring kit from Nissan. 24 piece kit.
$380.00

Cylinder Head U20
Partnumber: 2112
Datsun Roadster U20 Heavy Duty Aftermarket Valve Spring & Nissan Valve Set

Datsun Roadster U20 Heavy Duty aftermarket valve spring set with Nissan Intake and Nissan exhaust valves. 24 pieces.
$256.00



Cylinder Head G15 R16
Cylinder Head U20
Exhaust
Partnumber: 2208
Datsun Roadster Smog Plug Insert - Set OF 4

Datsun Roadster, set of four, smog plug inserts for 68 -70 1600 and 2000 cylinder heads.

These inserts were reverse engineered to screw into the ports in the head where the air injectors were installed as smog equipment. They have the exact thread and contour of the injectors and fill the entire cavity; both the threaded portion and the smooth bore. This completely eliminates that annoying “chirping” sound caused by engine exhaust passing over the tube, which creates a resonant chamber (like a badly played flute). Once installed, you’ll be amazed at hearing only the smooth hum of the exhaust out the tailpipe. The clucking chicken in your engine will be dead and gone! Does not include clucking chicken. Comes with a full detailed instruction sheet.

NOTE 1st PHOTO: The 1st part in the row is the original exhaust injector. It is in the photo group to show what is in your car that you will be removing and is for reference only.

Choke the chicken today!!
$37.00

Engine external
Cylinder Head U20
Exhaust
Partnumber: 2275
Datsun Roadster 67 1/2 - 70 2000 66 Piece Fastener - Kit

Datsun Roadster metric fastener kit. Included in the kit are the special M8 X 1.25 NUTS. These are the uncommon style nuts that accept the 12 mm wrench. All the correct washers, including the thick exhaust manifold washers are included as well. Kit does the entire intake and exhaust manifold. The fasteners for the carburetors are also included in the kit.
$24.90

Cylinder Head U20
Cylinder Head G15 R16
Engine 2000
Engine
Partnumber: 2464
Datsun Engine Fastener Assembly Lube

Use this, moly based, assembly lube with all our engine fastener kits. Be sure to use the published moly torque ratings in our web-site when using this formula.
$3.95

Cylinder Head U20
Partnumber: 2510
Datsun Roadster 2000 Race Valve Set of 8

Over size U20 Stainless Steel Racing Valve set. Intake on the left and Exhaust on the right. Swirl polished intake and exhaust valves.

Intake diameter 1.910 - Original Nissan diameter 1.815

Exhaust diameter 1.500 - Original Nissan 1.420
$300.00
Cylinder Head U20
Partnumber: 2511
Datsun Roadster U20 Oversize Valve Seat - Set of 8

Oversize racing valve seat set for part #2510 stainless steel valves. These seats are made of the same material as the stock size replacement U20 valve seat inserts we offer that are located in this same section.
$110.00

Cylinder Head U20
New Products
Partnumber: 2551
Datsun Roadster U20 Thicker Lash Pad Sets - (SET OF 8)

Heat treated, correct width for stock U20 retainer, lash pad sets. Works great with re-ground cams, especially cams that have been ground many times with reduced base circles, to correct the geometry between the rocker arm and the camshaft lobe. Selecting the correct thickness allows one to match the theoretical lift on paper with the actual dial indicated lift during mock up and assembly.

PHOTO: The 1st lash pad on the left is a stock U20 lash 2.0mm / .078

The following parts numbers are for each lash pad from left to right starting with the second lash pad:

2.5mm / .099" Order by PART# 2551A

2.7mm / .107" Order by PART# 2551B

3.2mm / .126" Order by PART# 2551C

3.4mm / .134" Order by PART# 2551D

3.5mm / .138" Order by PART# 2551E

4.0mm / .158" Order by PART# 2551F

4.2mm / .166" Order by PART# 2551G

4.5mm / .178" Order by PART# 2551H

LASH PAD SELECTION NOTE: We include a note with each camshaft recommending a lash pad thickness at the time of purchase. Our recommendation for a specific lash pad size will work if all of the other factors, listed in the following text, are held to original specifications. Camshafts are listed at part # 1499. To figure out which lash pad to select based on a camshaft you have purchased from someone else please use the following formula. (Be aware that valve length, seat depth - installed height and individual ground or new rocker arms can affect geometry thus rendering a different lift value "at the valve" other than the theoretical lift values based on the cam card lobe lift multiplied by the 1.396 rocker arm ratio) FORMULA: Use the following example and plug in your own numbers. Base circle diameter of your camshaft 1.240 subtracted from the constant 1.310 = .070 divided by 2 = .035. .035 + original lash pad thickness of .078 = .113 . Select a lash pad thickness from our stock as close to this thickness as possible. Lash pad thickness required for your camshaft, which in this example, would be Part# 2551B.


SPECIAL NOTE: Not all the the lash pad thicknesses listed are appropriate for the U20 as some are used only on Mercedes motors.
Choose your lash pads with care as they are NOT returnable.
$89.00 SET

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