We have shim sets available for rent. Please note that these rental kits do NOT include the tools.  They are available for purchase separately.  We do not rent the tools, since they pay for themselves the 2nd time they are used.

 

These shim kits have been designed by well-known SHO Guru Gary Morrell, and come in sets of 56 shims.

 

You rent the shims for three weeks and then return the set with all the unused shims and all the shims you took off the car to have your deposit refunded.

 

The factory sets the valve clearances in the middle of the range: 6-10 thou intake, 10-14 thou exhaust. Although the clearances increase over time, leading to the need for thicker shims, they also have to allow for the valves to bed in from new, leading to smaller clearances.

 

Once the valves have bedded in, it is common practice to set the clearances at the lower end – 0.006” intake and 0.010” exhaust - so you will probably replace all 24 shims. This gives you slightly higher valve lift leading to a little more power, and prolongs the service interval.

 

Shims come in different sizes. There is a 4-digit number on the underside of each shim that gives the thickness in mm. For instance, a 2500 shim is 2.500 mm thick. The next thickest shim is 2525 (2.525 mm or roughly one thou thicker).  Note that shims do NOT wear, i.e. they do not get thinner with time/use – they only get damaged, which requires flipping to re-use or replacement (see below).  It is the cams that wear (or the valves that seat) which is why an adjustment is required.

 

The 56 shim set contains the following sizes:
 

Gary Morrell Shim Rental Kits

Size

Suffix to

Kit Quantity

Availability

New/Used

(mm)

E9DZ-6515-

56

2.375

S

0

Gone

 

2.400

T

0

Available

Used

2.425

U

0

Available

Used

2.450

V

2

Available

Used

2.475

W

4

Available

Used

2.500

X

6

Available

New/Used

2.525

Y

8

Low

Used

2.550

Z

36

Available

New/Used

2.575

AA

0*

Gone

 

2.600

BA

0*

Gone

 

2.625

CA

0*

Gone

 

2.650

DA

0*

Gone

 

2.675

EA

0

Gone

 

* We still have a few of these sizes in currently-rented kits, but there is no guarantee that your kit will get them - we can only send them out as we get them back.

 

 

Notes on Used Shims

 

For the used shims in the kits, we make sure that at least ONE side (including the bottom side) is good.  Note that shims can be used either side up.  They can be used side up (with the number on the underside) as long as the surface is mirror smooth without any scratches or nicks. If the top surface is damaged,  (and there may be some in the Rental kits) the shim can be flipped over so the bottom is now up, and the shim number written on the other side with a permanent marker as the factory number will wear off.

 

Note that we feel that a used shim is perfectly fine to put back in your engine, provided the surface is mirror smooth without any scratches.  A good way to check for scratches is to lightly run the tip of the pick over the surface.  If it catches on a scratch, then that shim should be flipped.

 

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