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Lisle 21100 Large Valve Lapper

4.4 out of 5 stars 36 customer reviews

Price: $8.44 & FREE Shipping on orders over $49. Details
Only 10 left in stock (more on the way).
Ships from and sold by Amazon.com.
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  • Thick handles for easy lapping
  • 1-1/8" and 1-3/8" Diameter cups for larger valves
  • Unique locking tab positively secures cups to sturdy handles
  • Eliminates slippage
  • Skin-packed
45 new from $5.05
$8.44 & FREE Shipping on orders over $49. Details Only 10 left in stock (more on the way). Ships from and sold by Amazon.com.

Frequently Bought Together

  • Lisle 21100 Large Valve Lapper
  • +
  • Permatex 80037 Valve Grinding Compound, 3 oz.
  • +
  • Permatex 81950 Ultra Slick Engine Assembly Lube, 4 oz.
Total price: $20.12
Buy the selected items together

Product Information

Technical Details

Brand Lisle
Item Weight 4 ounces
Product Dimensions 10.5 x 3.6 x 1 inches
Item model number 21100
Manufacturer Part Number 21100

Additional Information

ASIN B0009OR8TS
Customer Reviews
4.4 out of 5 stars 36 customer reviews

4.4 out of 5 stars
Best Sellers Rank #80,161 in Automotive (See top 100)
#6 in Automotive > Replacement Parts > Engines & Engine Parts > Engine Parts > Valves & Parts > Adjusters
Shipping Weight 2.4 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available July 20, 2005

Warranty & Support

Warranty, Parts:Parts

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Product Description

Valve lappers are used for hand lapping valves. This is another quality product brought to you by Lisle.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By jason on December 7, 2012
Verified Purchase
i ordered this large one thinking it was what i needed but in fact i needed the small one. The measurements given in the product description are of the suction cup size unexpanded. So when i measured my valves this seemed like the one i needed but it ended up hanging over a bit on the smaller exhaust valves. Bear this in mind before purchase. it gets roughly 25% larger cupped down on the valve.

The grip is great on this thing until even the smallest bit of lapping compound makes its way onto it and then you'll start to fight it. keep it clean before every suction and you'll be home free.
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It's hard to write a review for something like this. It's a stick with a suction cup on either end, and one cup is just a little larger than the other. It worked for me when I used it to seat the valves in my car. But reviewing something like this is a lot like reviewing a standard screwdriver. It works.
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I've used this lapper for a bit now and as long as you take care of the rubber it holds to the valve face well. Don't get any solvents on the rubber if you want this to continue. The small cup is good for most valves on modern cars though it is too large for some motorcycle valves I've encountered.
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Product could use some improving . rubber boots fell off , Wood could be sanded smooth ,could be more robust in construction...
If you need this to do an 8 cylinder head job Good Luck...

It got me through 4 valves , threw it away...
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I have hand lapped valves since I rebuilt my first engine in 1963. These same tools have been around even longer that that and yet they still do the job. Just be aware time is the enemy of this rubber; meaning these will not last more than 3 or 4 years; but for the price you can afford to throw them away and buy new each time you need them.
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A very nicely formed tool, however the description is wrong, the handle is actually a hard plastic not hard wood ( also does not have Made in USA stamped on it - but the packaging still says the item was made in the USA ).
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Nice tool, suction cups are quality and stuck to valves like they are supposed too. The smart tip is to use water base lapping compound instead of oil base so the cups adhere better and cleanup is much easier.
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This tool worked great when refreshing a set of 4.0L V6 Ford heads on my explorer. I've seen comments about them not sticking to the valve, and I have to say those people simply didn't properly prep the valve. First I took a brass wire brush in my drill to clean all the carbon deposits off the valve, then wiped each valve down with wax and grease remover. The tool might shift around if you lap aggressively, but it was rare in my application. Simply put, it works perfect!
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