Skip White Performance - We have the best prices you will ever find for aluminum heads, rotating assemblies and strokers
Skip White Performance
3349 E. Stone Dr.
Kingsport, TN 37660

Mon.-Thurs. 8a-7p EST
Friday 8a-3p EST
Sat 10a-3p EST
(seasonal; call to confirm)

5 star rating
272,950+ reviews!





Product Information

Product TypeShipped Product
Shipping Cost $250
Number of reviews 0




2pc. Rear Main Seal. This block has 350 mains. Be sure of what size mains you require before purchasing this. We do not offer this block with 400 mains at this time.

This block kit is fully machined. Bored, honed and decked. Stroker clearanced for up to 4.00 stroke. We also offer this block finished out at 4.030, 4.125 and 4.165. Upon special request, we can finish out up to 4.185.


You may add items into your shopping cart but in order to check out you will have to call us. Our check out feature on our website is being upgraded at this time. We can take your order over the phone and answer any technical questions you may have. We accept all major credit cards, cash, check, and money orders. Just give us a call at 423-722-5152 and we can process your order promptly. In the event you attempt to reach us outside of our operating hours, please leave us a detailed message and we will return your call at our earliest opportunity.

Pictured below is the new Dart SHP block. This block is the absolute ultimate in quality, durability, and value.

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This block has 350 mains. Be sure of what size mains you require before purchasing this. 

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This is a file photo. Actual appearance may vary. 

This is the style block we use on all of our 377, 406, 421, 427, and 434 engines. We have built engines in the 900 hp range using these blocks with no problems.

Block Specs. 

  • Dart SHP Block
  • 2pc rear main seal
  • Splayed 4 bolt center caps

The block is bored to size with our new Centroid touch probe machine. Few machine shops have a machine of this accuracy.

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We also deck the blocks to an RA finish of approx. 15 or better. The decking procedure is also done by our Centroid CNC machine. 

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We often find many brand new blocks to have a sloping deck of up to 4 thous. When we're finished decking the block it is within approx. .001 accuracy from end to end. Many machine shops fail to catch this as the machinery they use does not allow for such accuracy.

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We then plate hone the block with our new Sunnen SV15 diamond hone machine. This is also a very advanced machine that hones the block with a finish unlike conventional machines.

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Pictured below, Preparing the block in our Centroid cnc machine for precise notching to clear a 4.00 stroke crank.

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 You must thoroughly wash your block before assembly. This is to assure that the block is free of contaminants.



Block prep package: We de-burr the block, hone the lifter bores to spec, chamfer the top of the cylinders, and lifter bores, and install the special Dart cam bearings and freeze plugs. The block is then thoroughly cleaned in our block washing machine. We find this upgrade essential for those lacking the proper equipment or knowledge to perform this correctly. See our other listings for this upgrade. 

Cost of this block prep package is $250.00 

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The blocks are washed in a dedicated block cleaning machine.

Pictured above is the final rinsing and drying to remove the cleaning solvents.

A final note.

Our eBay user id is: skipwhite, and our eBay store name is whiteperformance1. You may have noticed other sellers using a similar name offering similar products. These other sellers have capitalized on our name as we see it, and many customers searching for us will inadvertently find them, thinking we are one in the same company. There is only one "Skip White." We are the original premier eBay seller under this name since approximately 2003. We have no other eBay names, nor are we associated with any other company regardless of the similarity in the name or location. Our official company name is Skip White Performance. Please see the article below for a more detailed explanation.

The real story...Skip White Performance vs. White Performance & Machine

I'm sure many of you have noticed there are 2 high performance engine builders in Kingsport, TN with similar names, and this has led to a great amount of confusion.

We are Skip White Performance, NOT White Performance and Machine. 

Due to the name similarity many customers looking for us online inadvertently find them, thinking we are the same company. Definitely not...there is no connection between the two companies. We don't have a problem with free enterprise (competition). However, when the competition builds their foundation on such things as a name similarity and their supposedly long history of being in business, then we think it's about time we set the record straight.
We have owned White Performance since 2003, with the exception of the machine shop, which was owned by Fred White at the time. He continued to operate the machine shop and build engines for us while we continued selling online under the eBay user ID of skipwhite and the eBay store name of whiteperformance1.
Due to their limited production capability and many disagreements about the engine building process and workmanship, we opted to open a full scale machine shop of our own a few years later. Fred White began competing against us even though our contract had a non-compete clause in it.
As our business grew, we opened a second, much larger warehouse and machine shop around 2011, located on Brookside Ln. in Kingsport TN. By putting heart and soul in this company, we have become the number one street rod engine builder in the nation.
Fred sold his shop to an investor in 2016 and the new owners continue to reap the benefits from this confusion between the two shops. This investor lacks any knowledge of this industry. They continue to use the White Performance & Machine name. Contrary to what is posted on their website, Fred White is no longer associated with the company in any way. Their main spiel in advertising is, "In business since 1979," when in fact, we purchased the White Performance company in 2003, with the exception of the machine shop. 
All in all, we have been in this business 16+ years. Skip White's passion has been owning and building street rods for 47 years on a personal level. The knowledge he has gained over time has allowed him to venture into this business and succeed to a very high level.
The great pretenders continue capitalizing on our success due to the name similarity, but have been degrading our reputation. Recently, we have been getting calls nearly on a daily basis from people that now realize there are two shops in this town with very similar names. They complain of serious problems in getting their engines in a timely manner from them. They think they purchased their engine from us. Due to the confusion, there is an increasing amount of negative talk that is starting to reflect on our reputation within the street rod community, when in fact we have a near perfect reputation in this industry. We have an "A+" rating with the Better Business Bureau and we have maintained the A+ rating for many years. 
FAST FORWARD TO 2019...We have become the largest street rod engine builder in the nation. Our engines, rotating assemblies, and cylinder heads are built to very high standards and shipped to our customers in a timely manner. We are a premier seller on eBay with a positive feedback score of well over 206,000 and growing, as compared to our competitor’s score of approximately 24,000.
Our engines are custom-built to our customers' specifications and are shipped in approx. 2-4 weeks, perhaps sooner, depending on the season. Our rotating assemblies usually ship out in about one week or less, and our heads ship in about a week or less.

Now you know the real story, and we hope this helps with the confusion.


    • We are not responsible for collateral damage caused by the use of this product.




Should a problem occur, please contact us. If a return is necessary, please contact us for an RGA number and return authorization. The RGA number must be included on the return label. If an item is returned without an RGA number, it will not be processed. A full description of what the problem is needs to be included with any returned product with your contact info, and proof of purchase. Even though you may have explained the problem to us, and been granted permission to return the product, we must have a written explanation and a contact number included with the product. It is also recommended that you include the name of the person from our company that you have been in contact with. You must send the item back to us in a trackable manner (USPS Priority Mail, FedEx, etc.) and keep the tracking info of the returned product. Please give ample time for returns to be processed. Following these guidelines will make the return process work as it should. 






We now offer a flat rate shipping fee on this short block kit. The shipping price listed in the ad is for the continental US only. This price only covers delivery to a business with the ability to unload without the use of a lift gate service. We can deliver this item to a residence and offer lift gate service, but this would be at an additional cost. Contact us for the details. We can also ship this item anywhere in the world outside the continental US, but this will be at an additional cost. Contact us for the details. We do have the best shipping rates for overseas delivery. This item will be fully insured at no additional cost.


We offer great discounts on shipping. You only pay the full shipping fee on the highest shipping cost of your items, and half price shipping on all additional items. (However, half-price shipping on additional items does not apply to heavy items like engines, short blocks, etc.)  Few offer discounts on shipping such as this. Contact us using the "Ask A Question" tab if you would like us to calculate your shipping cost on multiple item orders. You may also request an invoice at time of checkout. We will answer your eBay message within one business day in most cases, so keep shopping and pay half price shipping on all additional items. Our checkout system will automatically calculate your shipping discount at time of payment, so long as you consolidate your payment.


If you checkout and start over, the auto calculator will not recognize the multiple purchases, and there will be no shipping discount. Should you decide to start purchasing again after checking out, you will need to contact us so we can calculate your shipping for you.


The half price shipping on all additional items only applies to items that are being shipped in the 48 continental United States.





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