Will your pistons work with press fit rods?

When using press fit connecting rods, verification of proper pin to rod eye interference is required. Do not use supplied retaining rings when using press fit rods. On full floating applications make sure the lock rings are sealed completely against the O.D. of the lock ring groove. Full floating applications use double lock rings ( 4 per piston).

How much boost or nos will these pistons handle?

D.S.S. Racing Pistons are as strong as any piston on the market today.  When using power additives to increase HP, common sense should rule the day.  Properly tuning your engine is vitally important when preparing for extreme  applications.  Realizing how much Boost or NOS you are able to tune for is equally important as piston choice.  If you feel that you are able to prepare an engine for Boos or NOS, it is wise to choose pistons designed for such extreme use.  Our GSX and XR pistons have features like shallow ring grooves and extra skirt support for increased strength and heat displacement.  Increased milling for weight reduction and a choice of alloy are also standard with the GSX and XR pistons. The  XR Series are completely customizable and built exactly for your application.  Remember, any aluminum piston will melt at 1,300 degrees - the skilled tuning of an engine is critical to success and piston life.

What should I end gap my rings to?

Please refer to these sites for answers on ring gaps, as well as many other questions regarding rings:
Hasting Piston Ring FAQs   |  Total Seal Piston Ring Chart

How much piston to wall clearance should I run?

D.S.S. pistons are produced with the piston to wall clearances built in. Boring and honing the cylinder block to the specified oversize will typically yield the best results. (IE a.4030 piston should be in a 4.030 to 4.031 bore). Suggested piston-to-wall clearance on a 4.6 / 5.4 Modular engine is .002" to .004". Suggested piston-to-wall clearance on a typical 4.00" bore engine is .003" to .005". When setting piston to wall clearance measure the piston at the center of the skirt perpendicular to the piston pin.

Are your Pistons pin fit?

D.S.S. SX and GSX Series pistons are pin fit. Engine builder preference and exact application should dictate final piston pin clearance. Typical range of clearance would be .005 to .001 depending on the application. Your engine builder is responsible for checking and setting this clearance for your specific application. We recommend .0008 on most .912-.927 pin applications and .0005 on most smaller pins.

What is the purpose of the X groove?

D.S.S. Racing's Patented X Groove does exactly what engine builders have been striving to do for years: reduce fuel washdown and break-in debris while improving ring seal and power. The X-shaped groove sweeps excess fuel and foreign matter into the oil drainback holes on the down stroke and into the side relief on the upstroke. This keeps the debris from getting trapped between the piston skirt and the cylinder wall, where it would normally cause scoring damage. In a world where exotic fuels, blowers, Turbos and NOS are required, the X Groove is essential in maximizing power and efficiency while providing unparalleled protection.

Why don't your pistons come with rings?

Most piston manufacturers issue generic rings with their pistons.  D.S.S. does not believe that 'one size fits all' when it comes to rings, and therefore we don't include them with a piston purchase.  Once we know your intended engine application, we will suggest the rings best suited for that application.

Should I consider a pin upgrade?

Our standard pins can put up with 800HP under normal conditions.  That said, if you intend to generate more HP and will be operating in more extreme conditions, a pin upgrade is advised.

Should I use spiral locks ?

Most D.S.S. Racing pistons are engineered to use both types of pin retention clips, giving the engine builder a choice. We include Tru Arc type pin retention clips wit most of our pistons. which installed properly provide excellent pin retention. Many engine builders prefer this retention method for its ease of installation and removal. If you or your engine builder prefer a Spiro Lock type retention system, it is available.

Which series of Dss piston should I get?

Which series of pistons should you get?  Other questions quickly follow this one - What is the intended application for your engine? Are you a beginner just starting to learn the ins and outs of engine building? Are you building an engine that will operate in moderate circumstances or normal traffic speeds? Are you building a racing engine that is expected to repeatedly generate extreme HP? Obviously, budget concerns often make choices for us, but in the case of piston buying, spending less for a racing engine may result in a heartbreak. Our E and SX series are suitable for projects designed for moderate use, while our GSX and XR pistons can easily handle more extreme conditions and feature our patented X Groove for extended piston and cylinder life.

How big of a cam can I run?

D.S.S. Forged Pistons typically allow the use of aftermarket heads with larger valves and high-lift cams. We recommend, however, that you mock assemble and check your parts combination. There are too many variables to assure piston to valve clearance will not be a problem on your combination. (excessive valve margins, excess milling of the heads or decks of the block, very aggressive ramp profile on the cam, etc.). Your engine builder should check and correct piston to valve clearance as a matter of sound engine building practice.

Who really makes your pistons?

D.S.S. Racing is the OEM for our forged pistons. They are proudly forged and machined in the USA - St. Charles, IL to be exact. In addition to forging and machining, D.S.S. employs extensive quality control options, speedy concept-to-implementation schedules, in-house R&D, and many cost-affective solutions. D.S.S. is also proud to be a 'Green' company, committed to improving our environment with our practices, efficiency, recycling and conservation.

Where do I mic D.S.S. pistons?

D.S.S. pistons are produced with the piston to wall clearances built in. Boring and honing the cylinder block to the specified oversize will typically yield the best results. (IE a.4030 piston should be in a 4.030 to 4.031 bore). Suggested piston-to-wall clearance on a 4.6 / 5.4 Modular engine is .002" to .004". Suggested piston-to-wall clearance on a typical 4.00" bore engine is .003" to .005". When setting piston to wall clearance measure the piston at the center of the skirt perpendicular to the piston pin.

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