Our custom made
Wiseco pistons have a compression height that is .010 taller than nearly all
catalog pistons on the market. We find this to be a very valuable feature.
Since our pistons sit at a taller than normal compression height, you will only
have to remove approx. .005-.010 off the deck surface of a virgin block to
achieve a zero deck. This also allows for future deck re-surfacing and still
not ending too far below stock deck height.
Leaving the deck on your block
thick makes for a stronger block that resists flexing and also runs cooler, as
the deck thickness has a lot to do with the dissipation of heat. Blocks with
decks cut down to any great amount are also prone to cracking. This is why our
pistons are designed to sit flush, (zero deck) at .010 below stock deck height.
Since nearly all bbc catalog
pistons on the market sit .020 below the surface of a virgin block, the only
way to achieve a zero deck using such pistons would be to cut .020 off the deck
surface. This compromises the integrity of the block, in our opinion. Should
you decide to leave the block deck higher up, using such pistons creates a new
issue of having a very poor quench/squish zone. The only way you could really
take advantage of a catalog piston is by having a block that needs to or has
already been butchered down to 9.780 deck height. Having the piston sitting
flush with the deck is very desirable, regardless of the fact that your overall
compression ratio is slightly higher than if it were sitting below the
We have found that 95% of our
customers are using a virgin block or a block that is close to stock deck
height. This is why we have designed our pistons to have a taller compression
height. On very rare occasions, you may end up with a block that has the piston
out of the hole by a few thousandths and this not a problem at all. Most head
gaskets are approx. .040 thick, and should you end up with a quench zone of
.035, then that is ok. If the quench zone ends up below .035, then there are
plenty of .050 thick head gaskets on the market. One more benefit to this is
that most machine shops charge much more to deck a block down from stock deck
height to 9.780 than they would to do a light cleanup, and that's all that's
needed when using our Wiseco pistons.
Another good feature about our
pistons having a taller compression height is that the ring land above the top
ring is much stronger by being .010 thicker. When pistons encounter the
effects of detonation, it is not uncommon to see pistons with the ring land
above the top ring broken off. The thicker ring land also makes a better heat
may have noticed that our Wiseco custom made forged pistons are referred to as
Racing Pistons on the package. This does not mean that the pistons are for
racing only. This is a generic term, referring to their ability to be used in
high performance applications as well as for street rod use. These pistons are
perfectly designed for use on the street, as well as for medium to upper level
custom made Wiseco forged pistons are made from 2618 aircraft alloy. We find
this alloy to be much more suitable for high performance engines than the
common 4032 forged alloy. You will usually see the higher end pistons on the
market using 2618 aircraft alloy.
go with 2618 forged pistons? If you encounter certain tuning issues, detonation
is highly probable, and its effects can cause severe damage to your engine. The
2618 forged piston is able to withstand the damaging effects from detonation to
a higher degree than the lower cost 4032 forged pistons, especially non-forged
hypereutectic pistons such as Speed Pro or Keith Black, and many others.
Wiseco forged pistons will clear most any valve size on the market with ease
even with the use of large lift cams.
have built approximately 3500 engines using the Wiseco pistons. The engines
have been for street rod and strip use. We have seen no problems, nor have
there been any complaints. They are an excellent product in every respect.