Using an aluminum block inline six for
performance driving? Save thousands now and prepare your
Just look around our web store; we are the #1 source for race
grade fasteners for BMW in bolt / stud sales and stocking
capacity. More than that, we are the BMW engine experts racers
all over the world trust!
In 1998, we purchased a 1999 E46 and began to race with it almost
immediately. We applied our previous decades of engine building
experience to fix the inherent issue of hardware and block failure
that plague the aluminum engines early on, with hundreds of hours
of hard use on our engines.
So what happens to these aluminum inline six engines?
Under stress, the OE head bolts can stretch and fail, just like
most BMW motors... but specific to the aluminum inline six blocks,
once the hardware is replaced with upgraded hardware it can rip
from the 'softer' aluminum block.
This also happens with OE hardware, when these engines over heat
(from a blow head gasket or otherwise).
To avoid this cycle of failure, there is now a convenient kit that
can be used be used: While these kits are typically used to fix
engines that have overheated, we offer them to "prep and repair"
your engine for high performance use so you are worry free and
don't experience blown gaskets, catastrophic head warpage, or torn
head-bolt holes in blocks.
Q: ARP, Raceware, Stretch Hardware?... what's all this
A: First, all OE BMW Head stud hardware is stretch type, meaning
that once used; it should be discarded as it is no longer capable
of securing the head properly.
ARP does-not make aluminum block head stud kits, but Raceware does.
They offers improved strength over the standard head stud material
making them ideal for forced induction and racing use... However,
this improved strength can cause the block to fail as these strong
studs rip from the 'softer aluminum' (vs. a typical iron block).
Time-serts give the studs a greater effective area to "grip" the
block and less localized stresses on the small OE stud holes.
**Inquire about our in house block time-serting service if you
are unable to source a machine shop to build your motor.**
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