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These aftermarket
main caps will strengthen not
only factory 2 bolt blocks,
but also 4 bolts. Unlike the
factory main caps, these not
only have more cross
sectional strength, but the
real strength secret is in
the angled side bolts!
The side
bolts are angled so they pull
from the side walls of the
block and not the flimsy main
web area. A bolt that is
angled will require a massive
amount of additional load to
flex or stretch, let alone
break, compared to a
conventional straight up
bolt. The side bolts heavily
load the main cap against the
register step which stops
"cap walk". It is main cap
walk that causes a great
amount of unforeseen bearing
damage and horsepower loss.
Milodon main caps are
precision machined from high
strength ductile material
which has the proper balance
of strength yet is not too
rigid like a billet main cap
to allow transfer of
increased shock loads to the
crank and bearings. In this
case, more is not better when
it comes to hardness.
Only .030"
of material removal is
required upon initial
installation, which will
allow 100% clean up on a
damaged block. The drill
bushing used to drill and tap
the side bolt holes is
included in the kit. The side
bolts can be installed by
anyone with a hand drill and
a tap. If the block has
square main registers, the
block needs only a standard
align bore to finish the job.
Milling the mains is only
necessary if the main cap
registers are not square.
All
necessary bolts, washers and
the drill bushing are
included in the centre three
main cap kit. For maximum
strength the installation of
Milodon main studs are highly
recommended.