



 



























 |
|


Main Cap Support Girdles
Strengthen the bottom end of high powered Ford 6
cylinder SOHC and DOHC engines by adding an
Atomic main cap girdle. Precision laser cut from
billet steel and precision CNC machined, our
main cap girdles are designed to tie all 7 main
caps together to increase structural integrity
of the block and main bearing caps.
Main cap girdles are a vital component in
engines producing over 400kW at the tyres, as
the main caps begin to “walk” on the block at
this power level and beyond. Once this occurs,
the main bearing caps no longer provide accurate
bearing alignment for the crankshaft, leading to
premature crankshaft and or main bearing
failure.
One major feature of our girdles is that they
fit! No need to notch and weld the sump to make
it fit and with at least 4mm clearance to the
conrods, no conrod bolt clearance issues will
occur. The girdles also fit with fit with std or
aftermarket fasteners and due to our
counterbored bolt holes, retain sufficient main
cap bolt purchase into the block.
We have seen some cheap copies of our girdles
that are not contour-milled for conrod clearance
or counter-bored, so either the conrod hits the
side of the girdle or the bolts do not go all
the way into the block. You will not encounter
fitment problems with a genuine Atomic main cap
girdle.
Available in two models, for Street/strip use
(up to 698kW) or for Race applications, all DOHC
girdles come with a louvered OE style windage
tray. Installation is by way of the original
bolts or with an Atomic #306670 or
#306671 Main stud kit.

#306250 - Atomic main cap girdle
16mm thick suit BA-BF Ford 6 cyl Race
applications - minor sump modifications may be
required
#306251 - Atomic main cap girdle
10mm thick suit BA-BF Ford 6 cyl Street
application - will fit standard sump without
modifications
#306252 - Atomic main cap girdle
16mm thick suit EF-AU Ford 6 cyl Race
application - minor sump modifications may be
required
#306253 - Atomic main cap girdle
10mm thick suit EF-AU Ford 6 cyl Street
application - will fit standard sump without
modifications
#306254 - Atomic main cap girdle
10mm thick suit FG-on Ford 6 cyl Street
application - will fit standard sump without
modifications
#306255 - Atomic main cap girdle
16mm thick suit FG-on Ford 6 cyl Race
application - minor sump modifications may be
required
|