SWAN
RACING IS THE EXCLUSIVE SALES AGENT FOR C.O.M.E. RACING
3800 PRODUCTS IN NORTH
AMERICA.
Holden V6 4.2
Stroker kit instructions:
1)Rod bolt tension
for “I” beam rods both VN-VR and Ecotec should not exceed 30
ft.lbs (40 NM) and ideally should be torqued in 3 stages with
moly disulphide based grease or engine oil on
threads.
2)Rod bolt tension
for “H” beam rods a maximum of 35 ft.lbs (47 NM) with moly
grease on threads. Tensioned as the “I” beam in at least 3
stages.
3)Main bearing
tensions as per factory specs for the 3.8 litre
engine.
4)When mock
assembling either the Ecotec or earlier VN-VR engine you will
need to clearance grind small notches in the bottom of
cylinder bores for rod clearance. They do not actually
physically touch there but they are very close so we recommend
a small eye brow notch to ensure there is some
clearance.
5)Ecotec engines
will also need clearancing at several locations near the oil
pan rails for crank/rod clearance. The VN-VR engine also
requires this but to a lesser degree. The amount of
clearancing is only minimal even for the Ecotec. Considering
production castings do vary, checking all blocks is
imperative, with clearance grinding using a porting tool or
die grinder important. The clearance needed is no more than
.040”-.060” (1mm-1.5mm) for rotating and reciprocating
components.
6)Clearance must
be checked between con rods and CAMSHAFT lobes carefully. It
is recommended cams be ground with approximately .030”-.040”
(.75mm-1mm) smaller base circle diameter to ensure clearance
from con rod interference. This amount will vary with the
exact cam specifications but when ordering a cam for use with
VN-VR and Ecotec strokers this must be passed on to your cam
supplier. COME Racing stocks a full range of billet cams for
the Holden V6’s with correct base circle sizing for all our
stroker combinations.
