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.