Cylinder Heads, head modifications & components
 
Coscast cylinder head
Coscast Head, please click here for how to identify a Coscast Head
 
Cylinder Heads 2.0L
Part No Description
HEAD-M5 Sprint/Race pro spec head 2.0L
HEAD-M6 Astra kit car head 2.0L XE 16V
HEAD-M-VX2.0-01-BV-CNC 2.0L Race head with CNC Port work
Cylinder Heads 1.6L
Part No Description
HEAD-M5-1.6 Sprint/Race pro spec head 1.6L
HEAD-M5-1.6SP Pro spec head 1.6L 16V + port mod

The 1600cc cylinder heads with the triangular ports are found on the X16XEL engine from the Astra/Zafira from 1998 to now.
 
Head Modifications
Part No. Description
HEAD-1.6-1.6V-W Weld exhaust ports on 1.6L 16V
HEAD-CLC-1 Mod Cam area for lobe clearance 2.0L
HEAD-CLC-1-1.6 Mod Cam area for lobe clearance 1.6L
HEAD-M-COOLING Head cool mods spec 1 + block
HEAD-M-DBR1 Deburr cylinder head
HEAD-SRT-1 Remove dizzy mount and plug 16V
  Group N Modifications
HD-M-GRN16V Head mod Group N+ 16V 2.0L
HEAD-M-GRN XE/Ecotec Group N head work
HEAD-M-GRN-PLUS Group N+ Ecotec/XE
 
Head Components
Head parts
Head Bolts
Part No. Description
BLT-H1 Head bolt 2.0L 16v pre 93
BLT-H1-STUD Head stud 2.0L 16v XE pre 93
BLT-H1-STUD-KIT ARP Head Stud Kit 2.0L 16v pre 93
BLT-H2 Head bolt 2.0L 16v 93on
BLT-H3 Head bolt 1.6L 16v Corsa engine
BLT-H3-STUD Head stud 1.6L 16v engine
BLT-H3-STUD-KIT Head stud kit 1.6 16V engine

Head stud kit

Instructions for BLT-H1-STUD-KIT

Instructions for BLT-H3-STUD-KIT
Main Cap Bolts
Part No Descriptions
BLT-MK1 Heavy Duty Main Cap bolt Set - Early 2.0L
BLT-MK2 Heavy Duty Main Cap bolt Set - Late LN & ECOTEC 2.0L
BLT-MK3 Heavy Duty Main Cap bolt Set - 1.6/1.4L 16V
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