I have Stage 2 crow cam and high ratio roller rockers ready to go into my ecotec with twin throtts and a full 2.5" exhaust I was just wandering will that cam suit the roller rockers? The roller rockers were from you company but they are 2nd hand along w

If the part number of the CROW Cam you have is 8531562 and are intending on running our 1.9:1 ratio rockers, then it won't be an issue however you'll need to run the following items.

130lb Crow Cams Valve Springs.

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/SPG601/SubProducts/SPG601

Premium Viton Valve Stem Seals

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/SPG605

Manley Performance Valve Spring Retainers

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/SPG604

COMP Valve Locks

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/SPG603

Rollmaster double-row timing chain set

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/RLM601

If you have a set of our 1.98:1 ratio rockers, then you won't be able to use them with the previously quoted cam without machining the valve guides down and running even stiffer springs due to the created valve lift. If you have one of the CROW Cam higher rocker specific camshafts, as shown in the link below, then it won't be an issue with running either rocker rocker.

CROW CAMS TO SUIT V6S WITH HIGHER RATIO ROCKERS

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/CAM607/SubProducts/CAM607