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Author Topic:   Fitting Vortec heads for high-lift springs
posted January 28, 2004 04:33 PM
I've got a set of vortec heads that are going to be going on a budget 355 to replace some old 882's. The cam that is in the 355 is .540 lift, and was wondering how much everyone is paying to get the heads cut for the higher lift spring - or is this something that can be done "at home" with a special tool??

Also - thought about fitting .100 longer undercut SS valves - will they help with the lift problem? What kind of flow difference in the valves can I expect over the stock valves?

posted January 28, 2004 07:19 PM
It isn't so much the spring size, but the guide boss that needs cut-down. Yes, it's something you can do at home with a special tool that runs in a 1/2" hand drill. You can get the cutter and guide at Goodson ( Look for the tool that cuts for Teflon seals.

posted January 30, 2004 05:25 PM

Having the springs done is only $30-$40 from a good machine shop. I'd pay to have the work done. My shop installed the springs and cut the boss down for $30. You can use the vortec retainers so don't buy new if yours are fine.

Also, In my opinion 540 is a ton of lift for vortec's. I've had our best results with a 509 lift cam. The further away from 500 you get the less the vortec's seem to like it.

Never tried undercut valves, so I couldn't tell ya.

hope this helps you.

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