[DeTomaso] Rebuilding BOSS heads to hydraulic lifters

JDeRyke at aol.com JDeRyke at aol.com
Sun Mar 1 12:50:06 EST 2009


In a message dated 3/1/09 9:24:20 AM, detomaso at luleweb.se writes:

> Is it possible to rebuilding “BOSS” adjustable rockers/studs heads to use 
> hydraulic lifters and rockers?
> 
Yes on the lifters; no on stock rockers. My SVO/NASCAR heads run hydraulic 
lifters without problems. All you need to do is 'center' the lifter plunger in 
the body- spin the pushrod betweeen thumb & forefinger while tightening the 
adjusting nut, until some drag is felt. Then add 1.0 turns of the nut (factory 
setting) or 1/4-turn ('performance' setting) and lock the nut. The last method 
will give maybe 200 more rpms before hydraulic lifters pump up. But unless you 
have converted the rockers to use an adjustable locking nut, there will be 
nothing to adjust. Roller rockers are worth the cost due to less sliding friction 
on the valve stems & guides, which lowers oil temperatures. Good luck- J 
DeRyke


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