RE: RE: questions on roller rockers

From: Holloway,Frank T (Frank.T.Holloway@KP.ORG)
Date: Mon Oct 25 1999 - 10:36:06 EDT


Mike,

A couple of suggestions on roller rockers for ya. The MP roller rockers are
actually manufactured by Crane. Whether you buy from MP or Crane really
doesn't matter. These rockers are actually SB Chevy 1.6 rockers. Because of
this, they take a special pushrod. The pushrod they sell is actually a SB
Ford pushrod and has a Tip to Tip length of 6.812, the factory Magnum
pushrod has a Tip to Tip length of 6.900. Do not try to use the factory
pushrods and use the pushrods supplied with the kit. The only company that I
know that actually makes rockers specifically for the Magnums (not a rocker
for a different type of engine) is Crower. My suggestion would be to always
opt. for the higher ratio (1.7/1) unless your cam mandates less lift. The
higher ratio translates into higher lift at the valve and the and the
engines with factory cams benefit from this. If during installation, you
find that the tip of the rocker doesn't ride pretty much centered on top of
the valve, Crower does sell both longer and shorter pushrods. Your factory
springs are more than sufficient with the factory cam and shouldn't cause
any problems with the 1.6 or 1.7 rockers and are more than sufficient up to
5,500.......

        Frank

> -----Original Message-----
> From: Wisotzkey, Rich [SMTP:Rich.Wisotzkey@gd-wts.com]
> Sent: Monday, October 25, 1999 6:41 AM
> To: 'dakota-truck@buffnet.net'
> Subject: DML: RE: questions on roller rockers
>
> Mike,
> There are a number of good rocker setups to pick from. I am going with
> 1.6:1 Mopar rocker setup just like Bob Tom did. I'm using these in
> conjuction with a Hughes cam and set of heavy springs. The DAK is down
> right now due to not being able to get the JBA Y-pipe to fit. It won't
> clear the transmission or the right suspension arm mount. Once this is
> corrected, the rockers and cam are going in. Will let you know how it
> turns
> out. (I still owe you a picture anyway. :'B)
> Rich
>
> -----Original Message-----
> From: Michael Clark [mailto:magnumv8@wt.net]
> Sent: Saturday, October 23, 1999 5:54 AM
> To: dakota-truck@buffnet.net
> Subject: DML: questions on roller rockers
>
>
> Now that my dak is pulling harder and higher in the upper rpm band (I'm
> shifting at 5200 - 5500) I'm starting to worry about the valvetrain. I'm
> thinking I should upgrade to some good roller rockers, maybe stiffer
> springs
> and some hardened push rods. But I don't really know where to start.
> When
> you do roller rockers do you change anything else (springs or rods)? I
> want
> to make things as safe and reliable as possible for higher revs. So what
> should I do?
>
> Thanks,
> ---Mike, near Houston.--- http://www.mikesdakota.com
> '93 V8 4X2
> Houston Area DML Meet Page
> http://www.geocities.com/motorcity/downs/9221



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