Bill,
Take a look in Crane's catalog. Crane actually makes them for MP. They have
a different spring they recommend when lift exceeds .500. P/N on the Crane
Springs is 99838. This spring is a dual spring seat pressure 110 lbs., open
330. With this spring valve float should occur around 6,500. I have a hunch
that the MP catalog is incorrect. Either way, Crane recommends and prefers
that you run the above one.....
Frank
> -----Original Message-----
> From: WillTier@aol.com [SMTP:WillTier@aol.com]
> Sent: Tuesday, September 07, 1999 7:14 PM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: Turbo vs Supercharger; Attn. Patrick.
>
> In a message dated 9/5/99 6:51:07 PM Eastern Daylight Time,
> Frank.T.Holloway@KP.ORG writes:
>
> << Your spring problem has to do with the lift of the cam your running, RT
> springs are not recommended when you push the lift over .500 inch. >>
>
> Frank
>
> The Mopar Perfomance Parts Catalog states the springs are good for up to
> .525
> lift cams ?? I am running these P5249464 springs with a similar cam to
> Patrick's but a .484 / .512 lift but have very few miles on them. These
> are
> the same springs they are running in the 360 crate engines with a .501 /
> .513
> camshaft ?? Could the ramp on the comp cam be different enough to cause
> the
> problem ? And Patrick which springs are you breaking the intake or exhaust
> or
> both ? And how many RPM are you running up to ?
>
> Bill
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