I have done this to my racing car and could tell no seat-of-the-pants
difference. I would not consider it for the street.
Richard Crump
----- Original Message -----
From: Chris and Jodi Barnhart <barnhart@geneseo.net>
To: <mgs@autox.team.net>
Sent: Monday, March 13, 2000 8:47 PM
Subject: Thinning Throttle Spindles
> Listers
>
> Anyone have any thoughts on when it's necessary to thin the throttle
> spindles in HS4's to improve flow? I've done the exhaust and intake
> valve mods from Burgess's book and plan on increasing the compression
> ratio to 9.5:1. No cam changes. The current "poppet" style butterflies
> will be replaced by the plain butterflies, which should help some
> (Thanks, Ed). Burgess doesn't really say at what point the throttle
> spindle mods to the SU's become necessary. I'm guessing at higher RPMs
> than I'll typically run on the street.
>
>
> Chris
> '69B
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