Hi
John,
Most
manufacturers of roller (full and/or tip) claim as much as a 40 hp increase due
to more accurate rocker ratios. According to the manufacturers, stock
stamped rocker ratios vary from 1.4 to 1.5 when the spec calls for 1.52
(standard small block Chevy). If the rocker ratio isn't what it's supposed
to be, the valve won't realize full lift from the cam.
For
example, if your lobe lift is .361" and the rocker ratio is supposed to 1.7,
valve lift should be .613". If your rockers aren't a true 1.7 ratio,
but more like 1.6 your valve lift would only be .577". Less lift means
less power. You also lose a bit of duration with less rocker
ratio.
You
mention the other benefit below about less valve guide wear. So, all
things considered, getting more hp and less wear on your engine is a good thing
and worth the extra money in my opinion.
Herb Lumpp
http://users.adelphia.net/~hlump/index.htm
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of John W. Lonadier, Jr.
Sent: Friday, February 03, 2006 4:28 PM
To: Chevelle Net
Subject: [Chevelle-list] Roller tip versus regular rockersI would like to some feed back on how a some of you on the list feel about roller tipped rockers versus the regular type. I'm getting ready to put the "new" heads on my car and a co-worker suggested I use the roller tip type. His justification was this, "with the roller tip rockers the valve will not be getting pushed down in a side motion where as the roller tips allow the valve to be pushed straight up and down not prematurely wearing out the valve guides". I was not thinking of this as in increase in horse power, just looking to have the heads on there for a while without having to pull them off and have the guides replaced again because all that was done when the heads were machined.Thanks in advance.John L.
ACES #5597
70 LS5 TRIBUTE
http://chevellfan.com/index89.html
http://www.larueclassics.com/gallery/gallery%20pages/lodanier-chv70.html
