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Old 01-18-2016, 12:50 PM
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TCSGTO TCSGTO is offline
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Join Date: Dec 2000
Location: Warren,Ohio,USA
Posts: 1,686
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Quote:
Originally Posted by Formula8 View Post
I don't think there is a lot of experience with solid street rollers and certainly no guarantee that a lot more power would be made. At least not a lot that I could find. However, many have run the OF/Hybrid and the results are well known relative to HP,TQ, 1/4 mile times, RPM range, vacuum and idle quality. Not to mention we know what lifters, springs etc that work with this combination. I don't have a need to be a "pioneer" with a $1000 investment that I really didn't want to make in the first place.
I agree. If a solid cam is larger it will make more power than the HR but you'll have to pile on more spring and more lash so longevity is compromised. A similar sized SR will make similar power but need more monitoring/maintenance.
The Comp Magnum HR lobes have been proven over & over to turn at least 6K RPM with the dreaded Crane 99893 spring with SR lifters. One could run a 160/450 spring for that warm & fuzzy feeling but why run 200/600 and have to replace/rebuild lifters regularly unless you like that sort of thing?

__________________
68 GTO,3860#
Stock Original 400/M-20 Muncie,3.55’s
13.86 @ 100
Old combo:
462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's.
1968 Pontiac GTO : 11.114 @ 120.130 MPH

New combo:
517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's
636HP/654TQ
1.452 10.603 @ 125.09
http://www.dragtimes.com/Pontiac-GTO...lip-31594.html