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#11
05-10-2014, 11:27 AM
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Stronger outer spring, but then supplemented with an inner spring to bring the net pressures up more than just the single spring. And looking at the specifications, it sure didn't look like, at least in '69, the dual springs net had much more pressure than the single. I'm thinking like 10#'s more. I cannot remember the numbers right now, but something like 90# versus 100#, and that was a maybe.
I want a stiffer spring, though admittedly not sure how much stiffer. I've revved it up, in first gear, to 5,800rpm, a couple times and that's where the engine refuses to go any higher. About 5,300rpm the rate of engine acceleration starts noticeably dropping off, so that is either valve springs, C-cam (1bbl) going past peak HP point, or port choke. I think it's valve springs.
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__________________________________________ "How I learned to stop worrying and love the OHC Pontiac L6"  The Silver Buick- '77 Skylark coupe w/455, SPX, MegaSquirt 3 & TKO-600 (Drag Week 2011, 2012 & 2015!) 1969 Firebird with a turbo'd Pontiac L6 controlled by a MegaSquirt 3 and backed with a microsquirt controlled 4L60e and 4.56 gears! (Drag Week 2018!) |
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