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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 09-15-2005, 11:01 PM   #1
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I may be getting 4 days off at the end of this month. That means rockers so I can install that 3.3" I won at MAG. I just want to know which ones have seemed to offer the best gains. Is it o.k. to have rockers with stock exaust? The combo i'd be running is, PCM, 1:9 rockers, gutted box, and NGK TR55'* gapped @ .54. Also, would I need to get LS6 springs and OR pushrods? I'm not going to set the PCM to shift at 6200rpm, just 6000. So would I still get valve float without the springs and push rods even if I don't rev above 6K?
1997 Olds LSS Supercharged. 262hp and 340ftlbs. 1/4- 15.1@ 92.04mph (stock), 2.38 60ft. Nope, I can't drive. 125,000 miles. White. Interior equipment; dual 8 way Aurora leather power seats w/ lumbar, two tone interior, theater dimming lights, CD and Cassette w/ Concert Sound III (nice), steering wheel controls, sun/ moonroof, ect. Mods: 3.5", high flow cat, 1:9s, and gutted air box w/K&N filter.

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Old 09-15-2005, 11:40 PM   #2
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Its perfectly fine to run 1.9 rockers with stock exhaust. We have rockers on the SSEi and the Monte and they both have stock exhaust (the SSEi has a removed cat, but its stock otherwise) and both run great. Obviously exhaust work would help it gain more power, but its not required for rockers. Stronger springs are recommended with rockers because the stock springs are weak, but some people have no problem at all, others have huge valve float problems. Pushrods shouldn't be required at all though. We have stock springs in the SSEi and Monte and neither of those get valve float, but the 6k shifts in the SSEi and 5800rpm shifts in the Monte might have something to do with that. You will probably be fine with stock springs, but I can't garuntee anything. My recommendation would be to install the rockers and see how it works out. If it gets float, buy some springs.

Thats my $.02.

1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
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Old 09-15-2005, 11:46 PM   #3
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I'd hold out on the Harland Sharp rockers till they get the pedistal angle right. (I think that'* what the problem was?)
1.9'* would seem the best way to go though.
Right now I'm running light weight pushrods, LS6 springs, comp retainers, and I'm shifting at 64xx. So, I'd guess LS6 springs + Comp retainers would work just fine for you.
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