TBIThrottle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.
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Did a search and couldn't find any useful information, but I was wondering what rockers i should order from Summit for price and reliability, and should i order anything else with it?
But that aside is there any tuning changes i should make, i have my current tune for my full exhaust and a few mods, but will it change the VE?
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1992 RS Heritage Edition /350 OE Roller Bored .060 over/Holley 650/Edelbrock Performer RPM/Vortec Shaved Heads 10.5:1 Compression/Beehive springs/Comp Magnum 1.52 Rockers/Speed Pro Flat Top Pistons/Comp XR 270 .502 lift
'10 best 13.1 at 106! Needs some minor tuning for 12s
Standard stamped steel or steel RR from comp-cams or similar would work. Nothing aluminum. I doubt youll see a huge change in your VE. Probably just a relatively minor increase in certain areas. 1.6 ratio rockers are more of an incremental change then anything else.
if your going to spend 200 bucks on roller rockers just get comp cams pro magnum rockers. jegs has them for about 280. full roller design, stronger then aluminum. and you could expect a 10-15 hp increase over a stamped steel stock rocker.
__________________ 1989 RS L03 305/700R/Auburn pro series posi w/3.42 gears.
Work in progress. edelbrock 600cfm carb on top of weiand stealth manifold, Edelbrock Shorty headers, 3 inch Flowmaster American thunder system w/ no cat.
emissions deleted, A/C deleted. K&N open element.
Soon to come: New 383 stroker est. 500 hp, moser 12 bolt, BTO level 3 700r4.
I would go with a set of stamped 1.6 summit brand rockers for 87' and later heads. You won't any noticable difference compaired to true roller set-up. Not worth the extra $150 when $50 can net you a solid hp gain. The stock cam can take all the help it can get and 1.6 rockers are a pretty good mod. I would only consider them if I didn't already have headers or at least a cat-back. Your $50 is better off in a savings jar until you can afford the rest.
summit dosnt carry a stamped Self-Aligningrocker other then 1.5 stockers
from gm proformance parts
the summit ones are not Self-Aligning and would need screw in studs negateing the cost saveings of useing the stamped vs something roller
also why are alloy ones not recommeded they came stock on lt-4 engines apperently gm feels there ok for use on production engines
Last edited by Azrael91966669; 05-17-2008 at 05:49 PM.
I bought these for my 90 RS a few years back (were alittle cheaper then) and I picked up .15s in the quarter mile.
They are 87+ self realigning stamped rockers and even though the description says otherwise they do come with the pivot ball and nut.