Hey guys. I am going to upgrade to 1.6 roller rockers. I wasn't even thinking about the ECM. Would bigger rockers confuse it? Will I need a chip? Thanks.

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91 Z28 1LE 5.7 automatic
SLP headers, random technology cats, borla muffler, Accel 8.8 wires, Hotchkis STB

boycott Sam Pierce Chevrolet

 

I have a 91 Z (happens to be a 1LE as well)I put 1.6's on mine plus I had a cam put in too and it ran fine.You could diffentlly benifit from a new custom chip but you shouldn't have any problem


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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

Hmm, I'm going to try my 24lb injectors and 1.6 rockers with no chip. I'm not brave enough to try a cam yet though. It is my everyday driver.

Also is this a good tool to use?
#778-66783
www.jegs.com

 

FWIW if you put those 24# lb injectors in you find yoor gonna be running rich unless you get some chip programming done.Domn't know if you have ever visited the DIY PROM
board.But there is a lot of info on there about these kinds of modes.I just started doing my own chips a few weeks ago.After I installed my new setup.see sig below.Now would be the time to learn when your are only adding 1 or 2 things at a time.don't do like I did and change everything at once and try to learn. but anyway there is a simple adjustment in the prom to accomadate the larger injectors.But you will most likely be running rich.

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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

Chief is right about those injectors! Do the RRs' first, along with some other air flow stuff before you even worry about those 24# injectors!!

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Hugger Orange '91 L98 Z

 

Thanks guys. I thought it would run too rich, but in another thread some people said to try it and see how it runs, also that it should be okay. I don't know if they realized I have speed density though. I thought upgraing the rockers would have a bigger effect on the ECM. I have read traxion's intro and will probably read it a few more times before I attempt any prom burning. Anybody use that rocker stud removing tool I posted above?

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91 Z28 1LE 5.7 automatic
SLP headers, random technology cats, borla muffler, Accel 8.8 wires, Hotchkis STB

boycott Sam Pierce Chevrolet

 

There shouldn't be any reason for a stud removal tool.If you go with the correct rockers like I said they are a direct replacement.



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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,

 

No stud removal? They are Crane stamped 1.6 rollers, and are not self-aligning. From everything I've read, I need heat-treated pushrods and guideplates along with srew in studs.

 

I too was under the same impression at first.In fact I even got a set of non-self aling 1st.Only to return them and get the self alining.I got the Crane Gold racing not sure of the ones your talking about.but yes a nonself alining one would require what you mentioned plus getting the heads machined for the screw in studs all of this $$$.What is the price on the ones you are refering to.the Gold racing self aling (P/N 270-10758-16) are $300 bucks, but 30min or so and they are on.No guide plate,no hardened pushrods,no machining nothing off with the old on with the new.Those stamped one maybe less $$ but alot of work.Some one stop me if I'm wrong please.

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1991 1LE Z28 355cu 5SPD (ORIGINALLY 305 BEST E.T. 14.186@99.86mph)NO PASSES ON 355 YET.MINI RAM INTAKE,AFR 190 HEADS,10.23:1cr 24# SVO INJECTORS,BBK 52mmTB,AFPR
FULL ROLLER MOTOR,1.6 rockers MSD 6AL
AUTOMETER A/F GAGUE MARCH PULLEYS,HEDDMEN HEADERS 3IN EXH NO CATS FLOWMASTER,POWER TRAX NO-SLIP LOCKER,3:42 GEARS,LAKEWOOD LOWER CONTROL ARMS HOTCHIKS STRUTTOWER BRACE,COMPETTION ENG.SUBFRAME CONNECTORS
MALLORY TACH W/SHIFT LITE
BLACK, TINTED WINDOWS, TAIL LIGHT COVERS BIG BLOCK COWL INDUCTION HOOD,SHAVED DOOR HANDLES

67RS 327cu 92K ORIG MILES.NEWER GM HEADS HEADERS,650 HOLLEY CARB,CAM, 350 TURBO TRANS W/SHIFT KIT&COOLER 12 BOLT POSI 3.73'S MUTLILEAF SPRINGS
NEW VINYLROOF&CARPET, COWL HOOD,HIDE AWAY HEAD LITES,