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Old 07-30-2005, 07:02 PM
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69SSZL1 69SSZL1 is offline
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Default ZL-1, MSD

My ZL-1 engine "loads up" when idling or driving in traffic (cruise night only). Would an MSD unit (I would use the GM version 10037378 if compatable with TI ignition) help this problem? Engine is all ZL-1 including cam, carb. Thanks.
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1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 Anti-Spin differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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Old 07-30-2005, 09:36 PM
Chevy454 Chevy454 is offline
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Default Re: ZL-1, MSD

No...what plugs you running? Also, how is your carb set up?? Your powervalves in good shape???
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Old 07-30-2005, 09:59 PM
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Default Re: ZL-1, MSD

Plugs are stock AC-R43XL, carb is stock Holley 4296 set up, power valves are good, cam is stock ZL-1 with 260/270 @ .050 duration.
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1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 Anti-Spin differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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Old 07-30-2005, 11:16 PM
Chevy454 Chevy454 is offline
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Default Re: ZL-1, MSD

My first suggestion would be to ditch the AC plugs and try a set of NGK v-power plugs...if they don't clean up your idle, then you can definitely look elsewhere.
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Old 07-30-2005, 11:43 PM
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Default Re: ZL-1, MSD

Thanks, those are great plugs.
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1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 Anti-Spin differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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Old 07-31-2005, 02:17 AM
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Default Re: ZL-1, MSD

Rob what are the NGK plug numbers for an L-72?
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Old 07-31-2005, 05:44 PM
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Default Re: ZL-1, MSD

In our 840 heads we run the R5671A-7, and I believe we run the UR5 in our 291 heads...
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