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Robert G Mar 2nd, 04, 12:53 PM I was taking a vac. reading at the carb base and as the motor idles i get a reading that is 5 jumps up 7 .it bunces between 5-7 Hg, but when i give it gas it will read stedy at any rpm is this mornal, i do have a larger cam than stock .558 lift @.050 :D ss3964spd Mar 2nd, 04, 2:37 PM What are the rest of the spec's on the cam? Dan Robert G Mar 2nd, 04, 5:04 PM i wll post them ASAP smile.gif Robert G Mar 3rd, 04, 11:14 AM I have a LUNATI 00026 THE SPEC ARE DURATION @ .050 232/239 deg lift .549/.558 lobe separation .110 if you need more info. please ask i have the cam card JRS70LS5 Mar 5th, 04, 12:32 PM Robert if 7" of vacuum is what your reading on a 454 with that cam I would say you have a bad vacuum leak somewhere,that would also acount for the lean misfire on cold startup to.I have a 461 with 10.7 comp.and 255/263@50 612/630 cam and have 8" of vacuum.Your vacuum reading should be higher with that cam.There are several things that can effect vacuum,leak,timing,low comp,would be what I looked at first! graemlins/waving.gif JOEL_TX Mar 5th, 04, 1:23 PM Timing is set at??..... Robert G Mar 5th, 04, 4:46 PM OK i started with 16 degs , then i set my timming light to 28 rev. to 2000 rpms turned the distr. till the line was on 0 deg. all this was done with the hei vac line off. THIS IS HOW I WAS TOLD TO SET IT now if its the right WAY i don't know. feel free to add any info. I NEED TO FIND MORE INFO. ON SETTING TIMMING :confused: JOEL_TX Mar 5th, 04, 5:38 PM Yes, do a search in the engine or performance section for timing procedures....I don't know what motor you have, but most Chevy's run 35-38 total..... | ||