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#1
10-14-2006, 03:36 AM
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Re: Distributor setups for L78 or L72 engines?
The vacuum reading is around 14-15 at idle. It's definitely a low idle but the car has no problem at this idle speed. If I advance the timing a little I will get some pinging. If I turn up the carb idle speed it tends to get hung up a little so I like it where it's at right now. The carb is a tweaked Holley 750 that I don't really like with the modifications to it so I'm trying to get an original 4557 rebuilt. The engine has some 71 oval port heads so the compression is probably lower than a stock L78.
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69 Z28 JL8, #'s match - being restored 
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#2
10-14-2006, 04:20 AM
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Re: Distributor setups for L78 or L72 engines?
14-15" of vacuum for an L78 cam motor is good...maybe the lower compression of the oval ports helps. I only get 11-12" on any of the original cars. Eric (vintage musclecar) is a good source for a rebuild of that 4557.What intake you running on those oval port heads?? Does the motor ahve the L78 cam??
wilma
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02 Berger 380hp #95 Lots of L78 Novas Join National Nostalgic Nova! 70 Orange Cooler 69 Camaro
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