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I have a '69 Z/28 that has a 302 with a 750 holley carb.It is flooding out and not running good at all.Is the carb too much for the engine?Can I change the jets or do I need to change the carb?What came stock on the 302 in '69?
Thank you
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Stock it had a 780 cfm vac secondary so they could win races at 7000 RPM. There is something wrong with your float/needle and seat. Try adjustment first then a teardown of the carb might be in order. Carb might be a bit big for good street drivabillity but not the source of this problem.
-Mark.
 

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I'm not trying to be a Di_khead goat, but I hope NOBODY ever puts an edelbrock carb on a Z-28.

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Black 69 camaro
 

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if i had one, i would put a Q-jet on it... from a mid 80's 305, and hook up all the feedback stuff... or, maybe a rochester 2 barrel would work better- not the decent ones, but the "half a Q-jet". that would kick butt on an otherwise original Z28...
of course, i am kidding. but it would be MY car to do as I wish with...

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik
 

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Some DZs also came with 2- 4 bbl carbs (JL-8)
so a 750 holley would highly unlikely be too much. I have had the same problem with my 750. Usually, I change my blow out valve and presto, good as new. Also, what is your air fuel set at? check for cracks in the metering block and as said before, set your floats low. Good luck Tarheel!!
 

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i don't think the JL8 cars necessarily had the cross ram intake setup. i believe that was a totally seperate option, available on any Z28, or even dealer installed, sold over the counter. JL8 was the 4 wheel corvette brakes, and available on any camaro, from what i have read here. any 6 cylinder, 3 speed manual JL8 cars out there? that would be a neat find.

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik
 

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NovaDerrik, Thanks, you are right, dont know what I was thinking! Still the X-Ram is a lot of fuel! if a DZ could handle something like that it seems like it would be pretty hard to flood one out with a 4150.
Thanks!
 

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Cross-rams were over-the-counter dealer parts only - never installed in production. Your 750 should work fine, probably just needs a good cleaning and a rebuild kit, and the floats set properly (don't buy anything but the correct Holley kit - the parts store "generic" kits are junk). The original 4053 carb was a 780, way too big for the street, but they had to build production Z's with them so they were SCCA-legal for Trans-Am racing. Truth be told, 302's run much better on the street with a 600; better metering and booster signal due to higher venturi air velocity, better driveability and throttle response. Jeg's sells a 600 Holley #0-80145 for $260 that's physically and visually identical to the original 780 (4150, dual-feed, center-hung floats, vacuum secondaries) except it has an electric choke. Had one on my Z for a while when Jerry MacNeish was rebuilding my 4053, worked great, straight bolt-on including the stock fuel lines, jetting was fine right out of the box.

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JohnZ
CRG
'69 Z28 Fathom Green
 
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