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#2
01-03-2005, 10:06 AM
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Re: Making the change: 2BBL to 4BBL
I disagree with y'all.
Everyone swaps 2bbl to 4bbl, but I doubt you'll see any performance gain. That 2bbl is more than keeping up with the engine. I'd suggest rebuilding the distributor (vertical lash and advance tweaking) and tuning what you got.
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Kurt S - CRG 
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#3
01-03-2005, 04:25 PM
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Re: Making the change: 2BBL to 4BBL
If you're gonna change to a 4 bbl, do a cam swap as well. Otherwise the gains will be minimal like Kurt said. Even with another cam, the heads are probably limiting the potential with small valves. So do the cam, heads and 4 bbl. Or do nothing(it's cheaper). I would look at the ignition system as the best place to pick up some performance.
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69 Z28 JL8, #'s match - being restored
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#4
01-03-2005, 06:16 PM
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Re: Making the change: 2BBL to 4BBL
Jeff I hate to disagree with the head statement but you are not going to pick up a great deal of noticable in the seat of the pants HP by changing the heads on a low compression street car. If you had the motor on a dyno it would be such a small gain that the cost would not warrant it. Heads only make a difference above 4,000 RPM.
In my opinion a good mild Hyd cam and a four barrel carb with the timing set up right, makes for a very drivable street machine with out spending a small fortune. Pantera
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70 BM Phase III GT Vette 69 BM SS427 GT vette? 69 L78 Nova 7k mi 73 Pantera 69 Vette B/P SCCA
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#5
01-03-2005, 06:33 PM
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Re: Making the change: 2BBL to 4BBL
Put the Q-jet and cast intake on. Have the distributor rebuilt and if everything else is where it should be and up to the correct tune up, the car will perform good with NO complications. Don't need to change cams, heads, headers, etc. Clean it up and paint the engine to look nice. Make it a one day project. Don't need to over engineer it.
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#6
01-03-2005, 07:26 PM
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Re: Making the change: 2BBL to 4BBL
ive got a q jet off my original 69 307 car that maybe the numbers you need if going correct. its stored a state away but i could have it shipped over to you. pm if interested.
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69 camaro
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#7
01-04-2005, 06:40 AM
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Re: Making the change: 2BBL to 4BBL
That's the great thing about cooking with a "small block chevy", every chef has their own recipe. Just make sure you don't overcook it!
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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#8
01-04-2005, 06:58 AM
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Re: Making the change: 2BBL to 4BBL
[ QUOTE ]
Don't need to over engineer it. [/ QUOTE ] You said it Sam. 
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#9
01-04-2005, 10:31 AM
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Re: Making the change: 2BBL to 4BBL
[ QUOTE ]
Don't need to over engineer it. [/ QUOTE ] I too agree. Try the simple route. Tune it (esp the dist) and get what it will give. If not happy, run a baseline test (say 30-60 in second gear), then try your 4 bbl swap and compare.
__________________
Kurt S - CRG
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