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2V or 4V 351C

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Old 01-27-2014, 06:26 AM
Dejayp Dejayp is offline
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2V or 4V 351C

Evening team,

I'm looking at throwing a manifold and Holley at my aussie built '81 SWB. But I'm not sure if I have a 2V or a 4V.

At the moment I'm assuming it's a 2V due to the 2 venturi carb. The previous owner said that it's all origional (it looks it too).

Is there anything else I can look at without pulling the manifold off to tell what it is?

Also it's currently tuned to run on gas, I want to tune it to petrol and ditch the gas,along with updating the ignition. Any manufacturers I should avoid?


Cheers and beers....
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Old 01-27-2014, 04:53 PM
BigF350 BigF350 is offline
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2V equals 2 Venturi, so yes you have a 2V.

I believe there was also a number stamped on the top corner of the head just outside the valve cover lip (either 2 or 4).


For changing it back to run on petrol, do you still have the original carb and fuel system?
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Old 01-27-2014, 10:50 PM
Dejayp Dejayp is offline
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Its running dual fuel, so I should be able to disconnect the gas? I'll have to look at the timing as she pings when on petrol, but I'm unsure of the specs....
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Old 01-28-2014, 11:48 AM
BigF350 BigF350 is offline
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Yes, you should just be able to disconnect the gas. You will probably want to clean out the fuel system as best you can, get the carb tuned as well as check the timing. You may need to regap your plugs too.
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Old 01-29-2014, 04:01 AM
oz71BBroadster oz71BBroadster is offline
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Hi, the numbers stamped on the corner of the cylinder head was misleading when trying to determined externally if the engine is large or small port because post 73 4V engines were small port with a cast 4bl manifold. If yours is original it will be 2V. For petrol based systems, any of the major manufacturers dual plane plenums will be ok, personally I have always had a good run with Edelbrocks if sticking with LPG then general consensus is stick with single plane. Regards ignition, steer away from rubbish like Pro Comp and no name eBay specials and stick with mainstream such as MSD or Mallory etc.... Summit are a great source...Enjoy!
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