Carb swap- CFM?
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Mopar Fan
Joined: Aug 2021
Posts: 32
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From: Kansas
Carb swap- CFM?
Hello!
I'm looking to swap the Carter 2bbl on my 318 to a Holley 4bbl with electric choke and vacuum secondaries. What is a good CFM rating to buy for my 318 engine?
Side note- What do you folks think the redline on my '78 318 would be? The aftermarket tach has a redline at 3,000, but that seems ridiculously low to me. Any idea where the ceiling actually is?
I'm looking to swap the Carter 2bbl on my 318 to a Holley 4bbl with electric choke and vacuum secondaries. What is a good CFM rating to buy for my 318 engine?
Side note- What do you folks think the redline on my '78 318 would be? The aftermarket tach has a redline at 3,000, but that seems ridiculously low to me. Any idea where the ceiling actually is?
Mopar Lover
Joined: Apr 2010
Posts: 1,889
Likes: 170
From: Long Island, NY
RS -
Assume bone stock, 450 to 600 cfm and 600 might be a stretch.
Again, assuming bone stock and not recently rebuilt, I'd be edgy about going passed 5000.
Still you'd need a dyno to find out for sure, since components wear and early valve float is more probable.
Archer
Assume bone stock, 450 to 600 cfm and 600 might be a stretch.
Again, assuming bone stock and not recently rebuilt, I'd be edgy about going passed 5000.
Still you'd need a dyno to find out for sure, since components wear and early valve float is more probable.
Archer
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