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Old 04-22-2003, 09:37   #1 (permalink)
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Cleveland 2V and 4V???

is the 2V/4V just the number of valves??

I can't remember where but I'm sure that I remeber reading long before i had one that there was more to it than that... is that true??

I also know 4V engine has a higer power output, what would need to be changed inorder to convert a 2v engine to 4v... if its possible at all??

Thanks in advance :)
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Old 04-22-2003, 10:40   #2 (permalink)
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What's Better? 2V or 4V??
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Old 04-23-2003, 02:52   #3 (permalink)
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Quote:
Originally posted by EBXR
What's Better? 2V or 4V??
That thread pretty much sums it up. Don't discount 4V heads low end pull. Remember XY GT Automatics were fitted with them and a 2.75:1 diff ratio and they were no slouch.
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Old 04-23-2003, 03:29   #4 (permalink)
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4Vs can pull very hard from down low.. cam choice is the key. Get a cam that has high lift and long duration and it will all be top end. Get a cam with high lift, shorter duration and a smaller overlap (lower degrees of overlap) and the thing will go very well from low revs.
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Old 04-23-2003, 03:49   #5 (permalink)
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Correct, it is all about getting a good combination, parts that compliment each other, not work against each other.
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Old 04-24-2003, 04:56   #6 (permalink)
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2V closed chamber heads (good comp ratio) machined to fit the bigger 4V valves are also a great combo.

If they are ported in the right spots they provide great top end flow without sacrificing your low end torque. Good street strip combo.

In answer to your question, 4V stands for 4 venturis (ie: 4 barrels on the intake manifold), not "4 valves", so 4V's still have 2 valves per cylinder but they're heaps bigger and the ports are bloody huge!

All you do is swap the heads over (they fit just the same). You'll need a new manifold and extractors to match because they are different (bigger ports).

.....and as they guys above said, a cam to make the whole combo work together.
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