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post #1 of 6 (permalink) Old 07-07-04, 09:06 AM Thread Starter
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Supercharged engine... 2V or 4V OC?

I have this blower on my car. I have 2V open chamber heads. I will eventually need to do NEW heads (to get rid of crappy multi-groove valves), and since the only cost I will have is valves (already have springs, retainers, and locks) and the cost of some 4V castings (if I cant get grandpa to give me the old CJ heads he has in his garage), I might as well debate whether to go 2V open or 4V open.

If I stick with the 2V I would have to do a full port job. Since I know jack about porting, any attempt I make would probably be a) not enough, and b) hurt more than it helps. That, and I HATE working with carbides (damn metal splinters get everywhere).

if I go 4V, I would still need to port match, but would I need to do much else? The exhaust side could use some work, but on a boosted car, I dont want it to be TOO good do I?

Performance... will the blower make up for any "lack of" low end velocity in these heads? Does the fact that I already have a 2500 stall and 3.89 gears make this question unnecessary?

Either way I am getting a new intake and new headers, so those are not considerations. The cost of 4V OC castings is minimal, so its basically a question of how much porting I would have to do on the 4V and if there is a performance delta in the equation.

Oh, the blower:


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post #2 of 6 (permalink) Old 07-07-04, 10:26 AM
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Re: Supercharged engine... 2V or 4V OC?

That's cool. I saw a car with that same set-up. I think he needs 4v heads.....
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post #3 of 6 (permalink) Old 07-07-04, 11:30 AM
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Re: Supercharged engine... 2V or 4V OC?

Out of my league with answers to your questions. Nice set-up there.

But one question I have for you, if you don't mind answering.. That is a 'blow through' type of blower, how does the Holley carb handle that? I always thought you could only use a Holley with a draw through set-up or put them in a sealed enclosure?

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post #4 of 6 (permalink) Old 07-07-04, 12:56 PM Thread Starter
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Re: Supercharged engine... 2V or 4V OC?

Quote:
Originally Posted by STROKEXD
Out of my league with answers to your questions. Nice set-up there.

But one question I have for you, if you don't mind answering.. That is a 'blow through' type of blower, how does the Holley carb handle that? I always thought you could only use a Holley with a draw through set-up or put them in a sealed enclosure?
Holleys can be made for blow through as well. I think the only changes you need (other than tuning) are seals on the throttle shafts and solid floats. I had mine built by Sean Murphy Induction.
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post #5 of 6 (permalink) Old 07-07-04, 03:10 PM
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Re: Supercharged engine... 2V or 4V OC?

Try here also;

http://www.network54.com/Forum/119419
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post #6 of 6 (permalink) Old 07-07-04, 05:28 PM
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Re: Supercharged engine... 2V or 4V OC?

Quote:
Originally Posted by paull
This has already been cross-posted to the US 335 series forum.

http://www.network54.com/Forum/threa...eid=1089208557

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