Has one put motorcycle carbs on there 60 v6?

[trash boat]

My plan is to use the 3500 intake on the 3900 but I've also had the thought of using busa carbs with a distributor. Any thoughts on going that route?

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[Guest]

the 3500 intake will bolt up to the 3900, but the intake ports do not line up with the heads. technically you can bolt the 3500 heads onto the 3900 but it doesn't make sense to do so. The coolant ports between the heads and block are different, plus the chamber in the head will not be centered with the bore of the 3900.

The intake runners on the 3900 are bigger, plus the TB opening is at 75mm where as the 3500 intake is only 65mm. It makes no sense to step down.

I did an ITB setup on a lx9 bottom end. All custom.

[trash boat]

I thought the lz4 fit, flow more and had the same size throttle body? Your throttle body set up is very cool

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[Guest]

I thought the lz4 fit, flow more and had the same size throttle body? Your throttle body set up is very cool

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when you said the 3500 I thought you meant the lx9. yes the lz4 does fit on the 3900(lz9). its a direct bolt on. get a ls1 tb adapter from BCC and you can bolt a 75mm truck tb to it for relatively cheap.

britishcarconversions.com

[carbon]

LX9 != LZ4/9

[trash boat]

Do I have to get the hole manifold? Or can I just grab an upper?

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[34blazer]

A dizzy wont physically fit behind the intake. I hope you reconsider going with carbs and stick with far superior fuel injection.

[trash boat]

I'm just toying with the idea, the odds are I'll just use the lz4

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[neophile_17]

You just need the upper. Later LZ9 (3900) motors came with the LZ4 intake.

[Guest]

A dizzy wont physically fit behind the intake. .

Yes and no.

A modified distributor with a longer shaft will clear the lz9 upper intake wiith a smidge of grinding on the intake. I modified this one and it does work and the engine runs. I tested it. A stock dizzy won't clear the lower intake as it interferes with the runner.





it will not clear the lz4 though without cutting and welding of the lz4.

[trash boat]

If I was to use a "dizzy" I would only be using the lower intake, so clearance wouldn't be a problem if I got a taller dizzy

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[trash boat]

BMW v10 throttle bodies...thoughs might work

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[trash boat]

I think they're 50mm

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[Guest]

the chevette is prob gonna weigh close to 2200 lbs when you are done with the engine swap if I had to guess. If you do a cam, lz4 intake, 75mm tb, you will be close to 300 crank hp. Thats a very good power to weight ratio. it will be fast.

Thats more than enough without the custom made itb intake. Trust me its way more work and money and time then you want to put into it. KISS. You ssaid this is for your daughter. make it simple for her to wrench on.

On top of that, if you do end up putting a blower on it later for yourself, making a custom plenum to mount to an itb intake is going to be a pain. I say forget the itbs

[trash boat]

I have a habit of going to far with my projects...this is supposed to be a simple build. I may just take you advice on this one...lol

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