Hi Luigi, I think between what you've said and what Steve said you've got it all under control.

the cast sections near the carbs are usually drilled to accomodate mounts for the throttle shaft linkages using a rod end, I would drill some small holes near the cylinder head face section and then link together with 3mm id rubber vacuum hose and take of from there whatever you need.

Using a single point for Brake vacuum is not as good as using two points of vacuum supply better feel with less pulsing at lower rpm.

Yes you manifold has four runners going each to an individual cylinder, I take it you are using a Redline Australian made twin side draught manifold or is it a Japanese one like Tomei?

Mikuni Solex side draughts mount solid with a phenolic (Bakelite like plastic) heat proofing spacer, Webers or dellorto Carburettors like a soft mount though the best of these were fitted standard to the datsun 2000 Roadster with the 150 HP engine option with twin 44mm Mikuni Solex sidedraught carburettors.
They may still be able to be found if you look here where they make good replacement parts.

http://www.fairladyparts.com/page28.html

Hi!

Many thanks for your quicly replies.
Let me Know if i understood, because my englsh is not the best

You told me or i understand to make 4 holes on intake mainfold with 3.5mm diâmeter drill
runner means individual intake? My intake mainfold has 4 runners? Correct? So i will make four drills on top to each runner. After i put it on 4 bleeders (like you inform on E-BAY I WILLBUY IT) with hoses and lknk all 4 hoses to 1 hose and put the pcv valve and then to block breather


That`s it mr Lamb?

Thanks

Luis

this intake on picture has four marks to drill near where the carbs were be acopulated. that i will or wont to do?
I want to do a precision job, so i need every detail

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That's pretty much what I did.

I put a bleed screw in each runner to get an even distribution of idle air. It just makes tuning easier, give a more consistent "draw" and got the idle speed about right (bypass air). From memory I drilled it out with a 3.5mm drill after figuring out how much metal would be left and how straight I thought I could drill it.

So my idle air is more or less drawn through the crank case. It's better to have a good flow of air through there to keep the oil dry and your rocker cover clean. It also means less VOC emissions.

I am thinking like you - I don't like oil vapor separators. Better to keep the crankcase clean.

The brake booster has a check valve and a Plenum of sorts (vacuum chamber) so it can build up vacuum from a pulsing source. So it is OK to connect to one runner.

I suspect simply connecting PCV to one runner will have a poor effect on idle. The factory Datsun sidedraft manifolds have a small chamber connecting runners 2 & 3 and the PCV is connected there. So you might try Tee-ing both of the bosses together and connecting the PCV to it. Let us know how well it works. Few have made effort to connect PCV to a racing manifold.

Hi!

Many thanks for your reply.
My intake mainfold has one hole for a vacuum hose booster and one mark to make another hole.
If i drill the mark, can i introduce a brake bleeder on mainfold and insert a PCV valve and link to block breather. Or put a T on intake mainfold, one for vacum booster and another for PVC valve?
In rocker valve put a filter.
I dont like the ideia to connect both breathers to an oil-vapor separator.
What do you think?

Luis

Luckily I took a photo sometime before for someone else. It's a bit cluttered but hopefully you can see what's going on.

Edit: I didn't take a photo of the bleed screws I modified but hopefully you get the idea.

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Hi!

If you please can send me some pics of your system breather, i thinhk you make perfect job and i would like to make it equal.
My intake mainfold has plug for booster. (i can install the vacum booster too?)

My intake mainfold is the picture enclosed

Many thanks

Luis

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I bought these http://www.ebay.com.au/itm/BRAKE-BLEE ... -PACK-OF-10-/200730472846 and ran a drill down them to get rid of the seat. I then tapped a hole for one in each runner. Then I connected each one to a vacuum tree and plumbed the PCV valve and plumbing into that. Works a treat and was pretty easy to do.

Peeps should consider the round port head for EFI with that manifold by DD above as there is a member with 100kws atw with efi and boost yet has no special cam yet.

For what most are after on the street round port head with efi and boost is overlooked