A46 intake on l20b

Engine, Transmission and related drivetrain.
Speedracer906
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A46 intake on l20b

Postby Speedracer906 » 11 Apr 2016 21:52

So, what are peoples thoughts on useing an A46 intake on a 20 over, polished intake l20b?

-it's what I got and I'd like to use it. :)

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okayfine
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Re: A46 intake on l20b

Postby okayfine » 12 Apr 2016 05:46

Pictures/description? I've not heard of "A46" before.
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510rob
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Re: A46 intake on l20b

Postby 510rob » 12 Apr 2016 10:16

use it and tell us how it works!

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okayfine
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Re: A46 intake on l20b

Postby okayfine » 12 Apr 2016 18:15

If you would have said a "42" intake, well, that's a different story. I could get behind that.
Because when you spend a silly amount of money on a silly, trivial thing that will help you not one jot, you are demonstrating that you have a soul and a heart and that you are the sort of person who has no time for Which? magazine. – Jeremy Clarkson

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Re: A46 intake on l20b

Postby 510rob » 12 Apr 2016 20:16

waa waa 42 waaaaaa

datzenmike
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Re: A46 intake on l20b

Postby datzenmike » 12 Apr 2016 21:10

Speedracer906 wrote:So, what are peoples thoughts on useing an A46 intake on a 20 over, polished intake l20b?

-it's what I got and I'd like to use it. :)


I think you said you have a 77 620. The intake you mention is currently on an L16.

The '77 L20B has a co-joined intake and exhaust manifold so you can't just fit an earlier or later intake unless you get a separate exhaust manifold for it. If this is the plan then an L16 intake isn't the best way to go as it will have smaller runners. Later '78-'80 L20Bs used a separated intake that does have the larger ports.

Now the reason the '75-'77 intakes and exhaust are joined is it uses exhaust heat to warm the intake and help evaporate the fuel droplets. Intakes before the L20B and the later '78-'80 intakes use engine coolant and why there are two coolant passages in their intakes and none in yours. If you swap an earlier or later intake on you will have to drill holes in your U67 head and pipe the water into the coolant by pass hose coming out of the thermostat housing. It can be done but why not just run it the way it is now???
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Speedracer906
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Re: A46 intake on l20b

Postby Speedracer906 » 17 Apr 2016 06:07

Thanks Datzenmike,
My 620 came to me less the engine, trans and driveline, the previous owner pulled them for a chinook project.
I was sitting on a l20b longblock for over 20 years, that now has a rebuilt block. I was also given, what seems to be a a87 head (you helped me with this identification), that was gasket matched or ported out to 1.5"(intake), like the l20b. I was also given, with the truck, an l16. As of last week I only had the a46 intake. A friend has an l18 intake, and I just remembered that I have some assorted Datsun pieces and parts stashed in that same friends storage building; maybe I have an intake and exhaust there..
I'll gather all my parts and re-address my mix and match issues later.

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okayfine
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Re: A46 intake on l20b

Postby okayfine » 17 Apr 2016 07:15

Still unknown what an "A46" intake is. If it's just cast into the manifold and is a stock L20B manifold, you might want to make that clear. If your head has been ported to 1.5", has other work been done (bowl, unshroud, etc.)? Better the head ports at 1.5 than manifold at 1.5 and head at 1.25 or the like.

Would be interested to see pictures.
Because when you spend a silly amount of money on a silly, trivial thing that will help you not one jot, you are demonstrating that you have a soul and a heart and that you are the sort of person who has no time for Which? magazine. – Jeremy Clarkson

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James
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Re: A46 intake on l20b

Postby James » 17 Apr 2016 09:50

DSC03125.jpg
DSC03125.jpg (128.32 KiB) Viewed 773 times


I think its a stock L16 intake - most likely.
Finished is better than perfect......

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okayfine
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Re: A46 intake on l20b

Postby okayfine » 17 Apr 2016 11:56

Oh. OP will definitely want to find and run an L20B intake on the L20B. Runners and ports on the L16 manifold are smaller, not even accounting for the 1.5" head ports.
Because when you spend a silly amount of money on a silly, trivial thing that will help you not one jot, you are demonstrating that you have a soul and a heart and that you are the sort of person who has no time for Which? magazine. – Jeremy Clarkson


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