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L20 Aftermarket Intake Manifold Offenhauser,Edelbrock,Cannon

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Description

Was looking for L20 aftermarket intake manifold, Anything Offenhauser, Cannon Edelbrock. 

Also Need Headers

 

Thanks

San Fernando Valley , California





Recommended Questions

Down draft or single or dual side draft?

 

I imagine that a truck header is different from a car for clearing the torsion bars.

Luisgman

Posted


I needed for a down draft , yeah I have a 1979 620 king cab so round port headers

I found a offenhauser for a L16 do you think it will work on my truck? It’s the one with the slip port in it. Sorry to ask you here but I know your the expert

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Depends on what cylinder head port size you have AND what port size the Offy or Edelbrock intake manifold is!  The late W58 L20B cylinder head is the BIG PORT, so you really want the correct matching big port intake.  I was just sitting down to ask these questions, cuz I have two dual plane Offy intakes, but so far one is for the L16 small port head, the other is still bolted on an engine in a car!

 

Let us know what intake port size you have OR what cyl head CASTING # you have!

 

TJ

Denver CO

Luisgman

Posted


The casting # w58 

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I had one of the "Dual Plane" (split port) manifolds.

The damn web between the ports was stupid thick, and it flowed less than the stock manifold.

 

There is a nice Redline manifold on eBay right now (for the Weber DGV) for like $250.

Luisgman

Posted


yeah I seen that one too,  they offered me the offenhauser so was considering it, for half of that 

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W58 cyl head casting is a BIG PORT, so you really do NOT want the earlier Offy for the L16 small port "210" casting.

 

I just had an old school 510 guy here today that used to modify back in the 80's & early 90's.  He said they dyno'd an L20B with different downdraft intake manifolds using a 32/36 Weber.  He said that the casting #W58 INTAKE manifold (cast on the top of the rear runner) flowed the best!  I sell every W58 L20B intake that I list!  You likely have a W58 INTAKE manifold on you 620.

 

I also have a BIG port Edelbrock manifold, but kinda want to hang on to it for an L20B 510 build........ 

 

So every time I pick up my L16 SMALL port Offy intake, I chuckle, cuz the "split" dual plane ports are TINY............really only suited for the small port L16 "210" cyl head!!

Luisgman

Posted


well if you decide to sell the deep one let me know thanks

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Do you have the stock W58 intake on your truck?

Luisgman

Posted


Sorry I was trying to say if you decide to sell the Edelbrock let me know 

Yes I have a stock L20 manifold

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For a downdraft stick with the stock intake. Get a weber 32/36 that everyone raves about. >$300 and done.

 

 

I understand the theory of the Offy intake but even if the intake runner air speed is faster, it dumps into the stock intake port and slows down again. I agree with G Duax it can't possibly flow as much as the stock one. Like the 3 angle valve job. On the bench machine held just barely open it looks impressive but in the real world the valve spends very little time there.

 

 

Luisgman

Posted


How about the cannon intake manifold you think that’s any good ? They sell a new one on eBay from redline

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Not bad, but $250 ??  I could see under $175

And I had one of those also, damn runners are fairly small, then open up right before the head.

Don't think anyone ever made a true downdraft L4 manifold.

All that I've seen have little runners so any dummy can bolt them onto a stock engine, and feel good.

 

Someone sells just the head flanges on eBay that would be fun to play with.

A little thick wall aluminum tube, a little aluminum plate, and a little welding, and who knows what you could come up with. 

How about a tunnel ram :)

Luisgman

Posted


Thanks for all your help guys, I have a new Weber 32/36 so I am just going to use stock manifold, know my exhaust manifold is broken and need to replace it, hard to find because is round port , some guy selling some  new headers square port  for like $160 so I think I might do that and call it a day

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I don't see a Canon downdraft intake manifold on eBay!  Links are a pain to post here............what does the eBay listing title say?  I'm curious!

 

I think you will do just great with a stock W58 intake & a new 32/36! 

 

TJ

Luisgman

Posted


Any headers for sale? Lol 

in search put down Datsun manifold highest to lowest price and you eventually see it around $240 

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RFFQD1p.jpg

 

Still the best bang for the buck.

 

I did this on a U67 head, which other than the exhaust port shape, is the same head as the W58. I couldn't find a 2 into one down pipe so I made a KA24E from a 240sx fit.

 

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Luisgman

Posted


Thanks Mike I can get one of those manifolds for around $50 bucks. I will get that manifold probably this weekend, I was just not sure if that would work on my truck ?

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