1998 5.7 AIR INTAKE MANIFOLD

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justagrowr

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Does any one have an early MERCURY MARINE 350 INTAKE MANIFOLD AS COMPLETE AS POSSIBLE - 1997 -1998 ? GOING TO TRY TO DO A VORTEC SWAP ON A 1997 TAHOE 2DOOR 4WD - THANX.IN ADVANCE MATT
E'mail > [email protected]
 

justagrowr

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I have a marine intake setup if you're interested in a semi-stock set up. Cast lower, aluminum upper complete with fuel rails, fuel regulator and 8 injectors as well as 8 injector connectors. Just bolt on your stock throttle body. Or you can get a Holley 300-263 vortec style intake as a starting point for an aftermarket conversion. You'll need an EFI elbow to accept a new 4 bolt throttle body and new injectors as well as connectors and fuel feed connections.
Do you still have the mercury intake MFI fòr a vortec 350/5.7L , I am interested, hit me up please with the price etc. .thanx Matt ( [email protected])
 

Singlecab

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Is this an acceptable coolant bypass? When I had the machine work don’t on my heads I took the intake in as well, and he drilled and tapped the port for the temp sensor, but suggested I use this existing port as the bypass
 

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1998_K1500_Sub

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Is this an acceptable coolant bypass? When I had the machine work don’t on my heads I took the intake in as well, and he drilled and tapped the port for the temp sensor, but suggested I use this existing port as the bypass

^^^ IMHO, yes.

I had random overtemp problems on a 5.7 Vortec that I retrofit into an S10 using an Edelbrock manifold.

The manifold had a bypass like yours but I had blocked it. I was younger then and didn’t understand its necessity.

I then plumbed that bypass and the overheat problem went away.
 
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1998_K1500_Sub

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It does seem to go to same place

^^^ Yes, it does…

….but it makes a difference.


Here’s a picture of mine, coming off the front of the manifold.

If you follow the hose, you can see that it is tee'd into the return line from the heater, which carries coolant to the water pump.

You can accomplish the same thing any number of ways, this is just how I did it.

Cosmetically I don't like the arrangement on mine, but I've never taken the time to clean it up / dress it up.

I'm guessing that bypass hose needn't be 1/2" (which is what I used). The fitting on my manifold, as machined by Edelbrock, is 3/8" NPT (figure below).
 

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