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Old 01-24-2020, 11:29 AM
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after market intake manifold install

ok so i have an 87 yj with the 258 in it that i had rebuilt .030 over. I'm installing a new Offenhouser intake manifold and a TBI set up to it. Do i need any of the extra ports I.E. the coolant hose elbows or the exhaust pipe conection or any othe r opening that's not the TBI? I cant find anything online that tells me one way or the other. Any help would help.

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Old 01-24-2020, 01:30 PM   #2

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Old 01-24-2020, 02:26 PM   #3

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Old 01-24-2020, 11:21 PM   #4

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Welcome to the Forum justfinished,

If the manifold is set up for the coolant fittings, I suggest you find original fittings if they'll fit the aftermarket manifold. If you can't find any or if they don't fit, I suggest you adapt whatever fittings will fit. The engine was designed to run coolant through the intake manifold and if Offy went to the trouble to cast a coolant jacket into their manifold, it's probably necessary.
The manifold should have a fitting near the rear for vacuum to the heater. The vacuum is necessary to open a flap in the heater box so that you'll get fresh air.

As far as the exhaust pipe connection, a stock manifold has two studs that hold the exhaust pipe flange (and thus the exhaust pipe) secure against the bottom of the manifold.
Post a couple pics of the exhaust opening on the manifold if you need any more suggestions.

Good Luck, L.M.
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