What does it take to swap intake manifolds?
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Northstar Engines and System Technical Discussion Discussion, What does it take to swap intake manifolds? in Cadillac Engine Technical Discussion; I want to run a holley on a 94 northstar, and have been told I need either a) a 95+ ...
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    eldorado1 is offline Cadillac Owners Connoisseur
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    What does it take to swap intake manifolds?

    I want to run a holley on a 94 northstar, and have been told I need either a) a 95+ engine, or b) to swap the complete intake from a 95+ onto my 94. What does an intake swap take?

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    dloch is offline Cadillac Owners Fanatic
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    Re: What does it take to swap intake manifolds?


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    Re: What does it take to swap intake manifolds?

    Quote Originally Posted by eldorado1
    I want to run a holley on a 94 northstar, and have been told I need either a) a 95+ engine, or b) to swap the complete intake from a 95+ onto my 94. What does an intake swap take?
    The cylinder heads on a 93 and 94 engine only have 2 intake bolts per head (4 total for the intake manifold - 2 per side) That is because the 93/94 engines used the large, plenum style intake manifold with the silver top cover being the actual top of the intake manifold enclosure with the plastic tuning tubes, fuel rail, injectors, etc. all inside the box. The whole intake assembly attached to the cylinder heads with two bolts per side and there were phenolic spacer plates between the intake and the cylinder heads.

    The 95 and later Northstars used the one piece injection molded plastic intake manifold that has 5 intake bolts per side. 2 of the bolts are in the same location as the 2 bolts for the 93/94 cylinder heads. There are an additional 3 bolt holes per side on the 95 cylinder heads....and there are no phenolic spacer plates nor provisions for EGR introduction into the ports in the 95 cylinder heads like there were on the 93/94 heads.

    I think what you meant to say in your post was that you need to put 95 or later CYLINDER HEADS on your 94 in order to use the holley intake manifold that CHRFAB sells.....

    The best person to ask is Alan Johnson at CHRFAB.... Possibly you can drill and tap the 94 cylinder heads for the extra bolt holes for the Holley manifold.

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    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: What does it take to swap intake manifolds?

    Well I was told the intake manifold from the 95+ engines would work on the 94, but I would need to either swap heads or drill extra holes... I just wanted to see how much work it would be... Sounds like I need a 95+ engine then... Anybody want to trade me?

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    dloch is offline Cadillac Owners Fanatic
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    Re: What does it take to swap intake manifolds?

    Quote Originally Posted by bbob
    The cylinder heads on a 93 and 94 engine only have 2 intake bolts per head (4 total for the intake manifold - 2 per side) That is because the 93/94 engines used the large, plenum style intake manifold with the silver top cover being the actual top of the intake manifold enclosure with the plastic tuning tubes, fuel rail, injectors, etc. all inside the box. The whole intake assembly attached to the cylinder heads with two bolts per side and there were phenolic spacer plates between the intake and the cylinder heads.

    The 95 and later Northstars used the one piece injection molded plastic intake manifold that has 5 intake bolts per side. 2 of the bolts are in the same location as the 2 bolts for the 93/94 cylinder heads. There are an additional 3 bolt holes per side on the 95 cylinder heads....and there are no phenolic spacer plates nor provisions for EGR introduction into the ports in the 95 cylinder heads like there were on the 93/94 heads.

    I think what you meant to say in your post was that you need to put 95 or later CYLINDER HEADS on your 94 in order to use the holley intake manifold that CHRFAB sells.....

    The best person to ask is Alan Johnson at CHRFAB.... Possibly you can drill and tap the 94 cylinder heads for the extra bolt holes for the Holley manifold.

    Are the heads the same between 93 to 99 other than the extra intake bolt holes?

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