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Old 05-02-2010, 02:32 PM   #1
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So im sure someones already posted this kind of question before but after browsing forums i couldnt find it so im just goin to ask anyways. i have the intake, wiring harness, injectors, pcm, supercharger (M62), and other random parts of my series 1 3800. attempting to supercharge a series 2. i know the lower end of the motors are different, while same bore stroke, theres like an inch difference in pushrod length and yada yada yada. would series 1 heads work on series 2 block? is there deck height differences? would it physically bolt up even if lifters and all that would be wrong? another question is would intake from series1 work with series 2 sc or non sc heads? i know the M90 has a much bigger extension to reach the belt, but this is due to placement of intake right? and i heard only difference for the wiring harness between series1sc and series2 sc is maf or map and transmission. ive already dropped a 4t60e from my series one and connected it to my series 2 which i believe had the 4t65? its not that big of a deal if you have a wiring diagram to rewire the connector. just tryin to learn a bit, any information is appreciated, i know, stupid questions, stupid answers, but lets try to keep them to a minimum thanks guys.
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Old 05-02-2010, 03:03 PM   #2
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I do believe the intake manifolds fit differently. Someone in my top swap for sale thread told a member with a S1 it wouldn't work since its an S2 kit so it probably won't work the other way around either.
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Old 05-03-2010, 09:15 AM   #3
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The quick easy answer is no, the heads don't fit. And for the price of the S2 stuff these days, it'* not really worthwhile fighting the battle. If you need stuff low cost, holler. I know a buddy that sells top swaps for $300 complete.
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Old 05-03-2010, 07:30 PM   #4
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Quote:
Originally Posted by parkaveultra93 View Post
So im sure someones already posted this kind of question before but after browsing forums i couldnt find it so im just goin to ask anyways. i have the intake, wiring harness, injectors, pcm, supercharger (M62), and other random parts of my series 1 3800. attempting to supercharge a series 2. i know the lower end of the motors are different, while same bore stroke, theres like an inch difference in pushrod length and yada yada yada. would series 1 heads work on series 2 block? is there deck height differences? would it physically bolt up even if lifters and all that would be wrong? another question is would intake from series1 work with series 2 sc or non sc heads? i know the M90 has a much bigger extension to reach the belt, but this is due to placement of intake right? and i heard only difference for the wiring harness between series1sc and series2 sc is maf or map and transmission. ive already dropped a 4t60e from my series one and connected it to my series 2 which i believe had the 4t65? its not that big of a deal if you have a wiring diagram to rewire the connector. just tryin to learn a bit, any information is appreciated, i know, stupid questions, stupid answers, but lets try to keep them to a minimum thanks guys.
The deck height is in reference to the block. The series 1 deck is 1" higher, so everything changes. The width of the lower intake manifold is different because of that 1", and that'* not even your biggest problem. The pushrod lengths are different, and the biggest deterrent from ever trying this is that it uses a different cam. The valve order is different so you'd have to get a custom cam ground to fit, along with the custom lower intake manifold.

One guy I know of with a custom dual-engine w-body Cutlass supreme was working on a project for fitting Series 2 heads on a Series 1 block. There are advantages to the taller deck height and the better flowing Series 2 heads, but he stopped at trying to make spacers for the maniold and getting a custom cam ground. I have no idea how far he'* gotten now since we haven't heard from him in 2 or so years. Getting Series 1 heads onto a Series 2 block is the worst of both worlds. The s2 heads have larger valves and flow much better than the S1 heads, so you'd basically be creating a bastard of a motor that would be weaker than just pulling a supercharged Series 2 from a junkyard or top swapping yours.

Don't expect the 4T60E to last very long with a supercharged Series 2.
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