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Author Topic: Engine Swap help. Pontiac 301 to a Pontiac 400  (Read 1748 times)
Squamish Sasquatch
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« on: April 25, 2011, 05:30:32 PM »

I have a 1980 Trans Am with a non-turbo pontiac 301. I am swapping it with a pontiac 400 (0230162 YT 481988 casting with 5C heads). I want to have the most simple and basic auxillaries and componants so what can I turf? What is the most basic yet ppowerful carb I can switch to? I am not a big fan of the QJ. The 400 has an edelbrock intake on it. I know the hood scoop will be a problem but I'll figure that out. What vacuum systems/ sensors do I need to keep? I do not need to worry about aircare. Also, any suggestions for exhaust manifold or headers that would fit the 400? I am running dual exhaust but would like it to mount difrectly where the 301 exhaust manifolds were. ANy help would be appreciated. Also if you know of any unforseen problems let me know.
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1980 Trans Am, Pontiac 400, 3.08 Posi
Clint S
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« Reply #1 on: April 25, 2011, 06:24:01 PM »

 Is it stock 400.  Most folks here will tell you to run the Quad.   Better mileage and when done right equal or better performance than the others.   I have had decent luck with Holley, but they are gas hogs.   5C heads will net around 7.6 to 1 not too good for performance, so do not bother with a huge carb.   As far a vacuum you need to run the advance canister and the heater controls.  Other than that keep what you want.  Edelbrock performer intake will fit fine RPM will not.  also Holley and E brock carbs will not fit air cleaner base either.   Ram Air manifolds are great and do not cause clearance issues some headers will not allow reverse linkage.   
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tajoe
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« Reply #2 on: April 25, 2011, 08:51:31 PM »

Couldn't have said it any better.I agree with Clint.
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Squamish Sasquatch
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« Reply #3 on: April 29, 2011, 11:02:13 PM »

Thanks. That was so much help.
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1980 Trans Am, Pontiac 400, 3.08 Posi
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