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Author Topic: 3400 heads what exhaust manifolds  (Read 1438 times)

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tgpred89

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3400 heads what exhaust manifolds
« on: April 17, 2016, 08:46:46 PM »

I am in the process of building a 3400 motor for my olds alero.  I'm not trying to build anything crazy, just a quick everyday driver.  I have a 89 tgp that needs more work than I'm willing to put into it.  I know the t25 is a little small for the 3400 but I already have all of the parts and can do it for practically no money.  That being said I know about all the differences between the 2 motors.  I know as far as exhaust manifolds I don't have a whole lot of options.  I've heard that porting the 3.1 manifolds to D shape to fit there's not much metal left for sealing.  My plan was to use a log style 3100 rear manifold and cutting the 2 bolt flanges off the TGP crossover and putting the 3 bolt flanges on it.  If I do that will the crossover match up or is my only option porting or custom headers?  Thanks
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