Good morning, I have a 1987 fj60 with an exhaust leak, and have been researching headers vs existing manifold vs the 3fe conversion. I am leaning towards the 3fe option but have a fitting question.
My understanding is the 3fe manifold is 15mm, and the existing intake manifold is 10mm, so some adjustments have to be made. Most recommendations are to shave the manifold down (thus decreasing the strength), or put in a half washer solution (seems jerry rigged to me) for proper fitting. Neither one of these seem ideal to me, so am looking for a different solution.
My question is this, would it be reasonable to fabricate a 5mm aluminum “shim” for the intake manifold to increase the thickness to match the exhaust manifold in order to mount them both? Maybe I’m overthinking this, but don’t want to create more problems in the long run.
Thanks for the thoughts.
My understanding is the 3fe manifold is 15mm, and the existing intake manifold is 10mm, so some adjustments have to be made. Most recommendations are to shave the manifold down (thus decreasing the strength), or put in a half washer solution (seems jerry rigged to me) for proper fitting. Neither one of these seem ideal to me, so am looking for a different solution.
My question is this, would it be reasonable to fabricate a 5mm aluminum “shim” for the intake manifold to increase the thickness to match the exhaust manifold in order to mount them both? Maybe I’m overthinking this, but don’t want to create more problems in the long run.
Thanks for the thoughts.