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Re: 4g61?
it will get the same gas miles out of it as the 63. 90% of the 3g guys go to the 63 block for off the shelf parts for the engine. the 61 will hold just fine for not to high of boost in them.
Just go with the 4g63 it is easy to get part for it over the 4g61 internals and there is a ton more 4g63's out there
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