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Im wanted to put gt40 heads on my car I already have the upper and lower intake but was wondering would I need a tune with the heads and what should my fuel pressure be at and what other things would I have to change along with the heads
 

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No tune is really needed for that combo and the 19 lb injectors will be nearing their limit. You will need to upgrade your fuel pump for sure along with the TB and MAF. I would also port the lower GT40 manifold. The valve springs will need to be upgraded also even for the stock cam.
 
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