the 3.5 block is is taller so the t2 heads on it wouldnt let you use the t2 intake without modding it now you can use just the cams, springs and valves from the t2 head in your 3.5 heads then you can use the t2 intake that what most do when they swap the 3.5 in the legends.
Thanx for. the info was very helpfully but if u can explain the intake mod have trouble seeing why its required when I'm keeping the 3.5l block in the RL and just swapping the heads no disrespect your info is very much so valued just trying to gain understanding of what I'm dealing with ..
your best bet is Jonslegend he's in alabama but he make the best 3.5 hybrid swaps ive ever ridden in and drove. But the big boy is the 3.5 with the whole type 2 upper but that would require the intake to be modified as the 3.5 block is a a lil wider.
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