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Switching Valves

2K views 3 replies 4 participants last post by  68NovaSS 
#1 ·
Earlier I talked about using 14014416 heads on my 84 vette.
Well now I def have to cause my 3998920 heads that came off the vette one has a crack in it. I am going to switch out the valves cause the vette valves are bigger than the 416 valves. Do i have to modify the heads to switch the valves???????
 
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