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So I blowed a head gasket on my 02 tacoma 4x4 2.7. pulled the head to take to machine shop and noticed cylinder 1 is cracked between exhaust valve and spark plugs hole. I can't find a 3rz 4 port anywhere but was able to locate an 8 port 3rz. My question is can I replace the 4 port head with 8 port head if I use the bottom half of intake manifold from the 8 port and use my existing upper intake form my truck?
 

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Yes, that should work. They changed the porting to improve the air flow to the cylinders. Nothing else really changed.
 
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