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Old 06-27-2018, 12:04 AM   #1
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Default Vg33 heads on vg30 block

Will vg33 heads bolt onto a vg30e block? Found problems with my vg30e heads and I'm looking to get heads with better flow
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Old 06-27-2018, 01:59 AM   #2
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They can.
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Old 06-27-2018, 04:49 AM   #3
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Coolant passages are different. Not really recommended but it can be done. IMHO, if you plan to go through that effort you would probably be better off with a VG33 swap or doing a port and polish on your VG30 heads. A port and polish by its self won't get you much power and I highly doubt VG33 heads will do much by themselves but coupled with other things that can make a difference.
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Old 06-27-2018, 10:35 AM   #4
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I thought the VG33 heads had better flow. Maybe it's the other way around. I don't know. Anyone have a link to the answer?

VG33 heads have better exhaust studs! They are bigger, so you might have to drill out your exhaust manifolds. The Pacesetter headers Deerhurst and I used have large enough holes to fit the larger exhaust studs.
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Old 06-27-2018, 01:07 PM   #5
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The VG33 heads to flow better. If I remember right the OWO heads are the ones you want. I have no idea how common the OWO are. My JDM motor has them.



The coolant passages are different from the VG30 block to the VG33 head. You will have to do some magic with the gasket to make sure you get water where you need it and not where you don't. If you want to go to the larger head with thoughts of boring the VG30 later don't. Cylinder wall thicknesses are such that you don't want to do that. A VG30 will not make it to 3.3L. I heard of VG33s making it to 3.8L.



You can also drill out the VG30 head for the larger stud.
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Old 06-28-2018, 02:41 PM   #6
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Deerhust Im rebuilding my engine and Im getting a lot of aftermarket parts and I found major problems with my current heads and I thought if I'm rebuilding this I might as well get everything out of it that I can without doing crazy modifications or spending a shit ton of money
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Old 06-28-2018, 02:44 PM   #7
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And my engine is a Frankenstein engine already so I just want to get it running better than before
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