Forums/Z31P/z31-performance-upgrade-forums engine-mechanical-aa/VG33 heads on VG30 block
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HarvesterUT: (2014-09-03 15:58:07)
I have an 87 300ZX turbo (non W-series) and I plan to build the engine at some point next year.
I know the early VG30 heads do not flow as well as the OWO heads (VG33 engine), especially on the exhaust side. I've learned that that the OWO heads will bolt up to the VG30et block (source RedZ31.com), but I do not know if there are any other changes I need to know about before I go down that path.
Can someone point out issues with my current plan?
- VG30et block (pre W-series)
- VG33 heads (ported exhaust)
- aftermarket VG30et cams
- Adjustable VG30et cam gears
- aftermarket valves & springs
The VG33 heads have the 10mm exhaust studs, so will the stock VG30 manifolds fit with modification?
Is there anything else I need to know?
Thanks!
nismopu: (2014-09-03 16:21:29)
You can run the round tooth gears if you source a round tooth crank gear. You should anyway if you are going through the engine like this, IMO. Everything looks good the only thing I see missing are MLS head gaskets to keep that sucker sealed and maybe pair them with ARP head studs for extra insurance! lol!
Anyway, welcome to the site!
jaqattack02: (2014-09-04 01:43:52)
I'm putting the VG33 heads on my A/B series 86NA block. So, to answer…
Can someone point out issues with my current plan? All of the below looks good, I'm doing the same
- VG30et block (pre W-series)
- VG33 heads (ported exhaust)
- aftermarket VG30et cams
- Adjustable VG30et cam gears
- aftermarket valves & springs
The VG33 heads have the 10mm exhaust studs, so will the stock VG30 manifolds fit with modification? Yes, you just have to drill out the holes for the studs on the manifolds a little.
Is there anything else I need to know? Not that I can think of. Just make sure you use the headgasket that goes with your engine, and not the one that would apply to what the heads came out of.
Thanks!
HarvesterUT: (2014-09-05 15:19:58)
Hey guys,
Thanks for the advice! I'll definitely do the ARP bolts and MLS gaskets. Seems like cheap insurance. I didn't think about swapping over to round-tooth belts. Is there any benefit to round-tooth over square beyond longevity?
darryl rice: (2014-09-05 22:50:27)
They make a Goodyear Racing timing belt, that is the color blue, that fits the square tooth cam gears. To me that looks sharp when the timing cover is removed
jaqattack02: (2014-09-06 00:25:24)
It's not goodyear, it's Gates Racing.
300zxturboftw: (2014-09-08 14:14:57)
The gates racing belt is stronger. The expensive version is actually kevlar reinforced
Augustus Maximus: (2014-09-09 17:21:29)
1994 Maxima crank gear is what I'm running on my A/B Series VG with VG33 round tooth cam sprockets.
http://www.courtesyparts.com/13021-s…611_1612_1620&
jaqattack02: (2014-09-09 19:06:27)
Just thought I'd update that my install was successful. Car started and ran on Sunday night. 1986 A/B series NA engine with OWO heads and Isky cams, using A/B series head gasket.
darryl rice: (2014-09-10 04:18:43)
It's not goodyear, it's Gates Racing.
My bad.., not sure why I mention Goodyear
jaqattack02: (2014-09-10 20:38:56)
Here's the engine semi-assembled with the fancy blue belt.
[archived image: 20140906_170253_zpskm8wfnqe.jpg]
HarvesterUT: (2014-09-19 16:21:44)
jaqattack02 - It's hard to tell from the photo, but I assume that's a square-tooth timing belt and Russ' adjustable cam gears?
300zxturboftw: (2014-09-19 17:49:21)
Did the injector and air ports line up correctly with the Lim to head?
707Redz31: (2014-09-19 18:37:49)
Yea that's a square tooth set up with Russ's gears. They only make the gates racing belt with square teeth.
300zxturboftw: (2014-10-02 22:05:12)
Did the injector and air ports line up correctly with the Lim to head?
Plz answer this jaqattack! Did you use vg 33 LIM or 30 LIM? I want to get mine squared off before I tune.
88sinZ: (2014-10-03 01:38:20)
Plz answer this jaqattack! Did you use vg 33 LIM or 30 LIM? I want to get mine squared off before I tune.
30 LIM can use matching injectors, 33 LIM must use matching style - the diameter is different for injector O-ring seal. easiest/ideal 33 set up is short block only.
gasket for LIM to a/b-W-OWO heads all line up the same.
Quality is the difference. Victor Reinz, Beck Arnley, and similar class of gaskets mfg's run the multilayer metal with rubber gaskets around the coolant passages. I've seen the Fel-pro are pressed paper, big loss of qulaity and difference from original style gasket.
Axel kain: (2014-10-03 12:39:45)
the lower intake is 30. using Victor Reinz gaskets I believe, as they are the metal with a plastic/rubber liner of the holes. like stock.
jaqattack02: (2014-10-03 13:31:14)
the lower intake is 30. using Victor Reinz gaskets I believe, as they are the metal with a plastic/rubber liner of the holes. like stock.
They were FelPro intake gaskets. Victor Reinz head gaskets. And yes, I'm running all VG30 parts besides the heads themselves.
Axel kain: (2014-10-03 13:44:36)
- and valve springs, cams…
jaqattack02: (2014-10-04 02:09:34)
- and valve springs, cams…
Yeah, but they don't have anything to do with how the pieces go back together.
300zxturboftw: (2014-10-06 15:46:42)
This is what I was referencing. All my air ports line up pretty well, but here's the drivers side injector hole:
[archived image: 20131007_211105_zps6a678ec5.jpg]
Here's passenger side:
[archived image: 20131007_211036_zps5d460ad2.jpg]
Talking very very small amounts to be machined, which I actually had done. Helped a tiny bit but still off. I know someone else mentioned they had the same issue. It really shouldn't effect things too much as the spray should be well in the cylinder before catching that edge.
Axel kain: (2014-10-06 17:40:48)
where's the gasket in that first picture though?
300zxturboftw: (2014-10-06 18:16:48)
Sorry…that's the same side. They line up with out the gasket showing how much material needed to be taken off to line up. Didn't make much sense considering it was like .050 or something ridiculous. Machined off .020 and it cuts in to the injector ports. Kind of confused as what to do next other than something custom…which is silly considering everything else that has to connect.
G-E: (2014-10-06 20:04:12)
As long as the gasket seals around the part you can't see, you can safely remove the visible part -- though I do realize this will be a challenge without pulling the head
les_joey_paul: (2014-10-06 20:33:10)
Could just make sure the valve is closed then drill it like it is, pull the LIM off and vacuum/blow out the shavings.
300zxturboftw: (2014-10-06 21:02:34)
We'll see if i have issues while tuning. I'm going to put some boost into the car on wednesday.
jaqattack02: (2014-10-07 00:08:20)
I honestly didn't even check that on mine, but it's running fine, so I'm not worried about it. If I take things apart again I'll take a look though.
got boost?: (2015-02-25 15:03:36)
You need the thinner style gasket.
300zxturboftw: (2015-02-25 15:49:17)
You need the thinner style gasket.
Nope, Already tried it.
nismopu: (2015-02-28 06:15:36)
I noticed this years ago. I even brought it up when I was making custom lower intake flanges, that kind of mis alignment also tells me that your ports don't match well either and you could be losing a few ponies. A miniscule amount but, definitely something funky going on. I am thinking the vg33 manifolds were cut less than the early 30 manifolds. It might be worth measuring the heights of your ports next time you have the LIM off and seeing where your parts currently are at, machined wise.
NissanEgg: (2015-02-28 19:06:03)
There is no difference in the heads between the 0W0 and 21V/52V/85E where the LIM mounts to the head. The difference is in the LIMs. Get the LIM gasket for which ever LIM you use.
It's possible he has a bad casting for his head, or he didn't use the correct torque sequence for bolting down the LIM which can easily cock/twist.