Using heads from other VQ35s

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04-02-2006, 02:51 PM

sciff5

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Using heads from other VQ35s

Hey guys this may be a stupid question but if you have a VQ35 is there any reason why you wouldent be able to use freer flowing heads made for the G35 or 350z if you also use the 350z plenum?

04-02-2006, 03:04 PM

Glude

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I believe anyone with a 3.5 could use the heads from the 6th gen which people say are the heads from the pathfinder.

04-02-2006, 03:10 PM

SR20DEN

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Quote:

Originally Posted by sciff5

is there any reason why you wouldent be able to use freer flowing heads

You assume they are.

04-02-2006, 03:41 PM

Nismo3112

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You could.. But why would you want to?

Same part numbers.

5.5 gen VQ35's, 350Z = same part numbers

6 gen = different part number

R50 PF VQ35 = different part numbers from the two above.

04-02-2006, 07:25 PM

vsamoylov

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nismo heads

04-02-2006, 07:41 PM

Glude

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Quote:

Originally Posted by vsamoylov

nismo heads

Extremely expensive if I remember correctly, right??

04-02-2006, 08:04 PM

Nismo3112

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Anything Nismo = expensive lol.

10-19-2007, 10:15 AM

coinage

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sorry to bring up an old thread but what are the difference between the 5.5gen and the 6th gen heads? i read something about softer valve springs... would it be a good idea to swap in the springs from my 02 onto the newer heads if i want to cam the motor?

Matt

10-19-2007, 10:25 AM

NmexMAX

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If I was going to toss cams in, I would use JWT VS's.

10-19-2007, 10:39 AM

#10

coinage

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any other differences?

10-19-2007, 10:45 AM

#11

NmexMAX

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The only difference in A34 heads vs A33B heads is the VS's. No other differences exist. So, having said that, flow characteristics are not affected by that small difference.

10-19-2007, 11:08 AM

#12

coinage

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cool... thanks that all i needed to know

10-19-2007, 11:13 AM

#13

DandyMax

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Quote:

Originally Posted by NmexMAX

If I was going to toss cams in, I would use JWT VS's.

Even better, I'd use double shimmed HR springs, and HR retainers. And way cheaper too.

Wait, I already did that... with a heavier DEK valvetrain that still revs to 8k+ no problem.

Last edited by DandyMax; 10-19-2007 at 11:22 AM.

10-19-2007, 11:16 AM

#14

NmexMAX

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Quote:

Originally Posted by DandyMax

I'd use double shimmed HR springs, and HR retainers. Wait, I already did...

. . . . I was hoping you’d chime in with that because I didn’t feel like searching high and low for that post. But yes, my actual point was ‘I would not use A34 springs’.

10-19-2007, 11:37 AM

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nismology

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Quote:

Originally Posted by DandyMax

Even better, I'd use double shimmed HR springs, and HR retainers. And way cheaper too.

Wait, I already did that... with a heavier DEK valvetrain that still revs to 8k+ no problem.

Any particular advantage to using the HR/Revup retainers for his purposes? Just looks like they have a bit more mass on them according to SR20's images.

10-19-2007, 12:16 PM

#16

DandyMax

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Quote:

Originally Posted by nismology

Any particular advantage to using the HR/Revup retainers for his purposes? Just looks like they have a bit more mass on them according to SR20's images.

They do look a little stronger. And they're dirt cheap.

I don't recall off the top of my head what the HR retainer weight was (I can check my notes at home later), but I *think* they might have been about .75-1 gram lighter than the non-revup, and they're definitely several grams lighter than the DE/DEK.

10-19-2007, 02:11 PM

#17

KRRZ350

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& IINM they're NOT titanium FTW, or am I wrong here?

10-19-2007, 02:51 PM

#18

nismology

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Quote:

Originally Posted by DandyMax

They do look a little stronger. And they're dirt cheap.

Figured that much. I've had DaveB price 'em out for me. Was just wondering if it would be worth the expense (albeit small) for his setup is all.

Quote:

I don't recall off the top of my head what the HR retainer weight was (I can check my notes at home later), but I *think* they might have been about .75-1 gram lighter than the non-revup, and they're definitely several grams lighter than the DE/DEK.

Please do check again because that would be nuts if they were actually lighter.

Looked like they had more meat on them.

10-19-2007, 06:01 PM

#19

DandyMax

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Quote:

Originally Posted by nismology

Figured that much. I've had DaveB price 'em out for me. Was just wondering if it would be worth the expense (albeit small) for his setup is all.

If you're in there changing springs anyways...

Quote:

Originally Posted by nismology

Please do check again because that would be nuts if they were actually lighter.

Looked like they had more meat on them.

Well I checked and I was mistaken (darn lousy memory). They're about the same, or slightly heavier by a few tenths of a gram, which does make sense.

10-19-2007, 09:54 PM

#20

sciff5

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Quote:

Originally Posted by DandyMax

Even better, I'd use double shimmed HR springs, and HR retainers. And way cheaper too.

Wait, I already did that... with a heavier DEK valvetrain that still revs to 8k+ no problem.

So even if we used the HR Valve springs in our Vq35s and were able to raise the rev limit to 7500 or so, would the heads/ intake be able to support power at those levels?