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Series III heads on series II motor

Dadkota

Dadkota

New member
I'm just curious of this, consider SC cars only. I know the Series III heads have bigger valves and breath a bit better. So can you switch the Series III heads on to a Series II motor with little/no machine work?
 


Yup, they don't require anything special, your good to go.


Edit: The difference in valve size is very small, you likely won't notice any gains just from that.
 
Would it need a tune on the dyno afterward to compensate for the larger valves? Or is it just bolt up and go?
 
Any gains right off the bat, or does it just open up more potential? Not looking to swap as a must but I might consider if I see a Series III gtp in a junk yard haha
 
Its hard to say, I've got series 3 heads on my 98, but I couldn't tell you the difference, I did a full cammed build as I did it.I'm guessing you wouldn't even tell the difference, we're talking minimal valve difference.
 


You won't notice ANYTHING.

If anything, put headers on it while the heads are off.

Then you'll notice some gains.
 
I put ported L32 heads and an XP cam on my 2001 gtp and it made more power. I would never consider putting stock unmodified L32 heads on a car without having them ported with a valve job and at least 90 lb valve springs, and just doing heads without a cam or high ratio rockers makes no sense.
 
SgtMarshal said:
I put ported L32 heads and an XP cam on my 2001 gtp and it made more power. I would never consider putting stock unmodified L32 heads on a car without having them ported with a valve job and at least 90 lb valve springs, and just doing heads without a cam or high ratio rockers makes no sense.
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It made more power because of the cam.

The point is if you're just swapping heads, then there is no gains that you'll notice on the butt dyno. And if you do then your old heads had a mechanical issue.
 
blueguy said:
It made more power because of the cam.

The point is if you're just swapping heads, then there is no gains that you'll notice on the butt dyno. And if you do then your old heads had a mechanical issue.
Click to expand...

I understand that, I just wanted to make an illustration of why someone would swap heads. ported heads support higher levels of power.
 


if the op did find a set of good L32 heads at the junkyard and the price was right, they would probably be worth buying, but only to port and install in conjunction with a cam. is this horse dead yet?
 
dead-horse.gif
 
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