3.0 vs 3.2 heads

[VortecGT]

Is there a difference? I thought I heard once that the cam chain tensioners were different? Will they work on a 3.2?

 

[yamahaSHO]

www.shotimes.com

 

[bubba]

everything is the same! but the cams! are different.....and keeping the 3.2 heads during a 3.2 swap...You have to cut the 3.2 head!

 

[zak]

Communication between the intake ports is different.

 

[jonheese]

The 3.2L timing belt setup is different from the 3.0L unit, but the chain tensioners are the same. The cam lobe profiles on the intake cams are different (more lift/duration in the 3.0L intake cams). As Bubba mentioned, some minor bits of the outside castings are different.

Other than that, I know of no other differences.

Communication between the intake ports is different.

I'm not sure what you mean by this...

I have a 3.0 and a 3.2 on stands in my garage, and I just went and inspected the intake ports and I can see no differences between them. Here are some pics I just took:

3.2L intake ports

3.0L intake ports

Besides the copious amount of carbon on the 3.0L ports (the engine has almost 300k miles on it), they're practically identical to my eye...

 

[zak]

Jon - Were those late 3.0 heads (94/95)? The side of the opening between the two ports varied, and was larger (IIRC) on the 3.2's. The 3.0's might have adopted this in the final years of (low rate) production.

This might have been done to improve injector spray pattern for emissions reasons, but that is conjecture on my part.

zak

 

[jonheese]

Jon - Were those late 3.0 heads (94/95)? The side of the opening between the two ports varied, and was larger (IIRC) on the 3.2's. The 3.0's might have adopted this in the final years of (low rate) production.

This might have been done to improve injector spray pattern for emissions reasons, but that is conjecture on my part.

zak

Nope. It's the original head from my '90. The 3.2L is a '93.

 

[AREA 91]

The coil pack mounting is different. It's slightly tilted. The intake cams on the 3.2 are smaller.

I have seen no differences between the 3.0 and 3.2 heads as far as the ports and cumbustion chambers.

 

[jonheese]

Aha, that's right, I forgot about that. Although I suppose that might fall under "minor bits of the outside castings".

 

[Brett]

The 3.2L timing belt setup is different from the 3.0L unit, but the chain tensioners are the same. The cam lobe profiles on the intake cams are different (more lift/duration in the 3.0L intake cams). As Bubba mentioned, some minor bits of the outside castings are different.

Other than that, I know of no other differences.


I'm not sure what you mean by this...

I have a 3.0 and a 3.2 on stands in my garage, and I just went and inspected the intake ports and I can see no differences between them. Here are some pics I just took:

3.2L intake ports

3.0L intake ports

Besides the copious amount of carbon on the 3.0L ports (the engine has almost 300k miles on it), they're practically identical to my eye...

I have 3.2 runners on my 3.0 if there is a difference it didnt affect fitment.

 

[jonheese]

Just to clarify, by "runners", you mean the "snakes" right? I don't think anyone is saying that the runners are different between the 3.0L and 3.2L intakes. After all, you're talking about the intake, not the head, and I think this discussion is about the head differences.