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L32 heads on L67

97PAGTP

97PAGTP

New member
Curious if stock L32 heads flow better than stock L67. And would they bolt right onto a L67? Same with L32 injectors and L32 fuel rails.

I am new the these cars and I'm just tryin to learn as much about as possible.

Thanks in advance for your help.
 


The L32 is the newer version of the L67........................I don't know what you're talking about with lower compression.........

To the OP, some say the L32 uses larger valves, but in the tests I've seen at other sites, the difference, if any, is so minuscule that it is a marginal difference at best.

Unless there is something wrong with your L67 heads, I'd just do a mild port job and gasket match those!
 
Both use 1.52" exhaust valves and the same head casting #4781. The L67 uses a 1.8" intake valve vs the L32 uses a 1.83" intake valve. L32 bolts onto the L67 block, but not worth it unless you're running serious mods because as copgtp said, the difference is minuscule. If there's nothing wrong with your L67 heads, put your money elsewhere.
 
Since no one has yet addressed the other questions, you cannot use l32 injectors or fuel rail with your car. The injectors are actually smaller because of a higher fuel pressure due to a returnless system.
 


matt5112 said:
only in vettes...
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who do i listen to? ive had so many ppl tell me so many different things, my head is spinning no one can agree on anything!!!

Differences between a L32 3800 and a L67 3800
In 2004 GM updated the pontiac grand prix with a new exterior and interior. there were also many changes made to the supercharged engine now dubbed the L32 or series 3 supercharged 3800. This is going to touch on a few of these changes.

1. A new more efficient m90 supercharger was installed. This is the 5th generation of this supercharger and it featured a larger opening similar in design to that of a ported gen 3 m90. It also featured a new lobe design and coating that allowed for increased efficiency. The lower intake manifold is also adapted to match the gen 5 and has a larger opening. It is also fitted with an electronic throttle. It is possible to swap the newer unit on to an orginally equipped gen 3 car. however the altenator and and altenator tensioner housing needs to be swapped. if you choose to keep your orginal altenator a spacer is needed to be made so the power lug of the altenator doesn't interfere with the blower housing. This is a bolt on application for an older car. however a stock gen 5 m90 is equivelent to a fully ported inlet and outlet gen 3. There haven't been many gains made yet with a porting a gen 5.

2. The series 3 uses a sand cast front cover. This is because the orginal tooling wore out for the front cover and converting the exisiting molds over to this method was the most cost effective move. This is a double edged sword. In stock form in terms of oiling it is a serious down grade for the oiling system. the passages are very rough and have lots of casting junk in them. were as a series 2 cover is much smoother and better flowing. The benifit of the series 3 cover is that it is much thicker then a series cover in the passage. This allows for major porting of the oiling passages to improve flow. So on a modded engine with a heavily ported series 3 cover you will have the best oil flow possible through the front cover.

3. The series 3 is fitted with a aluminum oil pan. Some early L32's still had the stamped steel pan.

4. The series 3 is fitted with powdered metal connecting rods. These are not forged rods but a better form of casting which in terms makes them stronger. They are an upgrade from l67 rods. Also in the parts catalog the l67 rods have been superceded by the L32 rods. Not all series 3 engines have these. some very early l32's still had left over l67 rods.

5. The L32 is fitted with sodium filled exhaust valves. These do not improve flow they simply weigh less and can free up a few horsepower.

6. The u bend has been deleted.

7. Comp G models are fitted with a tap shift version of the 4t65e hd. to allow manual shifting features via steering wheel paddles.
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the new ftv6 l67/l32 super faq

Also wiki and my tuner both said that the heads flow a little better cuz of bigger valves but in here someone said you get less compression and then only 1 valve was changed. IM SO CONFUSED

Series III
The Series III motors include many changes. The upper intake manifold is now aluminum on the naturally aspirated models. Intake ports are mildy improved, 1.83" intake valves (instead of 1.80" as on Series II) and 1.52" exhaust valves were introduced in 2003 engines, just before switching to Series III.

L32 Supercharged
The L32 is a supercharged Series III. Introduced in 2004, the main differences between the L67 and the L32 is the L32's electronic throttle control, slightly improved cylinder head design, and updated Eaton supercharger, the Generation 5 M90. Power output is up to 260 hp (194 kW) in the Grand Prix GTP.
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Buick V6 engine - Wikipedia, the free encyclopedia
 


WOW, that is a lot of helpful information. So...just porting the L67 M90 is equivalent to a Gen V. Glad I read that before wasting money on a Gen V. Also, the minor increase in heads with the L32 isn't worth the money either. I'll stick with my L67 stuff and get the tools out and port/polish them.

Thank you!
 
Also wiki and my tuner both said that the heads flow a little better
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Well then obviously it's true if it's on wikipedia............

The heads do flow a little better, we said that. But the difference better the two heads is so small it's not worth the time / money it takes to do the swap.

And the sodium filled valves thing is a misconception that has been floating around for quite a while.


So...just porting the L67 M90 is equivalent to a Gen V. Glad I read that before wasting money on a Gen V.
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OMG soooooooooooooooo much mis-information that is being given out in this thread!!!! A Gen V blower is vastly better than a Gen III (L67) blower. The best ported L67 blower doesn't move as much air or stay as cool as the stock Gen V casting.
 
I saw that on fullthrottlev6.com about the sodium filled valves too and was wondering if it was true. Guess I should weigh one of my L32 valves and one of my L67 to see if the L32 is lighter. Also, if it does have the sodium filled exhaust valves, besides being lighter, the sodium is also to aid transferring the heat away from the valve head.
 
97PAGTP said:
WOW, that is a lot of helpful information. So...just porting the L67 M90 is equivalent to a Gen V. Glad I read that before wasting money on a Gen V. Also, the minor increase in heads with the L32 isn't worth the money either. I'll stick with my L67 stuff and get the tools out and port/polish them.

Thank you!
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A fully ported and polished GenIII is still not as efficient as a stock GenV.
 


copgtp said:
Well then obviously it's true if it's on wikipedia............

The heads do flow a little better, we said that. But the difference better the two heads is so small it's not worth the time / money it takes to do the swap.

And the sodium filled valves thing is a misconception that has been floating around for quite a while.




OMG soooooooooooooooo much mis-information that is being given out in this thread!!!! A Gen V blower is vastly better than a Gen III (L67) blower. The best ported L67 blower doesn't move as much air or stay as cool as the stock Gen V casting.
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my tuner said he weighed the valves and they were lighter and bigger. not worth a swap it you were just doing that, but an advantage over l67 heads regardless. there was no reason for you to be sarcastic to me
 
GenVI805 said:
my tuner said he weighed the valves and they were lighter and bigger. not worth a swap it you were just doing that, but an advantage over l67 heads regardless. there was no reason for you to be sarcastic to me
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You asked a question, you got a response, and then you shot back and said "well look I got different answers elsewhere". If you were happy with the answers you got from your "tuner" and wikipedia, than don't ask here!

Go let your "tuner" weigh more valves......................
 
copgtp said:
You asked a question, you got a response, and then you shot back and said "well look I got different answers elsewhere". If you were happy with the answers you got from your "tuner" and wikipedia, than don't ask here!

Go let your "tuner" weigh more valves......................
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im sorry if you had a bad day sir, i hope it gets better.
 
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