Thread: Series III heads on series II motor

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  1. #1 Series III heads on series II motor 
    GT Level Member Dadkota's Avatar
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    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?
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  2. #2 Re: Series III heads on series II motor 
    Grocery Getter x2 goldgp's Avatar
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    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.
    1998 GTP Mods: Getrag 5 speed ,balanced bottom end,ARP hardware,L32 rods,Federal pistons .20 over,XP Cammed,Double roller,130# springs,and 3.4 Gen V,SSC springs,GMPP sways, C5 calipers,12 inch brakes.2000 Grand Prix SE 3.8 Mods: GT dual exaust,plog,downpipe,Transgo Shift kit,1.9 yella terra rr,strut braces,gmpp kit.Both noob tuned with HP Tuner
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  3. #3 Re: Series III heads on series II motor 
    GT Level Member Dadkota's Avatar
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    Would it need a tune on the dyno afterward to compensate for the larger valves? Or is it just bolt up and go?
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  4. #4 Re: Series III heads on series II motor 
    Grocery Getter x2 goldgp's Avatar
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    No tune, just bolt up, not really worth it if that's the whole reason for the swap tho.
    1998 GTP Mods: Getrag 5 speed ,balanced bottom end,ARP hardware,L32 rods,Federal pistons .20 over,XP Cammed,Double roller,130# springs,and 3.4 Gen V,SSC springs,GMPP sways, C5 calipers,12 inch brakes.2000 Grand Prix SE 3.8 Mods: GT dual exaust,plog,downpipe,Transgo Shift kit,1.9 yella terra rr,strut braces,gmpp kit.Both noob tuned with HP Tuner
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  5. #5 Re: Series III heads on series II motor 
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    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
    '01 GP GTP- Intake, Plog, 3" DP and Exhaust, DHP tuned by me, GMPP sway bars, 3.5 MPS, cold plugs and tstat
    -180,000 miles and climbing
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  6. #6 Re: Series III heads on series II motor 
    Grocery Getter x2 goldgp's Avatar
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    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.
    1998 GTP Mods: Getrag 5 speed ,balanced bottom end,ARP hardware,L32 rods,Federal pistons .20 over,XP Cammed,Double roller,130# springs,and 3.4 Gen V,SSC springs,GMPP sways, C5 calipers,12 inch brakes.2000 Grand Prix SE 3.8 Mods: GT dual exaust,plog,downpipe,Transgo Shift kit,1.9 yella terra rr,strut braces,gmpp kit.Both noob tuned with HP Tuner
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  7. #7 Re: Series III heads on series II motor 
    The Blue One blueguy's Avatar
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    You won't notice ANYTHING.

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

    Then you'll notice some gains.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
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    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  8. #8 Re: Series III heads on series II motor 
    GrandPrix Junkie SgtMarshal's Avatar
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    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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  9. #9 Re: Series III heads on series II motor 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by SgtMarshal View Post
    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.
    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.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  10. #10 Re: Series III heads on series II motor 
    GrandPrix Junkie SgtMarshal's Avatar
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    Quote Originally Posted by blueguy View Post
    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.
    I understand that, I just wanted to make an illustration of why someone would swap heads. ported heads support higher levels of power.
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  11. #11 Re: Series III heads on series II motor 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by SgtMarshal View Post
    I understand that, I just wanted to make an illustration of why someone would swap heads. ported heads support higher levels of power.
    I'd only swap heads if they were hogged out.

    Apparently OP is swapping stock for stock.

    Sooooo, yea.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  12. #12 Re: Series III heads on series II motor 
    GrandPrix Junkie SgtMarshal's Avatar
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    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?
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  13. #13 Re: Series III heads on series II motor 
    The Blue One blueguy's Avatar
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    I don't know, you keep beating it
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
    '99 Chevrolet Silverado Classic Z71 4x4 - K&N Intake/Gibson Exhaust #TRUCKTHINGS
    '12 Buick Regal Turbo - ZZP CAI/20% Tint/HID's
    '89 Ford Mustang LX Notchback - LM7 5.3, 4L80, 9", HX40
    '04 Chevrolet Corvette MRM A4/LS1 - TSP LT's, 3"O/R X, AFE S2 CAI
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  14. #14 Re: Series III heads on series II motor 
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    im a cookie again yay me
    Quote Originally Posted by Bio248 View Post
    please learn to forum better.
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  15. #15 Re: Series III heads on series II motor 
    GrandPrix Junkie SgtMarshal's Avatar
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    nice
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