L67 heads on a L36? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-02-2003, 12:14 AM   #1
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Default L67 heads on a L36?

Would getting a set of the L67 heads w/ the injectors on the top be a good performace option?? Would it throw the computer off w/ the injectors in a diffrent spot?
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Old 05-02-2003, 12:18 AM   #2
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Hmmm...i think that you'd be okay because they are both the Series 2 so everything should be uniform. This is kinda out of my knowledge..its a good idea. ..hopefully someone knows.
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Old 05-02-2003, 01:50 AM   #3
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I'm in the very process of finding this out! I've got a Series I 3800 NA engine & I'm buying a Series II 3800 NA to strip down. I'll keep all informed of my progress.
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Old 05-02-2003, 11:23 AM   #4
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You would have to block off the injector ports in the lower intake. Also, the L67 heads cannot be ported as deeply as L36 heads due to the injector placement. I don't think you'll get any performance add doing this. Now using L67 internals...that'* a different story. If you use L67 pistons, get the 9.4:1 compression or higher. I am running 10.4:1 compression as of right now and I can tell you it'* VERY noticeable. Your L36 runs at 9.4:1 and the L67 runs at 8.0:1; a lot of the GP'ers run the higher compression without any problem, even with the SC.

Al,
Don't use a balance shaft from an L67 if you are going to increase the compression. It'* not corrected for the higher run. The pistons are lighter, making the engine run like it has a heavy cam and it could damage the mains. I have an L36 in the shed to prove it. Thankfully I didn't get it installed before it happened.
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Old 05-02-2003, 06:11 PM   #5
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DeathRat awesome. keep me posted.

Quote:
Originally Posted by complinitor
You would have to block off the injector ports in the lower intake. Also, the L67 heads cannot be ported as deeply as L36 heads due to the injector placement. I don't think you'll get any performance add doing this. Now using L67 internals...that'* a different story. If you use L67 pistons, get the 9.4:1 compression or higher. I am running 10.4:1 compression as of right now and I can tell you it'* VERY noticeable. Your L36 runs at 9.4:1 and the L67 runs at 8.0:1; a lot of the GP'ers run the higher compression without any problem, even with the SC.
I was thinking about changing the pistons and rods to the L67 type when i get my engine rebuilt. Do i have to change anything else when i do this? Is there anything else i should put in that'* from a L67? Also, how do i change the compression, just by shaving off a certian amount of metal from the bottom of the heads? If that'* it, how much to achieve the right compression?
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Old 05-03-2003, 01:29 PM   #6
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If you are going to do this, I recommend you replace everything in the lower half of the engine...crank, bearings, rods, wristpins, pistons, rings, and all the little things like bolts , gaskets, etc. There are quite a few sites that deal with performance replacements.

Don't shave your heads on this motor. The tolerances are too tight. The compression increase is handled with a dished piston. I got some stock L67 pumpers and had my guys at the CNC shop do some work on them, so mine are custom, but I believe that 3800 performance carries a Diamond Racing Forged Pistons Kit. It'* pricey, but worth it if you are serious about your power band.

http://www.3800performance.com/vehic...ville_miva.htm
Click on Engine, then scroll down 16 items to the pistons.
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Old 05-08-2003, 05:29 AM   #7
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Don't even attempt it......too many things to change. Your money and performance would both benefit better from a good port and polish job on the heads, lower intake, and exhaust manifolds. Much cheaper, and better performance gain for the NA.

Get the heads, lower intake, and manifolds from the wrecker, have all the work done, then swap it all in a day. Sell your parts to the next guy. You'll spend half the money, and be much happier with the results. I have a link to a good do-it-yourself site for porting and polishing if you're interested in this.
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Old 05-08-2003, 11:50 PM   #8
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Quote:
Originally Posted by willwren
Don't even attempt it......too many things to change. Your money and performance would both benefit better from a good port and polish job on the heads, lower intake, and exhaust manifolds. Much cheaper, and better performance gain for the NA.

Get the heads, lower intake, and manifolds from the wrecker, have all the work done, then swap it all in a day. Sell your parts to the next guy. You'll spend half the money, and be much happier with the results. I have a link to a good do-it-yourself site for porting and polishing if you're interested in this.
'do it yourself'... I am extremely interested!
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Old 05-09-2003, 04:05 AM   #9
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Ok, you asked for it. Got this one from Hector AGES ago:

http://www.sa-motorsports.com/diyguide.shtm

(not a **** site....I SWEAR)
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Old 05-09-2003, 06:01 PM   #10
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nice. still a little down the line b/c of the sufficating cash flow but when i get the heads and the abrasion kit i will definatily take pics, and post results. Hopefully i can start to do this by the end of the summer, i'm kinda 3200 bills in the hole.

Well, thanks willwren!
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