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Old 06-18-2013, 12:36 AM   #1
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Default L36-L67 conversion

hey guys. after doing the headgaskets on a friends grand am i realized that its not a huge deal to take off the top end of a motor. my car currently has a lifter tick/ possibly a bent pushrod with how i drive it. so i was wondering what exactly would be involved after i install the heads manifold and */c from an l67? thanks alot guys
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Old 06-18-2013, 01:48 AM   #2
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I assume you'll have the usual culprits: a few oil changes, coolant, RTV, new gaskets, maintenance items, and whatever else you need for regular teardowns.

From the L67, you'll need pretty much everything from the heads up. Don't forget premium gas, L67-friendly spark plugs (not platinums), and the L67'* PCM. That will get you up and running, but with that added compression, a custom tune is very highly recommended.

A stock supercharged motor can turn a 4T65-E into mush. You only need a couple parts to change a 4T65-E into a 4T65E-HD, so that should be your next mod.
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Old 06-18-2013, 01:50 AM   #3
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will the new pcm add the boost gauge to my dic or will i have to buy a pod?
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Old 06-18-2013, 01:54 AM   #4
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Quote:
Originally Posted by eltatertoto View Post
will the new pcm add the boost gauge to my dic or will i have to buy a pod?
That I don't know for sure. If it were to work, you'd probably have to replace the wiring harnesses between the PCM and the dashboard, as well as the cluster itself, with the parts from the donor car.
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Old 06-18-2013, 05:52 AM   #5
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If your looking at just swapping the top parts, your in more trouble than you think. Yes, technically you can just move parts over to the L36 and call it an L67, but your not done yet. The L36 is a 9-1 compression engine vs the 8.5-1 L67. Serious tuning and scanning would be required to make the engine operate properly. It is possible and plug-n-play if you just dropped an regular L67 in and just swapped PCMs without tuning. But the donor PCM would still need to be programmed with the new VIN#.

And you would need to upgrade the trans to HD also.

I don't think Buick'* ever came with a boost gauge. Only the higher end SSEi Bonneville'* did.

In the long run, its much easier to just swap the engine and transmission at once.

Read this too...
https://www.gmforum.com/performance-...engine-279634/
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Old 06-18-2013, 12:34 PM   #6
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i know for sure the regal has the boost gauge on its DIC, im not 100% on the PA. with all thats involved and with how many miles my car has despite an all new suspension and countless other parts i think it would probably be smarter to just drive my car as is till i can afford the 00-05 impala ss like i want. laurens N/A impala has more balls than my car would have with a */C because its so much lighter.
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Old 06-18-2013, 03:02 PM   #7
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unless you are going to mod it i cant see why you would want the l67. the bonniville ssei is 7.4 0-60. i did a run on my monte with my gtech with all my audio crap and normal junk in it and still got 7.5. and i get 50% better mileage than those cars. wiki lists impala weight as 3500 and ssei as 3700
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Old 06-20-2013, 01:33 AM   #8
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my car is also 3700. i dunno what the difference is, but laurens car absolutely hauls the mail compared to mine. its gotta be more than a 200lb difference or differently geared transmissions, but considering the fact all the shift points are the same as my car i really doubt it. second gear engages at 47mph at full throttle and O/D engages at 45 mph while at 1/4 or blow throttle. it also is worth noting laurens car gets about 5-6 mpg better than mine on the original plugs at 150k miles. avg speed is 32mph according to the roof DIC

either Wikipedia is wrong or there is magic in laurens engine. lol
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Old 06-20-2013, 05:44 AM   #9
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Different final drive ratio makes a difference.
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Old 06-20-2013, 08:34 AM   #10
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i imagine the ratio is the same too if they shift and cruise the same. finding performance data about a buick isnt very easy. i havent driven a 3800 impala but my moms with the 3400 does feel lighter than my bonnie but the acceleration is not much different.
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