adding power to an L27 - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 08-31-2006, 02:13 PM   #31
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When I had my heads milled, I think it was only $20-$30. Not bad at all. But yes, it is a precision job that should only be done by a reputable machine shop.

Before we get too far into this, I'm only suggesting these modifications in theory. If you actually want to do these things, make sure you know what you're doing, or have someone help you that knows what they're doing. Cam and head swaps are not for the average joe, and there are a lot of things that could be screwed up. Make sure you do your homework on all this stuff.

For instance, find out (if you can) the piston-to-valve clearances on a stock L27, and make sure there won't be any issues with shaving some material off the heads. See if you can find other people who have done similar modifications. I would suggest looking on some Australian websites. As far as I know, the Aussies have had an extensive Series 1 aftermarket a lot longer than we have.
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Old 08-31-2006, 02:58 PM   #32
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Quote:
Originally Posted by big_news_1
When I had my heads milled, I think it was only $20-$30. Not bad at all. But yes, it is a precision job that should only be done by a reputable machine shop.

Before we get too far into this, I'm only suggesting these modifications in theory. If you actually want to do these things, make sure you know what you're doing, or have someone help you that knows what they're doing. Cam and head swaps are not for the average joe, and there are a lot of things that could be screwed up. Make sure you do your homework on all this stuff.

For instance, find out (if you can) the piston-to-valve clearances on a stock L27, and make sure there won't be any issues with shaving some material off the heads. See if you can find other people who have done similar modifications. I would suggest looking on some Australian websites. As far as I know, the Aussies have had an extensive Series 1 aftermarket a lot longer than we have.
yes i know, i just needed to be pointed in the right direction. I have alot of reading to do.
I have taken note off everything.
Thanks for suggesting the australian sites.

im still going to begin with the simpler stuff first

thanks a bunch guys,
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Old 08-31-2006, 04:00 PM   #33
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Curious to know how everything goes. Make sure to keep us posted with details. It'* nice to see someone else working with the L27. Gook Luck
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Old 08-31-2006, 04:12 PM   #34
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thanks for your support, and everyones help.

i will post everything here, i will just keep on bumping this thread up.

i am currently looking for another half reliable used car- to begin my bonnie'*
serious modding life..
but guys its going to take me time..
i am freakin excited.
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Old 08-31-2006, 04:27 PM   #35
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If and when you go through with this, make sure you do baseline runs on both a dyno and at the strip, so that others can see what exactly is to be gained from this, and if it'* really worth it to them.
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Old 08-31-2006, 08:33 PM   #36
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If your going to the trouble to change to 3.06 gearing why don't you change to 3.33 gearing for $17 more?
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Old 08-31-2006, 10:49 PM   #37
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Quote:
Originally Posted by Puddy46
If and when you go through with this, make sure you do baseline runs on both a dyno and at the strip, so that others can see what exactly is to be gained from this, and if it'* really worth it to them.
yeah i'll make a video or plenty.. dont know about dyno runs though..

Quote:
Originally Posted by llBlazin_llLo
your going to the trouble to change to 3.06 gearing why don't you change to 3.33 gearing for $17 more?
it had come to my mind before.. but i am nowhere near there yet.
just gimme time i'll figure it out.

if the ratio is increased i need a diff with more teeth?
what do you suggest?

im also going to do research on the specs of other cars that had the L27s combo
maybe i can use something.
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Old 08-31-2006, 11:00 PM   #38
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Quote:
Originally Posted by 94BonnieSE

im also going to do research on the specs of other cars that had the L27s combo
maybe i can use something.
no Bonnes used that ratio with te L27, and you will run out of breath too quick..... i would not do a 3.33 unless you just want stop light to stop light racing, and that is about it....the L27 dosent make the power up high, and the 3.33 just revves too fast
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Old 08-31-2006, 11:18 PM   #39
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Quote:
Originally Posted by 1993 SLE
no Bonnes used that ratio with te L27, and you will run out of breath too quick..... i would not do a 3.33 unless you just want stop light to stop light racing, and that is about it....the L27 dosent make the power up high, and the 3.33 just revves too fast
thanks for the info. yeah i understand what you mean 100%, man im learning enough believe it or not.im doing searches also on 3800pro.. noone bothers with the l27 too much.
I guess it would be up to me to decide once i have all the info and skill i need- to proceed.. even though the more i read on it.. the more i think its a "shop thing".
but dont know how much would this go for at a shop?
let'* say the 3.06 gearing plus some goodies on the trans. to make it strong and fun??

thaks once again to everyone for their suggestions an input.. everything helps man.

EDIT: i am now looking for a highflow cat... anyone have any suggestions or part #'*.. i have a flomaster muffler already.
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Old 09-01-2006, 11:13 AM   #40
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For the high-flow cat go to performancepeddler.com They have a make, year, and model look up. They have some of the best prices on the net and free shipping. And if you enter in the coupon EBAYROCKS when asked you'll get an even better deal
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