Forged Replacement Pistons for the LN3 - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-16-2006, 02:46 PM   #11
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The top ring on an L67 piston should be slightly lower than an L27 or LN3 to prevent chipping under high boost.
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Old 09-16-2006, 02:53 PM   #12
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Quote:
Originally Posted by willwren
The top ring on an L67 piston should be slightly lower than an L27 or LN3 to prevent chipping under high boost.
Interesting...

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Old 09-16-2006, 02:54 PM   #13
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Quote:
He'll never wind out that far. 5000-5500 is going to be tops for him. The Series 1 doesn't make any power up there. It'* all down low in the RPM band.
Isn't it function of cam and top end valvetrain? If he goes to the trouble of replacing pistons, other components should also be upgraded to compliment.
In for a penny, in for a pound.
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Old 09-16-2006, 06:32 PM   #14
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Quote:
Originally Posted by 2000SilverBullet
Quote:
He'll never wind out that far. 5000-5500 is going to be tops for him. The Series 1 doesn't make any power up there. It'* all down low in the RPM band.
Isn't it function of cam and top end valvetrain? If he goes to the trouble of replacing pistons, other components should also be upgraded to compliment.
In for a penny, in for a pound.
I wasn't planning on going into the valtrain and head issues in this thread, but they would be addressed in an overhaul situation. (Naturally, since it would be a bare block at this point, cam, heads, and other bits would be worked on while the block is being boiled out and over-bored.)

Not really thinking of trying to raise the rev limit on the motor, just how much it can take in it'* regular power band.
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Old 09-17-2006, 06:45 PM   #15
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maybee a S2 l67 swap is in order It could save you money actually and series 2 is a good motor with losts of sure fire proven forged internals
THis would also take care of the transmission issue that WILL arise
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Old 09-17-2006, 06:56 PM   #16
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Quote:
Originally Posted by 1337ssei
maybee a S2 l67 swap is in order It could save you money actually and series 2 is a good motor with losts of sure fire proven forged internals
THis would also take care of the transmission issue that WILL arise
BUT..... you first have to find a L67 and trans, then have the car down for 6-7 months to do the swap....then the electrical deal....what Curt is doing makes sense to me
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Old 09-17-2006, 08:12 PM   #17
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6-7 months? Are you a quadraplegic?

The swap is a very good option if you're determined to keep the body/chassis you own. In fact, it'* still the BEST option in that regard. And it can be done in a couple weekends.
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Old 09-17-2006, 09:03 PM   #18
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Quote:
Originally Posted by willwren
6-7 months? Are you a quadraplegic?

The swap is a very good option if you're determined to keep the body/chassis you own. In fact, it'* still the BEST option in that regard. And it can be done in a couple weekends.
LMAO..sometimes...i like to take my time with Wiring
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Old 09-18-2006, 12:03 AM   #19
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Quote:
Originally Posted by willwren
The swap is a very good option if you're determined to keep the body/chassis you own. In fact, it'* still the BEST option in that regard. And it can be done in a couple weekends.
This isn't about swapping entire stock powertrains. Lets try looking at it a different way. Somebody hands you a bare block & caps and says "Go build me a motor" What are the options for the parts that go inside the block...specificly the pistons choices and the associated parts that go into the rotating assembly.

I don't believe for a moment that the stock 3800 bottom end is indestructable. What I have to work with is two motors. An LN3 with a yet to be installed M62 blower and a Series II 3800 with an M90 blower (Yeah, I scored an M90 with TB and LIM...so much for having a N/A backup motor ) The LN3, by virtue of being in the car already is the first that will likely blow, hence the first in line for a rebuild when that happens. The car can run on the spare motor during the rebuild.

This may seem a bit odd to you all. No apologies offered since this approach has worked for me for years. My 87 Camaro has a 420cid motor I built in it currently. But also has a backup 350 motor ready to go in (and it'* been in the car more than once already.) I expect the same from the Bonneville, so while dicking around with one motor, I have a ready to use spare and a plan. Probably will pick up a spare transmission along the way too.
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Old 09-18-2006, 01:01 AM   #20
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remember the tranny...it wont hold for long under nos or a supercharger..
ITs different and it'll be cool to see how fast you can get it...you may have serious problems bolting up that m90
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