Hello every one!! I am new here I have a question and need some professional opinions!! I just traded my 96 Z28 for an 04 Grand Prix GTP Comp G. The guy that I traded to put a L26 bottom end only in place of the L32 bottom end due to a burned piston. I know the L26 has flat top pistons and the L32 has dish. I have to pull the heads he told me it had a warped or cracked head it was getting coolant in #4 cylinder. Will I have any issues with compression or issues with it blowing gaskets? If the heads are cracked or warped what would you guys suggest I do. When I get the heads fixed and back on will I have to have my car tuned. I am in need of some good information if some one could HELP ME IT WOULD REALLY HELP ME OUT.. THANKS
GTP CompG with L26 Bottom HELP!!!!!
- Thread starter jewell83
- Start date
machinegunsquid
New member
Once you pull the heads take them to a good machine shop and have them check them out. They should be able to deck the heads and get them flat if they aren't too warped.
Also, once the heads are off, clean the block really well then put a flat edge on it to make sure the block isnt warped.
If you can get the heads back in spec and the block is okay, no reason for it to leak as long as you reinstall everything correctly.
Also, once the heads are off, clean the block really well then put a flat edge on it to make sure the block isnt warped.
If you can get the heads back in spec and the block is okay, no reason for it to leak as long as you reinstall everything correctly.
Slick2500
New member
I don't remember the piston tops being any different. The only thing I think is different is the compression ratio. The tops of the pistons look exactly the same on my L67 as they do on my L26.
If its still on the stock pulley I would run a step colder plug and try to get a downpipe. And run the highest octane gas you can.
If its still on the stock pulley I would run a step colder plug and try to get a downpipe. And run the highest octane gas you can.
Scottydoggs
Killa Bee
the block is fine. its a top swap basically, it gets done all the time.
as long as your tearing into it, this would be a good time to add headers. a top swap needs to exhale a bit better. they will make the engine happier. the old block was low compression, this new block is hi compression.
sounds like a good trade too.
as long as your tearing into it, this would be a good time to add headers. a top swap needs to exhale a bit better. they will make the engine happier. the old block was low compression, this new block is hi compression.
sounds like a good trade too.
Thanks Im going to look for some headers online sounds like a good idea. That's great I was super worried I would end up pulling it out and starting from scratch. That sure gives me some peace of mind LOL. Yeah the GP is really nice I have had z28s all my life I think I am ready for something new. THANKYOU FOR THE REPLYS GUYS!!!
crbquist
New member
I'd run an l67 or l32 over an l26 any day. Not sure what is so special about an l26... Just a cheaper solution when replacing a 3800.
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tomtom123
New member
^ The difference is compression ratio. The L67 and L32 is like, (someone will probably have more accurate numbers), 8.5:1 compression ratio whereas the L26 is something like 9.0:1? The higher compression gives you more power. The L26 stock will lose to an L67 or L32 that's stock, but if you took the L26 bottom end, with the higher compression ratio, and top swapped your blower on top, you how have a high compression ratio'd supercharged monster. A topswapped L26 will put down more power than a lightly modded L67. That's why a lot of people like to topswap their L67's/L32's onto the L26 bottom end.
crbquist
New member
I am well aware of the different compression ratios, however I disagree with the power differences. Sure an L26 will make slightly more power than an L32/67 with a stock pulley given the tune is good and there is no KR. When you get down to the 3.0 pulley range on an L32/67 running safety, you'll be in the 3.4 pulley range with an L26 (unless running e85), hence making less power even with higher compression. Bottom line is the supercharged bottom ends can handle more boost and take more abuse than the weaker rodded N/A bottom ends. Plenty of guys have made great power with the L26, and many of them have blown up in doing so... I'd much rather take reliability over trying to squeeze every last bit of hp out of a ticking time bomb.
sseilmnop
LaBarge Supercharged
crbquist
New member
I know people have run them with great success and made good power. I just wouldn't trust one on a high hp build over an L67 or 32. I've heard of too many horror stories. If I somehow managed to blow my original L67 I'd probably look for another L67 or 32 over an L26 or 36. The supercharged bottoms are much more KR forgiving than the NA bottoms. Just my opinion and preference.
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sseilmnop
LaBarge Supercharged
He has a top swap (bottom swap) and maybe adding headers.
This is not a high HP build.
It's a get it running build.
crbquist
New member
I know that, I meant in general. Regardless, I'd still opt for an l67 or 32. Just my cup of tea..
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sseilmnop
LaBarge Supercharged
You are recommending throwing away his current motor and starting over with used L67 L32 motor. Have you looked and priced one lately?
They want $1,500 for one with 150,000 miles.