SC'ing my N/A Bonneville - Page 2 - 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 05-21-2007, 10:00 PM   #11
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You want my opinions on the top swap?

Some will say go for it. Others will tell you not to waste your time. For me, I used a low mileage L27 as the core replacement for my shot L67. So far, the build has held up well, and with the sole exception of chasing knock gremlins (my cat was the biggest contributor), it has been reliable. I will know much more when the trans install is complete and I can drive the car alot more than 1k a year.

If you plan to run only at or slightly above stock L67 levels, an induced L27, esp. one that has been well cared for, will hold up well I think. If you DO plan on going past stock L67 levels, I suggest going a few notches richer than normal. This will keep you from melting the pistons since they are not coated like the L67 pistons. Otherwise, stick with the L67 setup from the get-go.

Keep in mind I am not mentioning the HD trans. No matter if you have the L67 or TS'd L27, it'* a given you should have an HD trans
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Old 05-21-2007, 10:36 PM   #12
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Top swap on a non-HD trans? Forget it unless you have at least 2k to throw at the trans.
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