402 Vs. 408
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From: IN A VAN, DOWN BY THE RIVER!
402 Vs. 408 Ok heres the deal. im a collage student, so im not rich 
. Im getting an Lq9 so i can build me another motor for the t/a. what i want to know is, is it worth it to bore it .030 over for the 6 extra c.i.'s or not. im looking for about 450 N/A rwhp.
. Im getting an Lq9 so i can build me another motor for the t/a. what i want to know is, is it worth it to bore it .030 over for the 6 extra c.i.'s or not. im looking for about 450 N/A rwhp. Thread Starter
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From: IN A VAN, DOWN BY THE RIVER!
Originally Posted by 1_bad_TA
you can get that with the right combo of parts and tune from a stock bottom end LS1. I'm gonna have to say no to either.
Originally Posted by 1_bad_TA
you can get that with the right combo of parts and tune from a stock bottom end LS1. I'm gonna have to say no to either.
i think i would go with the bigger cubes
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Originally Posted by blksheep
450 from a 346ci and 450 from a 402/408ci are alot different.
i think i would go with the bigger cubes
i think i would go with the bigger cubes
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OK, is the block new or used? The reason to bore .030 is to give you a new perfectly round cylinder to install your new pistons and rings. I am not sure if GM uses tq plates when they hone the cast iron blocks or not, if not I would suggest getting it bored and honed for that reason alone. If they do and it has a fresh bore, then leave it the standard bore if you can get aftermarket pistons in standard bore size. As for the money, getting a block bored and honed is not that much of an expense, the trick will be finding a shop that takes pride in their work and has a TQ plate for the new LSX blocks. I would not expect the bore and hone with plate and fine finish to be over $200.00-$250.00.
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Won't make ten cents worth of difference. Any engine builder is gonna bore the block anyway. Pistons will cost the same as well. Either should cost the same.
