How much hp out of N/A LS!?
. 500rwhp is fairly attainable at 6800 rpms. You still need to change those valve springs every 15-20k though.Shops like Vengeance builds em' all the time. Anything with good drivability and 450rwhp, your doing something right.
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A solid 450 rwhp N/A 346 should last quite a long time if you tune it right, change the oil and in general keep it well maintained.
I don't know about 550+ rwhp but LG Motorsports did grease up a g5xx cam and shove it into a lil 346 and ended up making 530 rwhp 484 rwtq !!! I thought that was pretty wicked. Just barely streetable, but more at home on the track.





