lowridns10

I am currently building a 5.3 for my S10, and have a couple of questions, my first one is obviously that cam is too big for my displacement, but how far would i have to take the 5.3 to get to the stock ls1 bore? And by doing this will i be ok runnin the TREX cam ?
Thanks

dhdenney

iTrader: (53)

Well, your bore in the 5.3 is about 3.78" and the bore in the LS1 is 3.9". So you'll have to get at least .12" out of an overbore. I don't know anything about the structure of the Gen3 motors but that much overbore on the older ones is HUGE. You can't really do it unless you have a Dart block. Considering the use of sleeves on the LS1, I would say you can't get much bore out of the 5.3 either. Just a guess though. I would try a stroker crank and not worry about the bore as much. Just my .02.

Taspeed

iTrader: (1)

Well, the problem with the 5.3 isn't so much cubes as it is bore size. the hole is so small that you start getting flow issues in the cylinder. I would think about a reverse split cam for the 5.3 and you will see better results. Now I have seen 5.3's bored to 3.90 bore and they worked...i would question as to how long it would work based on the individual block. I would definately have it sonic tested first. You will also have $$ issues finding off the shelf pistons for the 5.3 as i don't think anyone really makes anything but stock bore for them. My .02.

Rich

lowridns10

Awe, I guess i will probally go the split duration route, any idea on what a good cam would be, will be running a turbo 350 tranny, and the edelbrock carb intake.

quickWS6

I would go no bigger than a 227/224 on a 5.3.