5.3l pistons in a 4.8l?
01-09-2009, 02:05 PM
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5.3l pistons in a 4.8l?
I would like to build a Sy/Ty clone with the lsx motor and came across a 4.8l for next to nothing. After a little research i found that the 5.3 and 4.8 are the same except for the the 5.3 has a longer stroke so the pistons are dished to lower compression. So i was wondering if they would in the 4.8? I would like to lower the compression so the it would be easier to turbo charge and not spend a fortune to do it. I only want 450-500 horse so the stock parts from what i have read should hold up. It will also be backed with the 4l80e and a awd transfer case. With the 35/65 split (50/50 slipping) the stock drive system should also be fine for a while also.
01-09-2009, 02:38 PM
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In this article it said that they have a 71cc http://www.enginebuildermag.com/Arti...all_block.aspx (you'll have to scroll down a little). I have read different threads and they all very. Could i use the 6.0l heads they are suppose to have 71cc? Would this drop compression too much?
01-09-2009, 11:10 PM
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As would I. The stock 4.8L sits at 9.5:1 compression from the factory. That's perfect for 8-10psi, just make sure the intercooler does it's job. However, in an AWD vehicle, I would rather start with the 5.3L. They are the same cost, if not cheaper, from most junkyards than the 4.8L and will make 10% more torque everywhere.
01-10-2009, 03:04 PM
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What size turbo were you running to get that?
What was the redline at and dose it have the same redline as the 5.3.
I know that the 5.3 would put out a few more ponies but i can get a 4.8l for $200 and the 6.0 head run $200-300. So for $500 it wouldn't cost me to much. If i could run the 6.0 heads to lower compression to 8-8:5 i could turn the boost up a bit.
What was the redline at and dose it have the same redline as the 5.3.
I know that the 5.3 would put out a few more ponies but i can get a 4.8l for $200 and the 6.0 head run $200-300. So for $500 it wouldn't cost me to much. If i could run the 6.0 heads to lower compression to 8-8:5 i could turn the boost up a bit.