INTERNAL ENGINE MODIFICATIONS Valvetrain |Heads | Strokers | Design | Assembly

4.8 turned into a 5.3???? I need help!!!!

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Old 05-20-2007, 10:11 PM
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Originally Posted by LVSTOGOFST2002
are you positive on that? from past research i'd like to say you're wrong. But, if you're not, i'd like some info to back it please. My buddy is actually getting ready to do this right now. I'd like to help save him from making a mistake.
I'll back him up on it. The 4.8 use a shorter stroke crank and longer rod to make up the difference. They also use a flattop piston to make up the compression difference, but have the same pin location as the dished 5.3 pistons.
Old 05-20-2007, 10:26 PM
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This is the CORRECTED version of the chart you where probable referring to. It was INCORRECT on the rod length of the 5.3.


Last edited by kbracing96; 05-20-2007 at 10:56 PM.
Old 05-20-2007, 10:32 PM
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that was the chart i had seen in the past..... i see the correction.

Shouldn't the rod to stroke ratio be corrected too then?
Old 05-20-2007, 10:51 PM
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Originally Posted by LVSTOGOFST2002
that was the chart i had seen in the past..... i see the correction.

Shouldn't the rod to stroke ratio be corrected too then?
Yep I'll fix that too


Edit: Ok, should be all fixed up and accurate to the best of my knowledge, lol.

Last edited by kbracing96; 05-20-2007 at 10:58 PM.
Old 05-21-2007, 01:45 AM
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the chart looks good to me.
now if you can lay your hands on a set of LS6 heads,
to go with iron block 5.7 you will love your lumpy cam even more.
Old 05-21-2007, 09:03 AM
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Putting an LS6 intake on a stock truck motor can get expensive, besides buying the intake. Are you sure that's what you're looking for. Your truck intake will work great.
Old 05-21-2007, 01:45 PM
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Just called the machine shop and he said $180 to punch it out. Yes I want to run a ls6 intake on it for sure and I will probably run it backwards too. I found a 5.3 crank for a $100 bucks and do I need to get stock LS1 pictons and rods and run arp bolts in everything? And you guys would get some 243 heads? What would be a good cam for this setup, I wan't a big lope since this is no daily driver and what stall will I need with the cam?
Thanks guys
Old 05-21-2007, 03:16 PM
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run it backwards??????? wtf are you talking about?
Old 05-21-2007, 08:03 PM
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Originally Posted by LVSTOGOFST2002
run it backwards??????? wtf are you talking about?
You can run the intake backwards on these motors. Turn the intake 180 degrees and bolt it right up.
Old 05-21-2007, 08:06 PM
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Originally Posted by jkade72
You can run the intake backwards on these motors. Turn the intake 180 degrees and bolt it right up.
Check it out. That is my dads vette and it has a 6.0
http://67-72chevytrucks.com/vboard/s...d.php?t=234761


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