i want to build up a 4.8
01-14-2008, 11:33 AM
#2
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Dang, Biggin, that's kind of a paucity of information there, don't you think? Are you planning to build a screamer or a torquer? FI or NA? Gonna over-bore it? How 'bout some more info on what you want.
01-14-2008, 11:38 AM
#3
Not bashin you or anything, but why the interest in building up a 4.8? Class rules, spec class, love the short stroke, just cause?
If its the short stroke/fast rev aspect that pulls your trigger, why not find a way to put the 4.8 crank (3.26") into a 6.0 block (with its 4" bore) to make a true LS 327-ish engine. I'd love to see someone put that engine together, as I myself am a fan of the fast revving engines as well.
If its the short stroke/fast rev aspect that pulls your trigger, why not find a way to put the 4.8 crank (3.26") into a 6.0 block (with its 4" bore) to make a true LS 327-ish engine. I'd love to see someone put that engine together, as I myself am a fan of the fast revving engines as well.
01-15-2008, 09:12 AM
#4
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well i want to keep at the stock bore...I want to build one up to around a 300 shot of nos...I have seen a 5.3 hold a 300shot stock but i dont want to risk blowing anything up...
01-15-2008, 12:39 PM
#6
I don't understand why you would want to spend more money to have a smaller motor.
No one makes a off the shelf forged piston or rods for the 4.8, so you would have to custom piston. You could use some aftermarket rods, but again, there are no direct replacements, so you would have to make your custom piston made to fit the rod also.
If you want to built a stout motor, your cheapest solution is to build an iron block 5.7. All you need is a crank from a 5.3,5.7 or 6l then some off the shelf forged pistons and rods and bore your 4.8 block to fit the piston. A bigger motor for less money, but that just my opinion.
Personally, I think these trucks are too heavy for a short stroke motor like the 4.8, and need the extra torque that you get with the longer stroke that the 5.7 would have. This is coming from a guy with a 500rwhp 4.8
No one makes a off the shelf forged piston or rods for the 4.8, so you would have to custom piston. You could use some aftermarket rods, but again, there are no direct replacements, so you would have to make your custom piston made to fit the rod also.If you want to built a stout motor, your cheapest solution is to build an iron block 5.7. All you need is a crank from a 5.3,5.7 or 6l then some off the shelf forged pistons and rods and bore your 4.8 block to fit the piston. A bigger motor for less money, but that just my opinion.
Personally, I think these trucks are too heavy for a short stroke motor like the 4.8, and need the extra torque that you get with the longer stroke that the 5.7 would have. This is coming from a guy with a 500rwhp 4.8
