4.8 combo, looking for a little help.
Thread Starter
On The Tree
Joined: Jan 2009
Posts: 127
Likes: 0
From: Sebring, FL
4.8 combo, looking for a little help. I want to get a 4.8, add ARP hardware, LS9 head gaskets, LS6 cam, springs, and intake. Also in the plan is a 76 mm ebay turbo and making my own kit running 10-12 lbs.
Does anyone know off hand what heads come on the 07+ LY2's? Are there any options down the road for more power heads wise?
I know the LS6 cam will go in a 5.3 all day long with no problems, is this true with the 4.8?
I am absolutely clueless about injectors, HELP!
What approximate power range should be attainable with this combo? I would think the bottom should be safe to about 600 RWHP as a 5.3/6.0 would, correct?
Does anyone know off hand what heads come on the 07+ LY2's? Are there any options down the road for more power heads wise?
I know the LS6 cam will go in a 5.3 all day long with no problems, is this true with the 4.8?
I am absolutely clueless about injectors, HELP!
What approximate power range should be attainable with this combo? I would think the bottom should be safe to about 600 RWHP as a 5.3/6.0 would, correct?
I want to get a 4.8, add ARP hardware, LS9 head gaskets, LS6 cam, springs, and intake. Also in the plan is a 76 mm ebay turbo and making my own kit running 10-12 lbs.
Does anyone know off hand what heads come on the 07+ LY2's? Are there any options down the road for more power heads wise?
I know the LS6 cam will go in a 5.3 all day long with no problems, is this true with the 4.8?
I am absolutely clueless about injectors, HELP!
What approximate power range should be attainable with this combo? I would think the bottom should be safe to about 600 RWHP as a 5.3/6.0 would, correct?
Does anyone know off hand what heads come on the 07+ LY2's? Are there any options down the road for more power heads wise?
I know the LS6 cam will go in a 5.3 all day long with no problems, is this true with the 4.8?
I am absolutely clueless about injectors, HELP!
What approximate power range should be attainable with this combo? I would think the bottom should be safe to about 600 RWHP as a 5.3/6.0 would, correct?
-If you want to lower the compression some put some low cost 241 heads on there
-For 600rwhp you will need a minumum of 60lb injectors with a return fuel system with the appropriate pump...you could easily reach your goal with 15psi
check out performanrtrucks.net for more 4.8/5.3 info......
Thread Starter
On The Tree
Joined: Jan 2009
Posts: 127
Likes: 0
From: Sebring, FL
My objective for this build is a baby step... I will eventually swap the 4.8 for a 6.0 aimed at the 900+ hp mark. I want to get some extra power, but not so much that I destroy a poor little motor for nothing. I need the motor to last a while, so I figured that 10 psi and a good tune should hold me over.
I have seen the ls6 intake used on the 5.3 for boost, I figured it would be a safe bet.
If I get some 60lb injectors and run closer to 500hp rather than 600hp, I should be gravy, right? My uneducated guess is somewhere around the 500rwhp mark on 10 psi. Can anyone confirm this?
I have seen the ls6 intake used on the 5.3 for boost, I figured it would be a safe bet.
If I get some 60lb injectors and run closer to 500hp rather than 600hp, I should be gravy, right? My uneducated guess is somewhere around the 500rwhp mark on 10 psi. Can anyone confirm this?
-Get arp rod bolts, skip the ls9 gaskets and use stock mls,ls6 cam is good,and what intake? 4.8/5.3 heads are the same and the ls6 cam will go into any gen3 motor
-If you want to lower the compression some put some low cost 241 heads on there
-For 600rwhp you will need a minumum of 60lb injectors with a return fuel system with the appropriate pump...you could easily reach your goal with 15psi
check out performanrtrucks.net for more 4.8/5.3 info......
-If you want to lower the compression some put some low cost 241 heads on there
-For 600rwhp you will need a minumum of 60lb injectors with a return fuel system with the appropriate pump...you could easily reach your goal with 15psi
check out performanrtrucks.net for more 4.8/5.3 info......
ls9 gaskets are close to same price as reg mls but designed for boost i see no reason not to use them
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My truck is an 07 new body style, and it has the 243 heads on it. Which should be good for your setup, just have them ported. Injector wise I have some 71#s for sale which took my car to 650rwhp without any problems.
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My objective for this build is a baby step... I will eventually swap the 4.8 for a 6.0 aimed at the 900+ hp mark. I want to get some extra power, but not so much that I destroy a poor little motor for nothing. I need the motor to last a while, so I figured that 10 psi and a good tune should hold me over.
I have seen the ls6 intake used on the 5.3 for boost, I figured it would be a safe bet.
If I get some 60lb injectors and run closer to 500hp rather than 600hp, I should be gravy, right? My uneducated guess is somewhere around the 500rwhp mark on 10 psi. Can anyone confirm this?
I have seen the ls6 intake used on the 5.3 for boost, I figured it would be a safe bet.
If I get some 60lb injectors and run closer to 500hp rather than 600hp, I should be gravy, right? My uneducated guess is somewhere around the 500rwhp mark on 10 psi. Can anyone confirm this?
As far as injectors if your planing on a 900 + hp build later i would buy injectors that you would use for that build (like 100 #) there is no sense in buying injectors twice and with a good turner they should work fine for this build
also you should be 500rwhp range at 10psi but there is a number of factors
main ones being your tune, your parts selection, and drivetrain
Thread Starter
On The Tree
Joined: Jan 2009
Posts: 127
Likes: 0
From: Sebring, FL
Well, I do not even have a motor yet, I was hoping to pick up a 4.8 with my tax refund. I know where one is for $350. I have a 94 Firebird Formula, but I am not sure if that will be the project car or not.
I am going to get the motor the way I want it before I decide what to put it in. I was thinking of building the 4.8 later on, but the 6.0 has more potential, so the 4.8 will not get a set of heads. Just cam, springs, head gaskets, and intake for now. I will then swap parts to make it fit in what I decide. After that comes boost.
I am going to get the motor the way I want it before I decide what to put it in. I was thinking of building the 4.8 later on, but the 6.0 has more potential, so the 4.8 will not get a set of heads. Just cam, springs, head gaskets, and intake for now. I will then swap parts to make it fit in what I decide. After that comes boost.
Last edited by Slowmo_Bird94; Dec 21, 2010 at 04:30 PM.
the 4.8 are strong motors, ive seen / heard of stock bottom end 4.8 making 800+ hp
for how long idk lol
as for mine im looking to make at least 700rwhp with e85 at probably 18- 20 psi and that is a stock bottom end 4.8 with arp bolts and ls9 headgaskets and 317 heads
for how long idk lol
as for mine im looking to make at least 700rwhp with e85 at probably 18- 20 psi and that is a stock bottom end 4.8 with arp bolts and ls9 headgaskets and 317 heads
Thread Starter
On The Tree
Joined: Jan 2009
Posts: 127
Likes: 0
From: Sebring, FL
So is everyone pretty much in agreement that I may have a decent combo lined up here? 4.8, LS6 cam, LS6 intake, LS6 valve springs, LS9 head gaskets, and 60+lb injectors for about 500-550 rwhp? It will be a LONG time before I get to the big time build, so I just need the right injectors for now.
Thread Starter
On The Tree
Joined: Jan 2009
Posts: 127
Likes: 0
From: Sebring, FL
http://sdparts.com/details/gm-factor...parts/12565308
Right there in the print. Apparently the LS6 has a longer valve stem? Doesn't make sense to me, but I have a lot to learn too.
Right there in the print. Apparently the LS6 has a longer valve stem? Doesn't make sense to me, but I have a lot to learn too.
Last edited by Slowmo_Bird94; Dec 25, 2010 at 07:33 AM.
http://sdparts.com/details/gm-factor...parts/12565308
Right there in the print. Apparently the LS6 has a longer valve stem? Doesn't make sense to me, but I have a lot to learn too.
Right there in the print. Apparently the LS6 has a longer valve stem? Doesn't make sense to me, but I have a lot to learn too.