4.8/5.3 heads to Ls1 heads
07-30-2008, 02:43 PM
#1
FormerVendor
Thread Starter
iTrader: (67)
Join Date: Jun 2006
Posts: 138
Likes: 0
Received 0 Likes
on
0 Posts
4.8/5.3 heads to Ls1 heads will Ls1 fbody heads #241 fit on a 04 yukon 4.8 that has head #706
was told the 4.8 heads are the same as the 5.3
and ppl change the fbody to 5.3
so was just wondering if the heads would bolt up to the truck
pls help, any info appreciated
nu-B here
was told the 4.8 heads are the same as the 5.3
and ppl change the fbody to 5.3
so was just wondering if the heads would bolt up to the truck
pls help, any info appreciated
nu-B here
07-30-2008, 09:04 PM
#3
I put L33 heads on my 4.8, and they woke it up quite a bit. They have the same size valves (2.00/1.55) as your LS1 heads versus the LR4's 1.90/1.50s. I don't know what the difference in your chamber is, but I actually gained compression with this swap, coupled with a home port job, I got a noticeable seat of the pants difference. I am running the 799 casting (that's the chamber in my sigline).
07-31-2008, 12:14 PM
#5
Like I said, I'm running them on my 4.8. The only thing that does is help flow. Our smaller bore can't make quite the use of it that an LS1 or 6.0L engine can, but if you're asking if valve clearance will be an issue, the answer is no (assuming your camshaft is still a stocker).
07-31-2008, 12:22 PM
#6
I put L33 heads on my 4.8, and they woke it up quite a bit. They have the same size valves (2.00/1.55) as your LS1 heads versus the LR4's 1.90/1.50s. I don't know what the difference in your chamber is, but I actually gained compression with this swap, coupled with a home port job, I got a noticeable seat of the pants difference. I am running the 799 casting (that's the chamber in my sigline).
the chamber should be around 65-66cc's
