Ls1/5.7 To Lq4/4.8 Will They Work
04-22-2004, 08:15 PM
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The intake valve is slightly larger (2.00" versus your 1.89") on the LS1 and could add slightly more power potential if you plan to run over 6,000 RPM's. The exhaust valves are the same diameter. Almost everything else about the heads are the same except the combustion chamber size (about 66.67 cc's for the LS1 and 64.45 cc's for the LS6 versus 61.15 cc's for your LM4). So the LS1/LS6 combustion chamber would lower your compression chamber (which you don't want) unless you milled the head to reduce the combustion chamber size. The heads will bolt right on, no problem. Same connecting rods, rocker arms, gaskets, everything is interchangable.
However, I don't think that you would get much bang (if any) for the buck. What are your goals for your truck? How do you use your truck? What else have you done? How much do you have to spend?
I'll try to give you some advice if you want more.
Steve
However, I don't think that you would get much bang (if any) for the buck. What are your goals for your truck? How do you use your truck? What else have you done? How much do you have to spend?
I'll try to give you some advice if you want more.
Steve
04-23-2004, 12:10 AM
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I think he's blown and is looking to further lower his CR.
If thats the case, I'd just stick with LS1 heads, as unported 6L heads would not gain that much flow and CR should already be under 9:1 on a 4.8 with LS1 heads.
If thats the case, I'd just stick with LS1 heads, as unported 6L heads would not gain that much flow and CR should already be under 9:1 on a 4.8 with LS1 heads.
04-23-2004, 07:07 AM
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I agree with you Big Tex if he is using a blower. If he is'nt and wants the most bang for the buck, a different (slightly larger cam, grind depends upon use) and a good tune would help a lot, as would long tube headers.
Steve
Steve
04-27-2004, 05:40 PM
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no blower just a lot of nos ive heard u want low cr for nos instead of high cr the truck is 02 sierra 4.8 stock 410gears posi hedmann shortys electric fan tb spacer underdrive pully dual 2.5inch exuast dual flowmaster with turndowns hyper tech programmer built 4l60e trans dry nos 61pill plus ive took anything that was heavy off because of weight 26ettreet tires it ran 1/8 7.508 at 83 mph i did let off at the 600 ft because of rev limit
