i have a 5.3 witch heads do i use?
03-12-2009, 03:04 PM
#1
Staging Lane
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i have a 5.3 witch heads do i use? i have a 5.3 LQ4 out of a truck and im puttin it in a 1980 TA and i want to put a magnuson supercharger on it. so my question what is the best factory casting # to use? and what kind of automobile is it from?
i dont want the brand new heads with the variable valve timeing ....i dont think i can afford them.
i dont want the brand new heads with the variable valve timeing ....i dont think i can afford them.
03-12-2009, 03:36 PM
#2
TECH Fanatic
i have a 5.3 LQ4 out of a truck and im puttin it in a 1980 TA and i want to put a magnuson supercharger on it. so my question what is the best factory casting # to use? and what kind of automobile is it from?
i dont want the brand new heads with the variable valve timeing ....i dont think i can afford them.
i dont want the brand new heads with the variable valve timeing ....i dont think i can afford them.
03-12-2009, 09:29 PM
#4
TECH Regular
The lq4/9 both are 6.0's. The lq4 has slightly lower compression and is found in the 3/4 ton trucks and H2's. The lq9 is found in the Escalades, SS trucks, and Denalis. As for the 5.3, there are a few different ones. The block will say 4.8/5.3 on the back if it's a 4.8 of 5.3. The 6.0's say just "6.0" on the back.
03-12-2009, 11:45 PM
#7
Run the stock 5.3 heads. I have a LS1 book that tells the mods you can do for different LSX engines. If you don't get the correct size chamber you can actually lose power. For example in this book they put on a set of 243 heads (from an LS2/LS6) on a 5.3 and actually lost power. I have a 5.3 in my 1500 Silverado Extended Cab 4X4. It scoots for such a large vehicle and it is stock.
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03-13-2009, 01:52 PM
#8
Run the stock 5.3 heads. I have a LS1 book that tells the mods you can do for different LSX engines. If you don't get the correct size chamber you can actually lose power. For example in this book they put on a set of 243 heads (from an LS2/LS6) on a 5.3 and actually lost power. I have a 5.3 in my 1500 Silverado Extended Cab 4X4. It scoots for such a large vehicle and it is stock.
from the factory. the chamber issue is really not big of a deal.
stay with the stock heads. they are more than enuff for the build
03-16-2009, 05:15 PM
#10
I wasn't aware that they are using those heads on the new 5.3s. They are a decent stock head.
03-16-2009, 05:32 PM
#11
TECH Fanatic
They have flat tops like the 4.8L's to increase CR with the 243 for the high HP ratings started with the L33. All the 07 up trucks 5.3L are 243 now.
