best heads for boosted 5.3
10-20-2009, 08:40 PM
#12
Honestly, I don't think it's going to matter which heads you run. The small difference between those heads isn't enough to notice.
With my 408, truck intake, stock throttle body, STOCK HEADS, cam only, laid down 821hp on only 12psi. I don't think heads make a huge power difference, but the thick deck of aftermarket heads would help clamping force, but you're only going to push 12psi through'em.
With my 408, truck intake, stock throttle body, STOCK HEADS, cam only, laid down 821hp on only 12psi. I don't think heads make a huge power difference, but the thick deck of aftermarket heads would help clamping force, but you're only going to push 12psi through'em.
07-26-2019, 12:07 AM
#18
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yes they do make a difference, but going back to his question, not really.
he's running a 5.3L, pretty much stock, with a turbo.
Regardless of what head he chooses from the list above, his engine isn't going to make that much more power.
With 10psi, it'll probably put out 450hp or so, add a few more psi, and it'll still be under 490hp, at that point, how much do you think 243 heads are going to give this engine over the LM7 heads?
Keep in mind, we're only talking his setup, and the three head castings above.
We're talking stock heads on a turbocharged 5.3L.
he's running a 5.3L, pretty much stock, with a turbo.
Regardless of what head he chooses from the list above, his engine isn't going to make that much more power.
With 10psi, it'll probably put out 450hp or so, add a few more psi, and it'll still be under 490hp, at that point, how much do you think 243 heads are going to give this engine over the LM7 heads?
Keep in mind, we're only talking his setup, and the three head castings above.
We're talking stock heads on a turbocharged 5.3L.
07-26-2019, 12:16 AM
#19
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Here is my set up. 5.3, 212 216 .525 115 cam, front mount 70mm with IC. I am looking for the best heads for my set up. I will be running about 12psi. Just looking for a stock replacement. Which would be best. 243's, 241's, 799's. Not looking to lower the comp way down so 317's wont work, i dont think. Just looking for opinions. I post this on some other boards so just seeing what yall think.
Thanks
Thanks
Last edited by Ronniep3; 07-26-2019 at 12:22 AM.
07-27-2019, 11:06 AM
#20
for an engine already in the mid-9s for CR, i wouldn't lower it more for something he wants good drive-around-town feel in. with a 12psi boost goal, i'd personally either mill stock 243/799s or do a valve job on the 5.3 heads... or just leave them be.