LSA valve spring specs?? Part numbers?
04-07-2011, 06:12 PM
#1
LSA valve spring specs?? Part numbers? Hi I am going to need new valve springs because I am running a t76 turbo and ls9 cam on my 4.8. Would lsa valve springs be a good choice if i run less than 15lbs of boost? Also, does anyone know the part numbers for these? I searched but couldn't find anything due to how new this engine is I'm assuming.
Would there be a better choice for around 100-120 bucks? I read the ls7 springs are good to .600 lift
Thanks
Would there be a better choice for around 100-120 bucks? I read the ls7 springs are good to .600 lift
Thanks
04-08-2011, 11:19 AM
#3
The LSA uses the standard 12589774 spring found in most LS based factory engines, including the 4.8 truck engine you have.
So, your 4.8 will have the same springs as the LSA, so you will not be upgrading at all by swapping to the same springs lol....
Nothing special is required for the LSA because of the gentleman's cam that is installed.
LS7 springs have a much taller installed height and will not work for you.
FYI the LS9 in the ZR1 vette still uses the regular 12586484 LS2/LS3 spring which are only 90lbs on the seat.
I would throw on a set of aftermarket beehives at least just to be safe for a turbo application.
Good luck!
Jim
LS valve Spring kit
So, your 4.8 will have the same springs as the LSA, so you will not be upgrading at all by swapping to the same springs lol....
Nothing special is required for the LSA because of the gentleman's cam that is installed.
LS7 springs have a much taller installed height and will not work for you.
FYI the LS9 in the ZR1 vette still uses the regular 12586484 LS2/LS3 spring which are only 90lbs on the seat.
I would throw on a set of aftermarket beehives at least just to be safe for a turbo application.
Good luck!
Jim
12499224
LS valve Spring kit
(not shown)
• Beehive style springs
• Beehive style springs
• Used on LS2/LS6 cylinder heads
• 1.800" installed height @ 90 lbs.
• 1.800" installed height @ 90 lbs.
pressure
• Max lift .570"
• 1.250" @ 295 lbs. pressure
• Includes 16 of P/N 12586484
12586484
valve Springs
• Max lift .570"
• 1.250" @ 295 lbs. pressure
• Includes 16 of P/N 12586484
12586484
valve Springs
(not shown)
• Beehive style springs
• Beehive style springs
• Standard LS6/LS3 springs
• Use cap P/N 10166344
• 1.250" @ 295 lbs. pressure
• 1.800" installed height @ 90 lbs.
• Use cap P/N 10166344
• 1.250" @ 295 lbs. pressure
• 1.800" installed height @ 90 lbs.
pressure
• Max lift .570"
12589774
valve Springs
• Max lift .570"
12589774
valve Springs
(not shown)
• Beehive style springs
• Beehive style springs
• Standard L76/L92 springs
• 1.800" installed height @ 90 lbs.
• 1.800" installed height @ 90 lbs.
pressure
• Max lift .520"
• 1.300" @ 264 lbs. pressure
12578457
valve Springs
• Max lift .520"
• 1.300" @ 264 lbs. pressure
12578457
valve Springs
(not shown)
• Beehive style springs
• Beehive style springs
• Used on LS7 cylinder heads
• 1.960" installed height
@ 101 lbs. pressure
• 1.368" @ 310 lbs. pressure
• 1.960" installed height
@ 101 lbs. pressure
• 1.368" @ 310 lbs. pressure
• Max lift .600"
Last edited by camarols1; 04-08-2011 at 11:35 AM.
04-08-2011, 12:48 PM
#5
Camarols1, where did you find that they're the same? Nowhere does it say LSA in the application. The LSA engines run 12 psi of supercharger boost from what I hear.. If that is true, then why would the springs be the same as my 4.8 truck springs. I just bought a set with retainers and seats for 100 bucks so I sure hope they have at least .600 lift
looks like I just wasted money 