Stock assembled 241 heads, low miles
02-01-2009, 07:25 AM
#1
Stock assembled 241 heads, low miles
SOLD!
I have for sale the stock assembled 241 cylinder heads that came off my '04 GTO when I did a H/C swap in Spring '07. They have less than 9K miles on them. I'm looking to get $150 shipped and can accept Paypal.
Here are a few pics...
I have for sale the stock assembled 241 cylinder heads that came off my '04 GTO when I did a H/C swap in Spring '07. They have less than 9K miles on them. I'm looking to get $150 shipped and can accept Paypal.
Here are a few pics...
Last edited by Smitty's '04 GTO; 03-02-2009 at 11:44 AM.
02-12-2009, 09:15 AM
#3
FWIW, these heads have the "Green Stripe" factory valve springs. Please do your own research, but this is what I found...
The "Green Stripe" springs that came on '04 LS1's are GM part # 12565117. They were originally introduced on the '01 version of the Z06/LS6 and are said to be good to .540 valve lift and are rated at 90#/259#'s open/closed. This is a mild upgrade from the earlier version LS1 springs, which were rated at 76#/220#'s. These aren't quite as good as the '02+ version of the LS6 springs which were rated at 90#/294#'s and said to be good to .570 valve lift. AGAIN, DO YOUR OWN RESEARCH...
I can say positively that I was running these heads with a .521/.508 lift combo with no problems prior to removal...
Just thought I'd throw that info out there incase anyone was looking for a set of heads to massage for a mild build, or if someone had a high mileage Gen III and was looking to rebuild, you could swap these in lieu of reconditioning your stockers...
The "Green Stripe" springs that came on '04 LS1's are GM part # 12565117. They were originally introduced on the '01 version of the Z06/LS6 and are said to be good to .540 valve lift and are rated at 90#/259#'s open/closed. This is a mild upgrade from the earlier version LS1 springs, which were rated at 76#/220#'s. These aren't quite as good as the '02+ version of the LS6 springs which were rated at 90#/294#'s and said to be good to .570 valve lift. AGAIN, DO YOUR OWN RESEARCH...
I can say positively that I was running these heads with a .521/.508 lift combo with no problems prior to removal...
Just thought I'd throw that info out there incase anyone was looking for a set of heads to massage for a mild build, or if someone had a high mileage Gen III and was looking to rebuild, you could swap these in lieu of reconditioning your stockers...
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