My H/C LS7 is dead after 300miles...
01-04-2011, 10:20 PM
#1
TECH Fanatic
Thread Starter
Join Date: Oct 2005
Location: DFW
Posts: 1,698
Likes: 0
Received 0 Likes
on
0 Posts
My H/C LS7 is dead after 300miles... At this moment, I do NOT plan on telling the whole story and the F'ing BS I have gone through in the past 6 months.
My 560/523wheel Heads / Cam LS7 dropped an intake valve and toasted the whole motor (needs a sleeve at minimal).
What should I get?
Stock LS7 heads or Aftermarket?
I'm thinking aftermarket but I'm not sure of who or what is the best route for the LS7 head.
Okay, so what do I buy?
My 560/523wheel Heads / Cam LS7 dropped an intake valve and toasted the whole motor (needs a sleeve at minimal).
What should I get?
Stock LS7 heads or Aftermarket?
I'm thinking aftermarket but I'm not sure of who or what is the best route for the LS7 head.
Okay, so what do I buy?
Last edited by SilveradoSS500; 01-05-2011 at 12:08 AM.
01-04-2011, 11:26 PM
#2
TECH Apprentice
Join Date: Jan 2008
Location: Gladstone, Queensland, Australia
Posts: 366
Likes: 0
Received 0 Likes
on
0 Posts
Sounds like valve float caused your issue/over revving or not enough spring pressure or just bad luck. you can only put a valve in one way.
01-05-2011, 12:03 AM
#3
TECH Fanatic
Thread Starter
Join Date: Oct 2005
Location: DFW
Posts: 1,698
Likes: 0
Received 0 Likes
on
0 Posts
Dont give up tho...Keep building that bitch stronger.........
01-05-2011, 07:03 AM
#8
On The Tree
iTrader: (2)
Join Date: Oct 2010
Location: Waffle Land
Posts: 119
Likes: 0
Received 0 Likes
on
0 Posts
That ******* sucks. I though I had rod knock when I broke a valve spring. I thought I dropped a valve too. Scared the **** out of me. Its hard to tell some times.
01-05-2011, 01:20 PM
#12
TECH Fanatic
iTrader: (16)
Join Date: Apr 2005
Location: Romeoville, IL
Posts: 1,419
Likes: 0
Received 0 Likes
on
0 Posts
Depends on how much money you want to spend compared to how much extra power you will get with the higher $ heads. I would say if you are going to go all out, more c.i., higher compression, big cam and E85, then I would say go with the AFR's or Trickflows. However if you are going to do a nice setup, nothing insane, then I would save the money and get some Cnc'ed LS7's from texas speed and have them decked to give you some more compression.
Good question on the headers tho.
btw sucks to hear about the motor!!!
Good question on the headers tho.
btw sucks to hear about the motor!!!
01-05-2011, 01:43 PM
#13
Depends on how much money you want to spend compared to how much extra power you will get with the higher $ heads. I would say if you are going to go all out, more c.i., higher compression, big cam and E85, then I would say go with the AFR's or Trickflows. However if you are going to do a nice setup, nothing insane, then I would save the money and get some Cnc'ed LS7's from texas speed and have them decked to give you some more compression.
Good question on the headers tho.
btw sucks to hear about the motor!!!
Good question on the headers tho.
btw sucks to hear about the motor!!!
01-05-2011, 02:30 PM
#14
TECH Enthusiast
iTrader: (6)
Join Date: Nov 2004
Location: Knoxville, TN
Posts: 549
Likes: 0
Received 0 Likes
on
0 Posts
I hate to hear about your engine. I would recommend the PI/Mast LS7 heads as the first choice, TFS second and AFR third. BTW, I have a complete 427 for sale.
01-05-2011, 06:36 PM
#16
TECH Fanatic
Thread Starter
Join Date: Oct 2005
Location: DFW
Posts: 1,698
Likes: 0
Received 0 Likes
on
0 Posts
Looks like LS7 cores will be the way to go!
So, I green lighted the motor coming out, it will be out in the next 2 weeks. Then I will go from there and see how bad things are.
So, I green lighted the motor coming out, it will be out in the next 2 weeks. Then I will go from there and see how bad things are.
01-06-2011, 06:19 AM
#18
Like I said before sorry for your 2nd loss...
Give TSP a call for PRC heads awesome price and great power ( I dynoed it myself only the heads and retune gained 39rwhp
Also TSP build 454ci Resleeved LS7
with the right H/C/I 620+rwhp wont be a problem..
Give TSP a call for PRC heads awesome price and great power ( I dynoed it myself only the heads and retune gained 39rwhp
Also TSP build 454ci Resleeved LS7
with the right H/C/I 620+rwhp wont be a problem..
01-12-2011, 11:20 AM
#19
TECH Apprentice
iTrader: (1)
Join Date: Nov 2007
Location: illinois
Posts: 388
Likes: 0
Received 0 Likes
on
0 Posts
Ls7 valves are garbage...can't even contact the dropped valve threads and total engine losses..if you want the best power..get trick flows 235 or 245 cathedral port..with ss valves
01-12-2011, 04:47 PM
#20
TECH Fanatic
Thread Starter
Join Date: Oct 2005
Location: DFW
Posts: 1,698
Likes: 0
Received 0 Likes
on
0 Posts
That's the TI intake valve that dropped...
But yes, the Stock Sodium 2-piece valve breaks usually.