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?

 

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.

 

neither... a part was left out

Now, back to the heads

 

Sorry for your Loss,

Who did the work

4 Mos !

Shitt I could built a New motor home in that time lol

 

Wow...that is messed up.

 

That's saltyy.. Sorry to hear that.

 

WTF!!!!!!!!!!!! NO ****! Man im sorry to hear that bro...I guess its time for a nice new short block That sucks sooooo bad tho i would be pissed Dont give up tho...Keep building that bitch stronger.........

 

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.

 

Call up HKE and get a 440ci built. I'd go off what your engine builder recommends for heads.

 

I'm trying to figure out which head to buy, LS7? AFR? Trickflow?

Yeah, this situation is retarded.

 

Won't you need new headers with AFR / TFS since they're cathedral?

 

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!!!

 

word.

 

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.

 

Ported LS7 head is the best. I have them in stock if you need some.

 

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.

 

Man sorry to hear. I did the same thing and then the machine shop cracked the block doing the sleeve. Had to start all over so I went stroker

 

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..

 

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

 

I had the Exhaust valves changed, the valve lash caps were not installed.

That's the TI intake valve that dropped...

But yes, the Stock Sodium 2-piece valve breaks usually.