GM 4.8L 5.3L LS REMANUFACTURED Cylinder Heads 862 Assemblies w/Rocker Arms SET OF 2 706 (Renewed)

First off I'm writing this review due to the seller not responding to the issue I experienced 5 days ago. The head's definitely look like they had been professionally rebuilt. So my confidence was high. Unfortunately I was let down and after less than a hundred miles one of the valve springs failed/broke (see pictures). Fortunately when this happened I was only a half a mile away from my home/shop and driving at 35 mph. After using a borescope to check the cylinder I was able to determine that there was no damage to the Piston, cylinder walls and the valve. Due to my lack of confidence in the rest of the valve springs I am replacing all of them with new LS6 BTR valve springs.. Bottom line if you're not already planning to replace the valve springs do not trust these cylinder heads ! And do not rely on the seller to provide any support.

They work fine but I shouldn't have to pull and replace helicoils due to improper installation. Out of 2 head I had to replace 3 helicoils that were badly installed before I could even I stall the heads.

Looked good wasted time do to faulty seals in heads so back to square one ..