GM LS Catherdral Port 706 Heads Lm4 Lm7 5.3 12561706 New Valve Seals + More

$399.0 Buy It Now or Best Offer
free,30-Day Returns

Seller Store joeyg329
(651) 98.9%,

Location: Barrington, New Jersey
Ships to: US,
Item: 326071720671

Returns Accepted:ReturnsNotAccepted
GM:GM
Type:Cylinder Head
OE/OEM Part Number:12561706
Items Included:Seal
Mileage:75,000-100,000 miles
Material:Aluminum
Country/Region of Manufacture:United States
Item Weight:26 X 2

Set of desirable cathedral port LS (gen 4 small block chevy) heads off a LM7 RPO GM truck. Casting number 12561706 Comes with : New felpro ss 71039 valve stem seals freshly installed. Valves were lightly cut ( didn’t need much to smooth out at all) The valve springs were replaced a few years ago, still strong and valve height is in spec. Not cheap junk, ac delco springs. Oem retainers/keepers/valves Coolant cross over caps (1 each head) Dowels Surfaces cleaned. All threads were chased and smooth. All exhaust manifold bolt threads are clean and good. No broken bolts Head surface was cleaned with 3m white ( highest grit) ceramic finger prep roloc (does not damage aluminum) and surface cleaner. All valves have no leakage. No broken springs. No cracks Valve guides good. I scrubbed the intake/exhaust ports, still some minor carbon on the walls but everything looks good. Spark plug threads perfect. I pulled these heads off an 04 chevy avalanche 5.3 that my old boss broke the oil pan hitting something with. Engine was shut off immediately and he purchased a new vehicle. I was going to use them on a 6.0 turbo build for my g body monte but life happened. This is a great bolt on and go set of heads If you’re doing an LS swap i also have the rocker shafts, rockers, rocker bolts, stock pushrods, valve covers, and valve cover bolts available in separate listings. I originally had everything in one package but i realized not everyone needs all the stuff. Contact me first and ill work out a deal for the complete set up. Fits various LS engines and came on 1999-and-up 4.8 and 5.3 truck engines. They have 61.15cc combustion chambers so they are great for turbo, supercharger, or nitrous builds. Better then 317 and 862 heads. They can be fitted with larger valves as well. The 706’s have Semi permanent mold castings so they flow smooth. Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter: 1.55 inches Combustion chambers: 61.15 cc Buyers responsibility to verify fitment to your application. Feel free to ask any questions before buying. No returns. No cancellations 60 minutes after purchase. I ship with care. Thank you.

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