WebOct 14, 2024 · While 862 heads are sand cast, 706 heads are semi-permanent mold. Also, they have smaller combustion chambers, and the milling of the deck surface will allow a … WebNov 18, 2024 · Both of the cylinder heads possess the same valve size. Additionally, they have ports and chamber cores of the same size. The … boulder cycling group rides Web862 heads have a flat-top design, meaning the valves sit directly on the combustion chamber. They have a raised valve seat and an increased volume for better flow. The exhaust valve is also raised, allowing for a more efficient exhaust flow from the cylinder head. The intake valve and manifold are also raised to improve airflow into the engine. WebSpeed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. We have a few options you can purchase such as a pair of Stage 1, Stage 2, … boulder cycling race WebOur fully CNC'd 706 or 862 heads give you an aftermarket 2.020 intake/1.570 exhaust with an intake flow of 305cfm and an exhaust flow of 220cfm 832-619-1622 7413 Wright Rd. Houston, TX 77041 WebMar 5, 2024 · 706 heads are semi-permanent mold, whereas 862 are sand cast. They also have smaller combustion chambers and a somewhat higher compression ratio than the … 22 wilson ave WebJun 9, 2016 · The heads with the casting flaw were the 706 castings made by castech from 2000-2005. The 862s are functional equivalents from the same years and were never suspect for cracks. Some early LS heads from 98-01, both the 853/806 LS1 and the 706/862 5.3/4.8 had the casting notch. The notch disappears sometime in 2001 but nobody is sure.

WebJul 31, 2024 · The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. The 862/706 heads have smaller combustion chambers than the Gen IV, raising the compression ratio when swapped directly. WebFeb 14, 2024 · The 706 Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM (semi-permanent mold) made, while … boulder cycling map WebWhich factory LS cylinder head works best with a turbo, 706 or 317? It's the age-old comparison, airflow vs compression. This LS head shoot out between the s... WebJul 1, 2013 · This is a discussion on 862 vs. 241... within the Internal Engine forums, part of the LSx Technical Help Section category; Need to shut a teenager up about the difference in the way they flow. Googled it to no avail. ... Casting Number 706 and 862 Head: 1999+ 4.8L / 5.3 Liter Truck Material: Aluminimum Part Number: 12559862 12561706 Combustion ... 22 wilson ave nesconset WebNov 19, 2024 · Why Is 862 Heads A Higher Selection Than 706 Heads? Sand-casted 862 heads have proved to be higher than others. They carry out properly, even with smaller … 22 wilson ave ne WebSep 24, 2015 · GM 706/862 5.3-Liter LS1, 218 cc . Advanced Induction GM 243 (LS6) and 799 (LS2), 218 cc. The 218-cc LS6/LS2 head is a mild upgrade from the basic performance rebuild, which boosts flow by 32.2 …

WebDec 4, 2024 · Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5.3L test motor. There was much uproar among 799/243 head enthusiasts. Than... boulder cycling shops WebApr 20, 2024 · You are much better off with the 706/862 heads from a compression standpoint. Also, the port velocity on the 706/862 head is much better than the 799/243, which will help you with the small bore of the 5.3. The 706/862 respond very well to a light runner cleanup and a good multi angle valve cut. If you want to bump the compression, … boulder cyclist death