WebJan 21, 2024 · RPO L99 and LS3 cylinder heads are aluminum with 68cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2.165˝ intake valves and 1.590˝ exhaust valves. These heads can be CNC-ported to improve on flow and milled for higher compression. These heads are almost the same, … WebChevrolet Performance’s Fast-Burn 23-degree cylinder heads deliver maximum performance for Small-Block engines. An aluminum head casting – distinguished by Chevy Bowtie logos at each end – and a valvetrain with high-rpm, LS-style beehive-type valve springs stretches the performance range of the heads to enable greater power at a …
Ultimate LS Cathedral Port Cylinder Heads Guide - LS Engine DIY
WebHead casting numbers and the head casting date are located under the valve covers, in the rocker arm valley. Number ... Buick/Chevy aluminum 10' head, 42cc chambers, … WebSBC Head Casting Numbers: Full List & Lookup ... Cast iron Cylinder head material: Cast iron It’s worth noting that while the 3855961 casting number was used for a variety of … caht tv
SBC cylinder head identification - Crankshaft Coalition
WebCylinder heads are normally date coded in the form of a letter for the month (see table below), two numbers for the day and a single number for the year. For example, C259 indicates a date of March 25, 1969. V8 C … WebFind many great new & used options and get the best deals for GM Phase 6 Sbc Bowties Heads Aluminum Sbc Heads casting number 14011049 at the best online prices at eBay! Free shipping for many products! WebMar 13, 2024 · 3991492 71-up Replacement head, 64cc, straight or angle plug. 3998916 350 72 LT1, 76cc, screw in studs, large valves. 3998920 350 72-73. 3998991 307,350 72-73 74.5cc, hardened seats in 73. 33998993 307,350 72-73 74.5cc, hardened seats in 73, 159/64cc port volumes. 3998993 350 Goodwrench crate engine, Mexican made. cna code of ethics 2021