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WebOct 8, 2010 · Located in two different spots- on 738 455's, and the early 400/430 it was here, on the passenger side of the front of the engine, next to the timing cover. On 861 71's and later blocks, it's in the lifter valley. That's all for block ID.. the next post in this thread will cover basic block inspection and prep for the machine shop. WebSep 3, 2024 · The bottom line is that production cylinder heads are designed for a compromise between good performance and easy manufacturing. As a result, they almost always leave room for improvement on the performance side—it’s very hard to cast the perfect port in a high-volume production environment. Enter the port and polish job. WebDec 19, 2024 · Fox Body Mustang Cylinder Heads. Trick Flow Cylinder Head Twisted Wedge 11R 190cc Intake 2.055/1.60 Valves Dual Springs 56cc Chambers Street Port 289/302/351W. $1,364.99. SEE DETAILS. AFR Cylinder Head Aluminum 220cc Intake 7/16" Stud 72cc Chambers Without EGR Pair 289/302/351W. $2,788.42. ina beam