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The extensive line of big-block competition heads runs from conventional siamesed port BMF (Beat More Fords?) heads that accept traditional Chevy pattern intake manifolds and stud-mount rocker arms, to symmetrical port heads for 5.000-, 5.200-, and 5.300-inch-bore-space mountain motors.
14 Απρ 2019 · I researched the best head-porting tactics for small-block Chevy double-hump heads, and iron big-block Chevy rectangle-port heads. A quick search educated me that a set of later model Vortec heads are a better option.
16 Μαΐ 2022 · A short review over porting 781 big block chevy heads for larger valves....more.
3 Μαΐ 2013 · This is a Stage III.5 Port job on a set of Big Oval Port BBC heads casting 241. The beginning is combustin chamber mods in setting up for the 2.250 and 1.88 valve sizes.
14 Απρ 2014 · Two issues back, we subjected a 468-inch big-block Chevy to a variety of different oval-port cylinder heads, ranging from stock peanut-port-style heads to full.
Port Shape and Volume. This section quantifies a few major aspects of big-block heads, so you have better command of cylinder head decision making and can determine the best modifications to make. A number of prime elements concerning heads need to be dealt with.
Step 1. Gasket-match the intake and exhaust ports. This process is one of the simplest and most important porting procedures, which can add another five to 10 percent of flow at any valve lift. Place an old intake gasket on the head's intake port surface. Spray it with a light coat of white paint.
