455 Pistons

Pontiac V8 455 Pistons

Where the Cubic Inches Get Paid For — 455 Pistons for Pontiac V8s

The 455 is the biggest factory Pontiac V8, and the piston is what decides whether it comes back as a torque-heavy street engine on pump gas or a 500-plus horsepower stroker. Bore, crown volume, compression height and cylinder head chamber all have to land together — the 455 piston is where those four meet.

Butler stocks this category deep: Butler Ross Quick Ship forged flat tops and dish tops, Icon forged 2618, DSS FX series forged, and Keith Black hypereutectic cast, in standard bore and .030", .040" and .060" over, plus fully custom Ross and DSS sets.

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DSS 1-FX Forged Piston and Ring Kit, Pontiac 400, 4.375" Str., 4.180" Bore, -7cc Flat Top, Set/8, DSS-K1-6140-4180

Overbore sets	Icon and Keith Black both catalogue in standard, .030", .040" and .060" over. On the Keith Black and Icon lines that works out to a 4.180" bore at .030", 4.190" at .040" and 4.210" at .060".
Butler Ross Quick Ship bores	The Ross sets Butler stocks as Quick Ship are cut at 4.160", 4.181", 4.191" and 4.211", which lets you match a specific finished hone size rather than a nominal overbore step.
Measure after honing	Order the piston to the bore you have, and if the block has not been cut yet, talk to whoever is doing the machine work before you buy. Pistons ordered against an intended bore are the most common return we do not accept — custom pistons are not returnable.

Keith Black hypereutectic	A high-silicon 390 alloy with 16 percent silicon, diamond-machined skirt, spiral lock rings, and press-fit or bushed pin capability. Butler's own copy calls it a great-value cast piston for stock-to-street rebuilds — it runs tight, runs quiet, and costs less than forged.
Icon forged	2618 forged aluminum with a diamond-machined skirt, head, mini-grooves, pin bore, gas accumulator and ring grooves, pressure-drilled pin hole oiling, and a V-rib design for light weight and piston cooling. Butler notes the Icon forging is much lighter than the old Federal Mogul/TRW piston, and the pin is lighter too.
DSS FX series	2618 alloy with two large valve reliefs, a full floating pin with double True Arc pin locks, and the patented X Groove skirt.
Ross	Butler's house forged piston for the 455, stocked as Quick Ship sets in flat top and dish and available fully custom in any bore, stroke and crown.

Flat top	Icon's flat top carries a -5.5cc valve pocket. Against a 71cc chamber that is 12.1:1, against 87cc it is 10.3:1, and against 96cc it is 9.6:1. Keith Black's flat top is -6cc and is designed for 14-degree heads, 1967 and later.
Dish	Icon's D-shaped dish is -15cc, which lands at 11.0:1 on a 71cc chamber, 9.5:1 on 87cc and 8.9:1 on 96cc. Keith Black's deep -30.5cc dish is designed for 14-degree and 20-degree heads and is the one for a low-compression pump gas build.
Dome	Keith Black's dome is 0cc effective with a .265" dome height, designed for 14-degree heads, 1967 and later.
Dish range on the Ross sets	The Butler Ross Quick Ship dish tops are catalogued across a 16 to 42cc dish range, which is how you dial a specific compression target against a known chamber.

4.210" stroke	The factory 455 stroke. DSS lists 1.480" compression height, .980" pins and a 6.625" rod length for this one. Icon's 4.210" data gives 1.490" compression height on a 6.630" rod with a .9805" pin against a 10.250" OE deck height.
4.250" stroke	DSS drops to 1.285" compression height, .990" pins and a 6.800" rod length. Butler stocks Ross Quick Ship sets at this stroke in four bores.
4.500" stroke	DSS goes to 1.160" compression height, .990" pins and 6.800" rods. This is deep-stroker territory and the piston is a different part, not a variation.
Order the assembly together	Crank stroke, rod length and compression height are one equation. Buying them separately over months is how people end up with pistons out of the hole.

DSS FX 455 pistons	Butler's copy states these fit late model and Edelbrock Pontiac heads only. If you are running early heads, this is not your piston.
Icon	The Icon notes specify a centered pin and use with OE or Edelbrock style heads.
Keith Black	The flat top and dome are listed for 14-degree heads, 1967 and later; the deep dish is listed for 14-degree and 20-degree heads.
Chamber cc is the number to have	Every compression figure above is quoted against a chamber volume. Cc the heads or get the figure from the manufacturer before you choose a crown.

Stock cast rods may need work	Both the Icon and DSS 4.210" stroke sets carry the same warning — stock cast rods may need to be narrowed and the balance pad removed to clear the inside of the pistons.
Keith Black ring gap	Keith Black hypereutectic pistons require a much wider top ring end gap than traditional forged pistons. The KB spec is .0065" per inch of bore for a street engine. Gap a KB piston like a forged one and you will pinch a ring.
Ring sizes differ by line	The Icon and DSS forged sets specify a 1/16", 1/16", 3/16" ring package, while the Keith Black sets call for 5/64", 1/16", 3/16". Order the rings to the piston.
Early 400 blocks with deep notches	Butler stocks Ross flat tops built with an offset ring support specifically for early 400 blocks with deep notches, and for nitrous and boost applications, at 4.250" and 4.500" stroke on a 4.181" bore.
Pins and locks	Icon pistons come with pin locks so they can be used with bushed or press-fit rods. DSS ships full floating pins with double True Arc locks.

Ross custom	Any bore, any stroke, flat, dish or dome, built to your combination as a set of eight.
DSS custom	2618-T6 forging, dish or flat top, any stroke and up to a 4.200" bore, with your choice of rings and pins specified on the order.
Balancing	Every rotating assembly Butler sells, regardless of brand, is balanced in Butler's shop. Rods and pistons are weighed and pin fitted, the crank is computer balanced to the rest of the assembly, and a balance card with all the weights ships with it.

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