Pontiac 460-467ci (.030, .035, .040, .060 over) Build Your Own Rotating Assembly Stroker Kit, for 400 Block, 4.250" str.

Our long-rod assemblies offer the ultimate in durability and performance.

Build your own Pontiac 460-467 ci stroker assembly for the 400 block. Choose your crank, pistons, and compression and we supply a matched 4.250" stroke kit for you or your machinist to assemble — balancing available separately.

What's Included

• New Cast or Forged Crank 4.250" Stroke
• Choose 4.150, 4.155, 4.160, 4.181" Bore
• Custom Butler/Ross Forged -8cc Flat Top Ross Pistons (stocked), or your choice of custom dish cc milled here in our shop
• Aftermarket 990 wrist pins
• Bushed/Full Float 6.800" rods
• Pin Fitted
• Total Seal Classic Race Rings with option for CS, or M Series
• Optional-Rod Bearings selected based on proper clearance- verified by our shop
• Optional shop services may extend lead times

Block note: Not recommended for blocks with casting numbers ending in 557 — we suggest limiting those to 4.000" stroke and under 500 hp due to thinner main webbing.

Choose Your Options

• Crankshaft — Cast or Forged. New cast steel cranks are an excellent, affordable upgrade over a 30+ year-old factory crank (great for street engines without power adders). Step up to a 4340 forged crank for maximum strength and durability — cheap insurance that leaves the door open to add power later.
• Bore. We start bore options at .030" over so the block cleans up and the pistons and rings seat within spec. Larger bores are available. We recommend having the pistons in hand when the cylinders are honed to set piston-to-wall clearance off the actual parts.
• Pistons — Flat Top or Custom Dish. Butler/Ross forged pistons on our exclusive true-Pontiac "strut-style" forging — some of the lightest, strongest pistons available, and nitrous-safe. Choose a flat top or a custom dish machined to your target compression ratio.
• Compression Ratio. Tell us your heads and desired compression; our techs work with Ross to design the piston to hit it. Custom dish pistons run a 10–12 week lead time.
• Rings. Total Seal, standard on all assemblies. Classic Race (CR) plasma-moly; upgrade to AP Advanced Stainless (CS) for longer life and tighter tolerance, or Gapless Top (M) to seal cylinder pressure between the top and second rings.
• Wrist Pins. Standard Ross 5115 chromoly pins are rated to 800 hp naturally aspirated; upgrade to .220" wall bearing-steel pins for higher-horsepower and power-adder builds.
• Rods & Rod Bolts. 4340 forged H-beam or I-beam rods, full-floating and bushed. Standard ARP8740 bolts (190,000 psi); upgrade to ARP2000 (220,000 psi).

Bearings & Clearance

Bearings are included. Rod-bearing clearance is checked and verified in our shop at no charge. Main-bearing clearance depends on your crank journal size, bearing brand, and finished main-bore size — it can't be verified here because it has to be torqued into your block — but we'll gladly swap for -1 or X bearings (in new condition) if you need them. We recommend having the crank and main bearings in hand when the mains are machined.

Build Your Own — Supplied as a Kit

This is our build-your-own version: the same quality matched components at a lower price, supplied for you or your machinist to assemble. Internal balancing is not included — add our in-house balancing service or have it balanced by your builder. These are internally balanced designs and require a neutral-balanced flexplate/flywheel and harmonic balancer once balanced.