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428 Stroker Rotating Assemblies
Pontiac V8 428 Stroker Rotating Assemblies
Stroke on Top of Stroke — 428 Stroker Rotating Assemblies for Pontiac V8s
A 428 stroker starts from a block that already has stroke, so the same crank that makes a 400 into a 461 puts a 428 in the mid-460s. That is the appeal of this shelf: big displacement without the extra bore a 400 would need to get there.
Butler carries Butler/Ross balanced rotating assemblies for the 428 block at 4.210" and 4.250" stroke, plus Eagle Competition and Street/Strip stroker kits at 461, 463 and 468 ci in flat top and -22cc dish.
Browse 428 Stroker Rotating Assemblies Products
Items 1-11 of 11
461-474 cu in Engine Builder Package / TEP w/RA 4.150-4.211" Bore / Ross Forged Piston / 4.250" str.
Description: Cast or Forged 4.250" Stroke 4.150-4.211 Bore Rotating Assembly
with Edelbrock RPM Heads (D Port or Rd Port Exhaust)
Comp Cam and Hyd Roller Top End Package
Kit for use with your block
BLOCK NOT INCLUDED
Item #: BPI-4250RA-TEP
Condition:
New
Ships in 4-6 weeks or sooner
Price: $8,450.00
Free Shipping!
Description:
Eagle Kit#52505
New Forged Crank 4.250" Stroke
.065" Over 428/.030" Over 455, 4.185" Bore, 468 cu.in.
Kit # 52505- Mahle -22cc Dish Top Pistons
6.800"...More Details »
Item #: EAG-52505-4185
Condition:
New
Price: $2,909.99
Description:
Eagle Kit # 52405-30 Mahle -22cc Dish Top Pistons
New Cast Crank 4.250" Stroke
.065" Over 428 4.185" Bore, 468 cu.in.
6.800" forged 4340 I-Beam rods...More Details »
Item #: EAG-52405-4185-428-FSI
Condition:
New
Price: $2,257.99
Description:
Eagle Kit # 52401-030 Kit with Crank Swap to 3.25" Mains
Mahle -22cc Dish Top Pistons
New Cast Crank 4.250" Stroke
.035" Over 428, 4.155" Bore, 468 cu.in....More Details »
Item #: EAG-52401-4155-x428-FSI
Condition:
New
Price: $2,321.95
Description:
Eagle Kit#51402
New Cast Crank 4.250" Stroke
.065" Over 428/.030" Over 455, 4.185" Bore, 463 cu.in.
Mahle -5cc Flat Top Pistons
6.800" forged 4340...More Details »
Item #: EAG-51402-4185-FSI
Condition:
New
Price: $2,581.99
Description:
Eagle Kit#51503
New Forged Crank 4.250" Stroke
.065" Over 428/.030" Over 455, 4.185" Bore, 468 cu.in.
Kit # 51503- Mahle -6cc Flat Top Pistons
6.800"...More Details »
Item #: EAG-51503-4185
Condition:
New
Price: $3,047.99
Free Shipping!
Description:
Choose Eagle Kit # 52413-030 Mahle -6cc Flat Top Pistons
New Cast Crank 4.250" Stroke
.065" Over on a 428/.035" Over on a 455
4.185" Bore, 468 cu.in.
6.800"...More Details »
Item #: EAG-52413-4185-FSI
Condition:
New
Price: $2,257.99
Description:
Eagle Kit#51502
New Forged Crank 4.250" Stroke
.065" Over 428/.030" Over 455, 4.185" Bore, 463 cu.in.
Mahle -22cc Dish Top Pistons
6.625" forged 4340...More Details »
Item #: EAG-51502-4185
Condition:
New
Price: $3,199.00
Description: Butler's balanced 456-463 ci long-rod stroker assembly for the Pontiac 428 block — a 4.210" stroke built around a true-Pontiac Ross forging and internally balanced in our shop. Nitrous-safe...More Details »
Item #: BPI-RA-4210-325-428
Condition:
New
Assemblies usually ship in 1-2 weeks with Ross .060 or Icon Pistons, Ross Custom 8-12 weeks
Price: $2,389.00
Description: Butler's balanced 460-467 ci long-rod stroker assembly for the Pontiac 428 block — a 4.250" stroke built around a true-Pontiac Ross forging and internally balanced in our shop. Nitrous-safe...More Details »
Item #: BPI-RA-4250-325-428
Condition:
New
Butler piston assemblies ship in 1-2 weeks
Price: $3,189.00
Description: Butler's balanced 460-467 ci long-rod stroker assembly for the Pontiac 428 block — a 4.250" stroke built around a true-Pontiac Ross forging and internally balanced in our shop. Nitrous-safe...More Details »
Item #: BPI-RA-460-467-428
Condition:
New
Usually ships in 1-2 Weeks
Price: $2,559.00
Items 1-11 of 11
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More About 428 Stroker Rotating Assemblies
1. The Butler assemblies
Both are long-rod, internally balanced packages built around genuine Ross forged pistons on Butler's exclusive true-Pontiac forging.
| 4.210" stroke, 456-463 ci | New cast or forged 4.210" crank, forged flat top or dish pistons, press-fit I-beam or bushed full-float H-beam 6.625" rods, 980 wrist pins, Total Seal Classic Race rings and Federal Mogul or Clevite Performance bearings. |
| 4.250" stroke, 460-467 ci, full custom | New cast or forged 4.250" crank, forged flat top Ross pistons with dish or dome available, bushed full-float H-beam 6.800" rods, 990 pins, Total Seal rings and rod bearings selected for proper clearance here. |
| 4.250" stroke, 460-467 ci, stocked bores | The same displacement built on a choice of 4.150", 4.155", 4.160" or 4.181" bore using custom Butler/Ross forged -8cc flat top pistons we keep in stock, or a custom dish milled in our shop. Offered in .030, .035, .040 and .060 over. |
| Engine builder package | A 461-474 ci rotating assembly and top-end package on a 4.250" stroke and 4.150-4.211" bore with Ross forged pistons, Edelbrock RPM heads and a Comp hydraulic roller cam, sized for 10.2-10.4:1 on 91-93 octane. Block not included; it is built for your block and your machinist. |
2. The Eagle kits and the shared 428/455 bore
Several Eagle kits on this page are listed for the 428 and the 455 together. That is a bore coincidence, not a licence to ignore the difference between the blocks.
| 4.185" bore | On a 428 that is .065" over; on a 455 it is only .030" over. Both land at the same displacement, but a .065"-over 428 has far less cylinder wall left. Sonic check before ordering. |
| 461 ci | A Street/Strip kit with -22cc dish pistons on a 4.250" stroke, listed specifically for the 428 block. |
| 463 ci | Flat top kits at a 4.185" bore, offered in Competition and Street/Strip. |
| 468 ci | The most common combination here — 4.185" bore on a 4.250" stroke, in flat top or -22cc dish, in both Competition and Street/Strip. |
3. Competition or Street/Strip
| Competition kits | Forged steel crankshaft, forged 4340 H-beam rods with 7/16" ARP 8740 capscrew rod bolts, forged 4032 Mahle pistons, plasma-moly file-fit rings and performance bearings, designed for internal balance with no heavy metal needed. |
| Street/Strip (FSI) kits | Cast steel crankshaft with Butler's exclusive forged 4340 FSI steel I-beam rods, described as lighter and stronger than 5140, with the same 7/16" ARP 8740 capscrew bolts, forged 4032 Mahle pistons and plasma-moly file-fit rings. |
| File-fit rings | All Eagle kits contain file-fit rings, so the gaps get set at the bench. |
4. Before you order
| Balancing | Every rotating assembly Butler sells must be balanced before installation, regardless of brand. Eagle kits ship unbalanced; Butler's shop balancing weighs and pin-fits the rods and pistons, computer balances the crank to the assembly and documents it on a balance card. |
| Neutral balance parts | Internally balanced assemblies require a neutral-balanced flexplate or flywheel and a neutral harmonic balancer. |
| Compression | On a Butler assembly the piston is designed to your chamber cc and target compression. Custom dish pistons run a 10 to 12 week lead time, so order the pistons early in the build. |
If your 428 is already at a common bore and you want a known combination quickly, an Eagle kit or the stocked-bore Butler assembly is the direct route. If the block is unusual or the compression target is specific, the full custom assembly is the one built for that.
Not sure what your Pontiac needs?
Call our tech team at 866-762-7527. Tell us your engine, heads, car, and power goal, and we will put the parts together as one combination that works.