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- 400 Stroker Rotating Assemblies- up to 4.250 Stroke
400 Stroker Rotating Assemblies- up to 4.250 Stroke
Pontiac V8 400 Stroker Rotating Assemblies- up to 4.250 Stroke
The 461 Road — 400 Stroker Rotating Assemblies- up to 4.250 Stroke for Pontiac V8s
This is the busiest shelf in the Pontiac catalogue. A 400 block with a longer-stroke crank, matched rods and the right pistons is how most big-inch Pontiacs get built, and a 4.250" stroke in a 400 is the combination that made 461 and 468 cubic inches household numbers.
Butler carries both sides of it: Butler/Ross balanced rotating assemblies at 4.000", 4.210" and 4.250" stroke with custom-spec pistons, and Eagle Competition and Street/Strip stroker kits in fixed 461 and 468 ci combinations.
Browse 400 Stroker Rotating Assemblies- up to 4.250 Stroke Products
Items 1-14 of 14
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:
Choose Eagle Kit 51510- Mahle -22cc Dish Top Pistons
New Forged Crank 4.250" Stroke
.035" Over- 4.155" Bore, 461 cu.in.
6.800" forged 4340 H-Beam rods w/7/16" ARP...More Details »
Item #: EAG-51510-4155
Condition:
New
Price: $3,211.99
Description:
Choose Eagle Kit 51510- Mahle -22cc Dish Top Pistons
New Forged Crank 4.250" Stroke
.065" Over- 4.185" Bore, 468 cu.in.
6.800" forged 4340 H-Beam rods w/7/16" ARP...More Details »
Item #: EAG-51510-4185
Condition:
New
Price: $2,867.99
Description:
Choose Eagle Kit 52401- w/Mahle -22cc Dish Top Pistons for higher compression heads
New Cast Crank 4.250" Stroke
.035" Over- 4.155" Bore, 461 cu.in.
6.800" forged...More Details »
Item #: EAG-52401-4155-FSI
Condition:
New
Price: $2,321.95
Description:
Choose Eagle Kit 52401- w/Mahle -22cc Dish Top Pistons for higher compression heads
New Cast Crank 4.250" Stroke
.065" Over- 4.185" Bore, 467 cu.in.
6.800" forged...More Details »
Item #: EAG-52401-4185-FSI
Condition:
New
Price: $2,321.95
Description:
Eagle Kit 51500- Mahle -6cc Flat Top Pistons
New Forged Crank 4.250" Stroke
.035" Over- 4.155" Bore, 461 cu.in.
6.800" forged 4340 H-Beam rods w/7/16" ARP 8740...More Details »
Item #: EAG-51500-4155
Condition:
New
Price: $2,899.95
Description:
Eagle Kit 52410- w/Mahle -6cc Flat Top Pistons
New Cast Crank 4.250" Stroke
.035" Over- 4.155" Bore, 461 cu.in.
6.800" forged 4340 I-Beam rods w/7/16" ARP 8740 rod...More Details »
Item #: EAG-52410-4155-FSI
Condition:
New
Price: $2,310.99
Description:
Eagle Kit 51500- Mahle -6cc Flat Top Pistons
New Forged Crank 4.250" Stroke
.065" Over- 4.185" Bore, 468 cu.in
6.800" forged 4340 H-Beam rods w/7/16" ARP 8740...More Details »
Item #: EAG-51500-4185
Condition:
New
Price: $3,392.99
Description:
Eagle Kit 52410- w/Mahle -6cc Flat Top Pistons
New Cast Crank 4.250" Stroke
.065" Over- 4.185" Bore, 468 cu.in.
6.800" forged 4340 I-Beam rods w/7/16" ARP 8740 rod...More Details »
Item #: EAG-52410-4185-FSI
Condition:
New
Price: $2,310.99
Description: Butler's balanced 433-440 ci long-rod stroker assembly for the Pontiac 400 block — a 4.000" stroke built around a true-Pontiac Ross forging and internally balanced in our shop. Nitrous-safe...More Details »
Item #: BPI-RA-4000-300-400
Condition:
New
Custom piston assemblies ship in 9-10 weeks
Price: $3,999.00
Pontiac 455-462 ci Balanced Rotating Assembly Stroker Kit, Forged Piston, for 400 Block, 4.210" str.
Description: Butler's balanced 455-462 ci long-rod stroker assembly for the Pontiac 400 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-4210-300F-400
Condition:
New
Icon/DSS 3-4 weeks, Ross custom 9-10 weeks
Price: $2,879.00
Description: Turn a Pontiac 400 into a 460–467 with Butler's balanced long-rod stroker assembly. A 4.250" stroke with your choice of bore, built around a true-Pontiac Ross forging and internally...More Details »
Item #: BPI-RA-460-467-400
Condition:
New
Usually ships in 1-2 Weeks
Price: $2,559.00
Description: 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...More Details »
Item #: BPI-RA-460-467-400-UB
Condition:
New
Usually ships in 1-2 Days*
Price: $2,259.00
Description: Butler's balanced 460-468 ci long-rod stroker assembly for the Pontiac 400 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-4250-300-400
Condition:
New
Custom piston assemblies ship in 9-10 weeks
Price: $3,189.00
Items 1-14 of 14
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More About 400 Stroker Rotating Assemblies- up to 4.250 Stroke
1. The stroke options in this range
Three strokes sit under the 4.250" ceiling, and each one lands the 400 block somewhere different.
| 4.000" stroke, 433-440 ci | Butler's balanced long-rod assembly on a new forged 4.000" crank with bushed, full-float H-beam 6.700" rods and 990 pins. The mildest step up, and the stroke Butler recommends as the ceiling for 557-casting blocks. |
| 4.210" stroke, 455-462 ci | Built on a new forged Eagle 4.210" crank with press-fit or bushed full-float H-beam 6.625" rods, and Ross Custom or Keith Black Icon forged flat top or dish pistons. |
| 4.250" stroke, 460-468 ci | The main event. Available as a full custom assembly with the bore and ring type your call, or as a stocked 460-467 ci package in .030, .035, .040 and .060 over. |
2. Stocked bores versus full custom
The two Butler 4.250" assemblies look similar on the page and are not the same order.
| Stocked 460-467 ci | Built on a choice of 4.150", 4.155", 4.160" or 4.181" bore with custom Butler/Ross forged -8cc flat top pistons that we keep on the shelf, 6.800" full-float bushed rods, 990 pins, Total Seal Classic Race rings and bearings selected for clearance. Butler describes it as a proven base for a 500-plus hp carbureted or EFI muscle-car engine on pump gas. |
| Full custom 460-468 ci | Same architecture, but the bore, ring type and piston shape are open — flat top, dish or dome machined to the compression ratio you specify. This is the route when your block does not clean up at a stocked bore or your heads need a dish to land on pump gas. |
| Build Your Own | The same 4.250" matched kit supplied for you or your machinist to assemble, with balancing available separately. |
| Engine builder package | There is also a 461-474 ci top-end-plus-rotating-assembly package built on a 4.250" stroke and a 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. The block is not included — it is designed for your block and your machinist. |
3. Eagle Competition or Eagle Street/Strip
Eagle kits are fixed combinations at a set bore and displacement, and the two series differ in more than name.
| Competition | Forged steel crankshaft, forged 4340 H-beam rods with 7/16" ARP 8740 capscrew rod bolts, forged 4032 Mahle pistons and plasma-moly file-fit rings, performance bearings, designed for internal balance with no heavy metal needed. |
| Street/Strip (FSI) | Cast steel crankshaft with Butler's exclusive forged 4340 FSI steel I-beam rods — lighter and stronger than 5140 — 7/16" ARP 8740 capscrew bolts, forged 4032 Mahle pistons and plasma-moly file-fit rings. |
| The combinations | 461 ci at a .035"-over 4.155" bore and 468 ci at a .065"-over 4.185" bore, in flat top or -22cc dish, on a 4.250" stroke. |
| File-fit rings | All Eagle kits contain file-fit rings, so budget the bench time to gap them. |
4. What every assembly on this page still needs
| Balancing | Every rotating assembly Butler sells, regardless of brand, must be balanced before it is installed. Eagle kits are supplied unbalanced; Butler's in-house balancing weighs and pin-fits the rods and pistons, computer balances the crank to the assembly and ships a balance card with it. |
| Neutral balance parts | Internally balanced assemblies need a neutral-balanced flexplate or flywheel and a neutral harmonic balancer. |
| Casting check | Blocks with casting numbers ending in 557 should be held to 4.000" stroke and under 500 hp because of thinner main webbing. |
| Lead time | Custom dish pistons machined to a compression target run 10 to 12 weeks. Stocked flat tops ship far sooner. |
The short version: if your block cleans up at a common bore and you want a strong pump-gas street engine, the stocked 4.250" assembly or an Eagle kit will get you there quickly. If the bore, the chamber or the compression target is unusual, the full custom assembly is what it is for.
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.