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400/428 Blocks
Pontiac V8 400/428 Blocks
The Big Family — 400/428 Blocks for Pontiac V8s
400/428 Block rings cover the most-built bore family in the Pontiac V8 world. Both engines share a 4.120" standard bore, so one ring range serves a stock 400 refresh at .030" over and a 4.191" stroker on the same page. The set is picked by finished bore, not by displacement.
Butler stocks Sealed Power moly-faced replacement sets from standard through .060" over, and a deep Total Seal range in Classic Race drop-in and file fit, gapless top and AP stainless top, plus a Mahle metric set.
Browse 400/428 Blocks Products
Items 1-21 of 21
Description: Piston Rings, Performance Series, 4.155 in Bore, File Fit, 1.0 x 1.0 x 2.0 mm Thick, Standard Tension, Steel, HV385 Thermal, 8-Cylinder, Kit
Item #: MAH-4160MS-112
Condition:
New
Price: $190.28
Description: Sealed Power (Speed-Pro) engine ring set for Pontiac 400/428 — .030" Over (4.150" bore). Cast moly-faced ring pack: 5/64" top, 5/64" second, 3/16" oil. Complete set for one V8.
Item #: SPR-E299K-030
Condition:
New
Price: $110.05
Description: Sealed Power (Speed-Pro) engine ring set for Pontiac 400/428 — .040" Over (4.160" bore). Cast moly-faced ring pack: 5/64" top, 5/64" second, 3/16" oil. Complete set for one V8.
Item #: SPR-E299K-040
Condition:
New
Price: $112.57
Description: Sealed Power (Speed-Pro) engine ring set for Pontiac 400/428 — .060" Over (4.180" bore). Cast moly-faced ring pack: 5/64" top, 5/64" second, 3/16" oil. Complete set for one V8.
Item #: SPR-E299K-060
Condition:
New
Price: $108.58
Description: Sealed Power (Speed-Pro) engine ring set for Pontiac 400/428 — Standard Bore (4.120" bore). Cast moly-faced ring pack: 5/64" top, 5/64" second, 3/16" oil. Complete set for one V8.
Item #: SPR-E299K-STD
Condition:
New
Price: $109.95
Description: 4.150 1/16 1/16 3/16 TS Classic Race Rings- DROP-IN (Set)
Item #: TSR-CR4150-DI
Condition:
New
Price: $167.93
Description: 4.155 ring 1/16 1/16 3/16 TS Classic Race Rings- File Fit, 4.150" oil ring (Set)
Item #: TSR-CR7560-25
Condition:
New
Price: $168.22
Description: 4.160 1/16 1/16 3/16 TS Classic Race Rings- File Fit (Set)
Item #: TSR-CR0690-35
Condition:
New
Price: $162.57
Description: 4.155 1/16 1/16 3/16 TS Classic Race Rings- DROP-IN (Set)
Item #: TSR-CR0690-30
Condition:
New
Price: $162.57
Description: 4.165 1/16 1/16 3/16 TS Classic Race Rings- File Fit (Set)
Item #: TSR-CR7560-35
Condition:
New
Price: $168.22
Description: 4.160 1/16 1/16 3/16 TS Classic Race Rings- Drop In (Set)
Item #: TSR-CR7560-30
Condition:
New
Price: $168.22
Description: 4.186 1/16 1/16 3/16 TS Classic Race Rings- File Fit (Set)
Item #: TSR-CR3455-35
Condition:
New
Price: $184.06
Description: 4.181 1/16 1/16 3/16 TS Classic Race Rings- DROP-IN (Set)
Item #: TSR-CR3455-30
Condition:
New
Price: $184.06
Description: 4.190 1/16 1/16 3/16 TS Classic Race Rings- File Fit (Set)
Item #: TSR-CR0690-65
Condition:
New
Price: $162.57
Description: 4.191 1/16 1/16 3/16 TS Classic Race Rings- Drop In (Set)
Item #: TSR-CR3455-40
Condition:
New
Price: $184.06
Description: 4.120 +5 1/16 1/16 3/16 TS Classic Race Rings- File Fit (Set)
Item #: TSR-CR1008-5
Condition:
New
Price: $179.96
Description: 4.160 1/16 1/16 3/16 TS Top Gapless Rings- File Fit (Set)
Item #: TSR-M0690-35
Condition:
New
Price: $381.57
Description: 4.186 1/16 1/16 3/16 TS Top Gapless Rings- File Fit (Set)
Item #: TSR-M3455-35
Condition:
New
Price: $381.57
Description: 4.155 (4.160" Ring) 1/16 1/16 3/16 TS w/AP Stainless Top (C-33 chrome nitride(CrN) coated)- File Fit (Set)
Item #: TSR-CS0690-35
Condition:
New
Price: $375.68
Description: 4.165 (4.170" Ring) 1/16 1/16 3/16 TS w/AP Stainless Top (C-33 chrome nitride(CrN) coated)- File Fit (Set)
Item #: TSR-CS0690-45
Condition:
New
Price: $375.68
Description: 4.181 (4.186" Ring) 1/16 1/16 3/16 TS w/AP Stainless Top (C-33 chrome nitride(CrN) coated)- File Fit (Set)
Item #: TSR-CS3455-35
Condition:
New
Price: $375.68
Items 1-21 of 21
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More About 400/428 Blocks
1. Stock replacement sizes
The Sealed Power Speed-Pro sets cover a straight rebuild on either block, each cut to a finished bore.
| Standard bore, 4.120" | For a block that honed clean. |
| .030" over, 4.150" | The most common rebuild size on a 400 or 428. |
| .040" over, 4.160" and .060" over, 4.180" | The next two steps up. |
| Ring pack | All of them use a 5/64" top, 5/64" second and 3/16" oil ring with a moly-faced top ring, sold as a complete set for one V8. |
2. Total Seal Classic Race, drop in or file fit
This is the widest bore coverage on the page, in a 1/16, 1/16, 3/16 pack that suits a modern forged piston.
| Drop in sets | Pre-gapped at 4.150", 4.155", 4.160", 4.181" and 4.191". |
| File fit sets | Supplied oversize so you set the gap, covering 4.120" to 4.123", 4.150", 4.155", 4.160", 4.180" to 4.181" and 4.185". |
| Which one | Drop in is fine for a mild street engine. File fit is the right answer any time boost, nitrous or sustained rpm is in the plan, because you choose the end gap. |
3. Gapless and stainless top rings
| Gapless top ring | Total Seal builds a gapless top ring set for 4.155" and for 4.180" to 4.181" bores in file fit. The gapless design closes the path blow-by normally takes past the top ring, which is why it turns up on engines chasing cylinder pressure. |
| AP stainless top | Total Seal sets with an AP stainless top ring, C-33 chrome nitride coated, in file fit at 4.155", 4.165" and 4.181". A tougher face for a harder duty cycle. |
| Mahle metric set | A 4.155" bore file fit set in 1.0, 1.0, 2.0mm, steel, standard tension, HV385 thermal. Butler notes this one is commonly found in Eagle rotating assembly kits with Mahle pistons, so check your kit before buying a second set. |
4. Getting the order right
| Ring thickness follows the piston | A stock or cast replacement piston is grooved for 5/64, 5/64, 3/16. A modern forged Pontiac piston is usually 1/16, 1/16, 3/16, and some are metric. The block does not decide this, the piston does. |
| Measure the finished bore | Butler's own note on these sets is to match the ring set to the finished bore, and to call if you do not know what the block came out at. |
| Oil ring size can differ | One Classic Race set for this family is listed with a 4.125" ring size and a 4.120" oil ring. Read the listing rather than assuming all three rings share a number. |
| Not seeing your size | Butler states it plainly on these listings. If the bore or ring thickness you need is not shown, they will either have it in stock or can get it. |
With this many sets on one page, the fastest route is to hand Butler the piston part number and the honed bore. That narrows twenty-odd options down to one.
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.