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GM Performance Engine Block, Cast Iron, 4-Bolt Mains, 4.000 in. Diameter Bore, 2-Piece Rear Main
Part Number:GMP-12480049
GM Performance Engine Block, Cast Iron, 4-Bolt Mains, 4.000 in. Diameter Bore, 2-Piece Rear Main Seal, Chevy, 350, Each (PART #GMP-12480049)
These GM Performance 350 c.i.d. cast iron racing Bowtie bare engine blocks are CNC-machined from raw castings. All traditional racing modifications are provided by the factory. The heart of these blocks starts with a 3.980-4.155 in. Siamese bore cylinder case. In addition, all galleries required for dry sump oil system operation are drilled and tapped for pipe. 8620 steel bearing caps are installed on all locations of the blocks. The intermediate main bearing caps have the outer 7/16 in. diameter studs on the inner locations, and 3/8 in. diameter straight bolts on the outer locations. The rear bearing cap is a 2-stud (7/16 in. diameter) configuration and utilizes a 2-piece rear seal design. After the installation of the steel bearing caps, the blocks are align bored.
Additional features include:
- Priority main oiling
- Enlarged lifter bosses
- Bearing cap inner bolts spread .210 in. to allow use of 2.65 in. diameter journal cranks on properly modified blocks
- Early model 2-piece rear main seals
- Sonic bore check (data provided)
- Use 1985 and earlier oil pans
- Enlarged cam bosses in front and rear allow use of larger bearings
- Use premium quality studs and 8620 200 steel splayed main bearing caps
SPECIFICATIONS |
|
| Brand | GM Performance |
| Manufacturer's Part Number | 12480049 |
| Part Type | Engines, Bare Blocks |
| Product Line | GM Performance 350 C.I.D. Cast Iron Racing Bowtie Bare Engine Blocks |
| Main Journal Type | Chevy 400 |
| Engine Block Material | Cast iron |
| Engine Block Style | OEM |
| Engine Block Deck Height | Standard deck |
| Deck Height (in.) | 9.025 in. |
| Cylinder Bore as Shipped | 3.980 in. |
| Cylinder Bore Diameter | 4.000 in. |
| Maximum Bore Diameter (in.) | 4.155 |
| Camshaft Location | Standard |
| Engine Block Weight (lbs.) | 180 lbs. |
| Main Bolt Style | 4-bolt |
| Main Caps Included | Yes |
| Main Cap Material | Ductile iron |
| Main Cap Fasteners Included | Yes |
| Main Bearings Included | No |
| Rear Main Seal Style | 2-piece |
| Finished Cylinder Bores | No |
| Raised Cam Location | No |
| Cam Bearings Included | No |
| Freeze Plugs Included | No |
| Remanufactured | No |
| Quantity | Sold individually. |
| Notes | 3.980 in. finished bore. 4.155 in. max bore (siamese cylinder bores). |
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