Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.040 Bore,3.500 stroke, 6.000 rod 10.3 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-040)
Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.060 Bore,3.500 stroke, 6.000 rod 10.4 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-060)
Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.060 Bore,3.480 stroke, 5.700 rod 10.3 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-060)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1021-060 |
|
Bore (in) |
4.06 |
|
Stroke (in) |
3.48 |
|
Rod Length (in) |
5.7 |
|
Comp Height |
1.56 |
|
Head Type |
All 23 deg heads |
|
Head CC |
64 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-4.95 |
|
Compression Ratio |
10.3 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.310 / SP |
|
Cubic Inch |
360 |
|
Piston Weight |
418 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's R/L |
|
Gas Port |
No |
| Product Name | Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.060 Bore,3.480 stroke, 5.700 rod 10.3 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-060) |
|---|---|
| Brands | CP Carrillo |
| Engine | SB Chevrolet / Holden |
| Make | GM |
Delivery & Freight
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What information do I need to match these pistons to my engine?
You need the engine code, bore size, stroke, rod length, pin diameter and target compression ratio. These determine the correct piston compression height and crown design.
How should ring gaps be set for these pistons?
Ring gaps must be set by your engine builder based on fuel type, boost level and the intended rpm range. Forced-induction engines usually require larger gaps.
Are forged pistons suitable for street engines?
Yes. Forged pistons handle detonation and high cylinder pressure better than cast units. Your builder should set the piston-to-bore clearance to suit your application.
What is the recommended compression ratio for the BCRS1021-060 pistons?
The BCRS1021-060 pistons are designed for a compression ratio of 10.3:1 when used with a 64cc cylinder head. Ensure that your engine's setup matches these specifications for optimal performance.
What type of valve reliefs do the BCRS1021-060 pistons have?
These pistons feature two valve reliefs on each side, designed to accommodate standard 23-degree cylinder heads. This allows for proper clearance with the valves during operation.
What is the weight of the BCRS1021-060 pistons?
Each BCRS1021-060 piston weighs 418 grams. It's important to consider this weight when balancing your rotating assembly to ensure smooth engine operation.
What is the pin size for the BCRS1021-060 pistons?
The BCRS1021-060 pistons use a pin size of .927 inches by 2.250 inches. Make sure your connecting rods are compatible with this pin size for proper fitment.
Are gas ports included in the BCRS1021-060 pistons?
No, the BCRS1021-060 pistons do not have gas ports. This design is typical for applications where gas porting is not required, such as in many racing and performance scenarios.
