Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.035 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-035)
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 4.040 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-040)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1021-040 |
|
Bore (in) |
4.04 |
|
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 |
10.2 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.310 / SP |
|
Cubic Inch |
357 |
|
Piston Weight |
417 |
|
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 4.040 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-040) |
|---|---|
| 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 BCRS1021-040 pistons?
The BCRS1021-040 pistons are designed to achieve a compression ratio of 10.2:1 when used with a 64cc cylinder head. Ensure that your engine's configuration and fuel quality support this compression for optimal performance.
What type of valve reliefs do the BCRS1021-040 pistons have?
These pistons feature two valve reliefs on both the left and right sides, accommodating standard valve clearance requirements for Small Block Chevy applications.
What is the piston weight of the BCRS1021-040 pistons?
The BCRS1021-040 pistons weigh 417 grams each. This weight is suitable for high-performance applications, but ensure your rotating assembly is balanced accordingly.
Do the BCRS1021-040 pistons require any specific machining?
Yes, the BCRS1021-040 pistons may require specific bore clearance and ring gap settings as determined by the engine builder. Always check the fitment in your engine block and adjust as necessary.
What is the pin size for the BCRS1021-040 pistons?
The BCRS1021-040 pistons use a pin size of .927 inches with a length of 2.250 inches. Ensure your conrods are compatible with these specifications for proper fitment.
