Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.030 Bore,3.480 stroke, 5.700 rod 10.2 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1021-030)
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 4.030 Bore,3.500 stroke, 6.000 rod 10.3 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-030)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1020-030 |
|
Bore (in) |
4.03 |
|
Stroke (in) |
3.5 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.25 |
|
Head Type |
All 23 deg heads |
|
Head CC |
64 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-4.9 |
|
Compression Ratio |
10.1 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.310 / SP |
|
Cubic Inch |
357 |
|
Piston Weight |
372 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.030 Bore,3.500 stroke, 6.000 rod 10.3 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-030) |
|---|---|
| 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 BCRS1020-030 pistons?
The BCRS1020-030 pistons are designed to achieve a compression ratio of approximately 10.3:1 when used with a 64cc cylinder head. However, actual compression may vary based on the specific engine setup and machining tolerances.
What type of ring thickness is used with the BCRS1020-030 pistons?
These pistons utilise a ring thickness of 1.2mm for the top and second rings, and a 3.0mm oil ring. Ensure that the ring gaps are set according to your specific application and engine conditions.
Do the BCRS1020-030 pistons require any special machining?
Yes, the BCRS1020-030 pistons may require specific bore clearances and ring gap settings as determined by the engine builder. Always verify the fitment with your engine's specifications and machining practices.
What is the weight of the BCRS1020-030 pistons?
Each BCRS1020-030 piston weighs approximately 372 grams. This weight should be considered when balancing the rotating assembly for optimal performance.
Are there any specific applications for the BCRS1020-030 pistons?
The BCRS1020-030 pistons are designed for Small Block Chevrolet engines, specifically for use in IMCA and USRA racing applications. They are suitable for high-performance builds but require careful attention to machining and tuning for reliability.
