Small Block Chevy Flat Top -7.1cc All 23 Heads 4.155 Bore,4.000 stroke, 6.000 rod 12.1 to 1 comp with a 64cc head (CP Bullets BC1110-030)
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 4.000 Bore,3.500 stroke, 6.000 rod 10.1 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-STD)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1020-STD |
|
Bore (in) |
4 |
|
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 |
352 |
|
Piston Weight |
365 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.000 Bore,3.500 stroke, 6.000 rod 10.1 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-STD) |
|---|---|
| Brands | CP Carrillo |
| 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-STD pistons?
The BCRS1020-STD pistons are designed for a compression ratio of 10.1:1 when used with 64cc cylinder heads. Ensure that your engine's specific configuration aligns with this ratio for optimal performance.
What are the specific machining requirements for the BCRS1020-STD pistons?
When installing BCRS1020-STD pistons, ensure that the bore clearance is set correctly. Typical clearance for a performance application is around 0.0035” to 0.0045”, but this can vary based on your engine's specific tolerances and operating conditions.
What is the weight of the BCRS1020-STD pistons, and how does it affect engine performance?
The BCRS1020-STD pistons weigh 365 grams each. Lighter pistons can improve engine response and RPM potential, but it's crucial to balance them with the rest of the rotating assembly to avoid vibrations and ensure reliability.
Do the BCRS1020-STD pistons require any specific ring types?
The BCRS1020-STD pistons are designed to work with a ring set of 1.2 x 1.2 x 3.0mm thickness. Ensure that the rings are properly gapped and installed to prevent blow-by and maintain compression.
What type of valve reliefs do the BCRS1020-STD pistons have?
The BCRS1020-STD pistons feature two valve reliefs, which are essential for clearance with the valves in high-performance applications. Ensure that your cylinder heads and camshaft profile are compatible to avoid interference.
