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)
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)
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)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1020-040 |
|
Bore (in) |
4.04 |
|
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 |
10.2 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.310 / SP |
|
Cubic Inch |
359 |
|
Piston Weight |
375 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.040 Bore,3.500 stroke, 6.000 rod 10.3 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-040) |
|---|---|
| Brands | CP Carrillo |
| Engine | SB Chevrolet / Holden |
| Make | GM |
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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 BCRS1020-040 pistons?
The BCRS1020-040 pistons are designed to achieve a compression ratio of approximately 10.2:1 when used with a 64cc cylinder head. Ensure that your engine's specifications align with this to optimise performance.
What type of valve reliefs do the BCRS1020-040 pistons have?
The BCRS1020-040 pistons feature two valve reliefs, which are essential for clearance with the valves in high-performance applications. Verify that your cylinder heads and camshaft profile are compatible.
What is the pin size and length for the BCRS1020-040 pistons?
The BCRS1020-040 pistons use a pin size of .927 inches and a length of 2.250 inches. Ensure that your connecting rods are compatible with these specifications for proper fitment.
What is the weight of the BCRS1020-040 pistons, and how does it affect engine performance?
Each BCRS1020-040 piston weighs 375 grams. Lighter pistons can improve engine response and reduce reciprocating mass, but ensure your engine is balanced correctly to maintain reliability.
What bore size is required for the BCRS1020-040 pistons?
The BCRS1020-040 pistons are designed for a bore size of 4.040 inches. It's crucial to ensure that your engine block is machined to this specification for optimal performance and fitment.
