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 USMTS 4.145 Bore, Stroke 3.875, 6.00 rod, 1.062 CH Vert Gas Ports 13.9:1 CR 1mm,1mm, 2mm rings - Lefts & Rights (CP Bullets BCRE1220-020)
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)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BCRS1020-060 |
|
Bore (in) |
4.06 |
|
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 |
10.3 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.310 / SP |
|
Cubic Inch |
362 |
|
Piston Weight |
381 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy IMCA/USRA Flat Top -4.95cc All 23 Heads 4.060 Bore,3.500 stroke, 6.000 rod 10.4 to 1 comp w/a 64cc head - Lefts & Rights (CP Bullets BCRS1020-060) |
|---|---|
| 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 compression ratio can I expect with the BCRS1020-060 pistons?
The BCRS1020-060 pistons provide a compression ratio of approximately 10.3:1 when used with a 64cc cylinder head. Keep in mind that actual compression may vary based on factors such as head gasket thickness and combustion chamber modifications.
What is the recommended bore clearance for these pistons?
For the BCRS1020-060 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, this can vary based on your specific engine build and operating conditions, so always consult your engine builder for precise specifications.
Do I need to modify my cylinder heads for these pistons?
The BCRS1020-060 pistons feature two valve reliefs designed for compatibility with all 23-degree heads. However, it's crucial to check for adequate clearance during assembly, especially if your heads have been modified or if you're using larger valves.
What is the piston weight of the BCRS1020-060 and how does it affect performance?
The BCRS1020-060 pistons weigh 381 grams. Lighter pistons can improve engine response and reduce reciprocating mass, but ensure that your connecting rods and crankshaft are rated for the intended RPM and power levels to maintain reliability.
What type of rings are included with the BCRS1020-060 pistons?
The BCRS1020-060 pistons come with a ring thickness of 1.2 x 1.2 x 3.0mm. It's essential to set the ring gaps according to your specific application and operating conditions for optimal performance and longevity.
