Small Block Chevy 350 20/30 Shift Bore 4.070 CH 1.250 Flat Top Head - Lefts & Rights (CP Bullets BCR1320-070)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block Bullet Special Race Series |
|
Part Number |
BCR1320-070 |
|
Bore (in) |
4.07 |
|
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 |
-6 |
|
Compression Ratio |
10.2 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.345 / SP |
|
Cubic Inch |
364 |
|
Piston Weight |
415 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
Yes |
| Product Name | Small Block Chevy 350 20/30 Shift Bore 4.070 CH 1.250 Flat Top Head - Lefts & Rights (CP Bullets BCR1320-070) |
|---|---|
| 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 bore clearance for the BCR1320-070 pistons?
For the BCR1320-070 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, it's crucial to verify this based on your specific engine build and operating conditions.
What compression ratio can I expect with the BCR1320-070 pistons?
The BCR1320-070 pistons provide a compression ratio of approximately 10.2:1 when used with 64cc cylinder heads. Ensure that your engine's overall setup supports this ratio for optimal performance.
What type of ring gaps should I set for the BCR1320-070 pistons?
The ring gaps for the BCR1320-070 pistons should be set according to the intended use of the engine. A common starting point is 0.020" for the top ring and 0.022" for the second ring, but adjust based on boost levels and RPM.
Are the BCR1320-070 pistons suitable for high RPM applications?
Yes, the BCR1320-070 pistons are designed for performance applications and can handle high RPMs. However, ensure proper machining, clearances, and tuning to maintain reliability at elevated RPMs.
What is the weight of the BCR1320-070 pistons and how does it affect performance?
The BCR1320-070 pistons weigh 415 grams each. This weight is suitable for performance applications, but keep in mind that lighter pistons can improve throttle response and reduce inertia. Balance the rotating assembly for best results.
