Small Block Chevy 405ci Most 23° Bore 4.145 CH 1.125 Stroke 3.750 Rod 6.000 CR 12.7 Dome Head 64 (CP Bullets BC1200-020)
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|
Make |
Chevrolet |
|
Engine Type |
Small Block |
|
Part Number |
BC1200-020 |
|
Bore (in) |
4.145 |
|
Stroke (in) |
3.75 |
|
Rod Length (in) |
6 |
|
Comp Height |
1.125 |
|
Head Type |
All 23 deg |
|
Head CC |
64 |
|
Dome / Dish Height |
0.235 |
|
Dom/Dish CC |
5.1 |
|
Compression Ratio |
12.8 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
1.5 x 1.5 x 3.0mm |
|
VR Depth |
-.310 / -.310 |
|
Cubic Inch |
405 |
|
Piston Weight |
447 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Chevy 405ci Most 23° Bore 4.145 CH 1.125 Stroke 3.750 Rod 6.000 CR 12.7 Dome Head 64 (CP Bullets BC1200-020) |
|---|---|
| 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 BC1200-020 pistons?
For the BC1200-020 pistons, a typical bore clearance of 0.0030" to 0.0035" is recommended. However, always verify with your specific engine build and intended use.
What compression ratio can I expect with the BC1200-020 pistons?
The BC1200-020 pistons provide a compression ratio of approximately 12.8:1 when used with 64cc cylinder heads. Ensure your fuel quality and tuning are suitable for this compression level.
What type of valve reliefs do the BC1200-020 pistons have?
The BC1200-020 pistons feature two valve reliefs, which are designed to accommodate typical valve sizes in 23-degree small block heads. Always check clearance with your specific camshaft and valve train setup.
What is the weight of the BC1200-020 pistons and how does it affect performance?
The BC1200-020 pistons weigh 447 grams. While lighter pistons can improve engine response and reduce rotating mass, ensure that your connecting rods and crankshaft are rated for this weight.
Do I need to machine the pistons for my specific application?
Machining may be required depending on your engine's bore size and the specific tolerances of your build. Always check for proper fitment and clearances before installation.
