Big Block Chevy 538ci 4.625 Bore 1.245 CH 13.8:1 CR (CP Bullets BBCRE5321-125)
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|
Make |
Chevrolet |
|
Engine Type |
Big Block |
|
Part Number |
BBCRE5321-125 |
|
Bore (in) |
4.625 |
|
Stroke (in) |
4 |
|
Rod Length (in) |
6.535 |
|
Comp Height |
1.245 |
|
Head Type |
BB3 Xtra / Head Hunter |
|
Head CC |
118 |
|
Dome / Dish Height |
0.65 |
|
Dom/Dish CC |
46.9 |
|
Compression Ratio |
13.8 |
|
Pin |
.990 x 2.750 |
|
Ring Thickness |
.043 x .043 x 3.0 |
|
VR Depth |
-.310 / .100 |
|
Cubic Inch |
538 |
|
Piston Weight |
710 |
|
Style |
Dome |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
Yes |
| Product Name | Big Block Chevy 538ci 4.625 Bore 1.245 CH 13.8:1 CR (CP Bullets BBCRE5321-125) |
|---|---|
| Brands | CP Carrillo |
| Engine | Big Block Chev |
| 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 bore clearance for the BBCRE5321-125 pistons?
For the Big Block Chevy BBCRE5321-125 pistons, a typical bore clearance is around 0.0035" to 0.0040". However, this can vary based on your specific engine build and operating conditions, so it's best to consult with your engine builder for precise measurements.
What type of fuel is recommended for the 13.8:1 compression ratio of these pistons?
With a compression ratio of 13.8:1, these pistons are best suited for high-octane race fuel or E85 to prevent detonation. Ensure your engine is tuned properly to match the fuel type for optimal performance and reliability.
Do I need to modify my cylinder heads for the BBCRE5321-125 pistons?
Depending on your specific cylinder head design and valve sizes, you may need to check for clearance with the 2 valve reliefs on the BBCRE5321-125 pistons. Ensure that your heads are compatible and that there is adequate clearance during the engine assembly.
What is the significance of the gas ports on these pistons?
The gas ports on the BBCRE5321-125 pistons help improve ring seal and reduce blow-by by allowing combustion gases to pressurise the ring pack. This feature is particularly beneficial in high-performance applications where maintaining optimal cylinder pressure is critical.
What is the piston weight and how does it affect engine performance?
The BBCRE5321-125 pistons weigh 710 grams. While lighter pistons can improve engine response and reduce reciprocating mass, ensure that your rotating assembly is balanced properly to accommodate this weight for optimal performance and reliability.
