Chevrolet SBC 350 - Flat Top, 2.020/1.600 valve milled head 357, Bore 4.030, CH 1.550, Stroke 3.500, Rod 5.700 (CP Pistons S1251)
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|
Make |
Chevrolet |
|
Engine Type |
SBC 350 - Flat Top, 2.020/1.600 valve milled head |
|
Part Number |
S1251 |
|
Bore (in) |
4.03 |
|
Stroke (in) |
3.5 |
|
Rod Length (in) |
5.7 |
|
Comp Height |
1.55 |
|
Dome / Dish Height |
F.T |
|
Dom/Dish CC |
-5 |
|
Pin |
.927 x 2.500 |
|
Ring Thickness |
.043 x .043 x 3.0mm |
|
VR Depth Int/Exh |
-.335 / SP |
|
Piston Weight |
416 |
|
Gas Port |
Yes |
|
Capacity |
357 |
|
Shlef (RPO) or Made to Order (MTO) |
MTO |
Stronger forging designed for 500 CFM two and four barrel applications; with dedicated right and left hand forgings; Suitable for angle milled heads; Accumulator grooves included as well as wrist pins and pin fitting at no cost; Double pin oilers; force fed from oil ring; Fully CNC machined. Notes: B - Supplied with Double Spiral Locks, C - .10 Deck Clearance with 3.480 Stroke, D - Rail Support included, E - Can be used with 3.750 Stroke & 6.000 Rod.
| Product Name | Chevrolet SBC 350 - Flat Top, 2.020/1.600 valve milled head 357, Bore 4.030, CH 1.550, Stroke 3.500, Rod 5.700 (CP Pistons S1251) |
|---|---|
| Brands | CP Carrillo |
| Engine | 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 S1251 pistons?
For the S1251 pistons, a typical bore clearance of 0.0035" to 0.0045" is advisable. This ensures proper thermal expansion and minimizes the risk of piston slap. Always verify with your specific engine setup.
Can I use the S1251 pistons with a 3.750 stroke crankshaft?
Yes, the S1251 pistons can be used with a 3.750 stroke crankshaft, provided you maintain the correct clearance and ensure that your connecting rods are compatible. This combination can yield a displacement of 357 cubic inches.
What type of ring gap should I use for the S1251 pistons?
For the S1251 pistons, a common starting point for ring gaps is 0.004" per inch of bore for the top ring and 0.005" per inch of bore for the second ring. Adjustments may be necessary based on your specific application and operating conditions.
Are the S1251 pistons suitable for high-performance applications?
Yes, the S1251 pistons are designed for high-performance applications, particularly in setups with 500 CFM carburetion. Their strong forging and features like gas ports and double pin oilers enhance durability and performance under load.
What is the weight of the S1251 pistons and how does it affect performance?
The S1251 pistons weigh 416 grams each. This weight is suitable for performance applications, as it balances strength and reciprocating mass. Lighter pistons can improve throttle response and reduce stress on the engine, but ensure that your engine is built to handle the associated RPMs.
