Small Block Ford Flat Top -4.7cc GT40 4.030 Bore, 3.500 stroke, 6.200 rod 11.2 to 1 Comp with 58cc head (CP Bullets BFRS6070-030)
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|
Make |
Ford |
|
Engine Type |
Small Block |
|
Part Number |
BFRS6070-030 |
|
Bore (in) |
4.03 |
|
Stroke (in) |
3.5 |
|
Rod Length (in) |
6.2 |
|
Comp Height |
1.53 |
|
Head Type |
GT40/ 351W |
|
Head CC |
58 |
|
Dome / Dish Height |
FT |
|
Dom/Dish CC |
-4.7 |
|
Compression Ratio |
11.2 |
|
Pin |
.927 x 2.250 |
|
Ring Thickness |
1.2 x 1.2 x 3.0mm |
|
VR Depth |
-.285 / SP |
|
Cubic Inch |
357 |
|
Piston Weight |
425 |
|
Style |
FT |
|
Valve Reliefs |
2 VR's |
|
Gas Port |
No |
| Product Name | Small Block Ford Flat Top -4.7cc GT40 4.030 Bore, 3.500 stroke, 6.200 rod 11.2 to 1 Comp with 58cc head (CP Bullets BFRS6070-030) |
|---|---|
| Brands | CP Carrillo |
| Engine | Ford V8, Small Block Ford |
| Make | Ford |
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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 BFRS6070-030 pistons?
For the BFRS6070-030 pistons, a typical bore clearance of 0.0015" to 0.0025" is recommended. However, this can vary based on the specific application and operating conditions, so always consult with your engine builder.
What compression ratio can I expect with the BFRS6070-030 pistons and 58cc GT40 heads?
With the BFRS6070-030 pistons and 58cc GT40 heads, you can expect a compression ratio of approximately 11.2:1. This assumes a standard deck height and other typical parameters, but actual results may vary based on machining and assembly.
What type of ring set should I use with the BFRS6070-030 pistons?
The BFRS6070-030 pistons use a 1.2 x 1.2 x 3.0mm ring set. Ensure that the rings are compatible with your application and properly gapped according to your engine's specifications.
Do I need to modify the BFRS6070-030 pistons for valve clearance?
The BFRS6070-030 pistons come with two valve reliefs designed for use with typical cam profiles in Small Block Ford engines. However, it's advisable to check for clearance with your specific setup, especially if using aftermarket camshafts.
What is the weight of the BFRS6070-030 pistons, and how does it affect my build?
The BFRS6070-030 pistons weigh 425 grams each. This weight is suitable for performance applications, but be mindful of the overall rotating assembly balance, as heavier pistons can affect engine dynamics and RPM capabilities.
