331 Vs. 347 Stroker 

Is there a Difference?
Is one better than the other?
Is bigger Better?

331 STROKER -    (4.030 X 3.25 Stroke)

347 STROKER -     (4.030 Bore x 3.40 Stroke)

When doing an "Apples to Apples" comparison of the two engines with similar Compression, Camshaft profiles and other components they perform very similar. On a technical standpoint there are a few difference between the two. We've had great luck with both engines. 

331 :

• Lightweight and Quick Revving .  Increased Bottom End Torque over 302.
• Improved internals over factory 302. (Forged Connecting Rods and Pistons)
• Same Dimensions as 302.  If already have a 302 existing Headers, brackets ect. will work.
• An increase of 60-70lbs. extra Torque Potential over factory 302 engine ( when built properly)
• Slightly better Connecting Rod Length than the 347. Meaning less cylinder Wall Stress.

347:

• Lightweight and Quick Revving. Increased Bottom End Torque over 302.
• Improved internals over factory 302. (Forged Connecting Rods and Pistons)
• Same Dimensions as 302.  If already have a 302 existing Headers, brackets ect. will work.
• An increase of 70-80lbs. extra Torque Potential over factory 302 engine ( when built properly)
• Increased Rod Angle on cylinder wall than the 331.
• Slightly more Torque Capacity than the 331 stroker
• Piston Pin intersects with Oil Ring with some manufacturer pistons.  This has been addressed   by Piston Manufacturers and slight changes in Rod lengths.

VIEW OUR ENGINE PACKAGES HERE

More Tech info

Our sales Staff can assist you in making a final decision. 

1-800-704-5385