A 4.060″ bore and a 3.000″stroke is approximately 311 cubic inches.
Q. What is a 302 engine bored 30 over?
It means that each cylinder was bored . 030 or 30 thousandths of an inch more than the stock measurement. It actually makes it larger than a 302. It will affect things if you ever have to rebuild again.
Table of Contents
- Q. What is a 302 engine bored 30 over?
- Q. How much can I bore a 302?
- Q. What does it mean to bore an engine 30 over?
- Q. Does a longer stroke mean more torque?
- Q. How do you know if you’re a Rebore?
- Q. Can you put oversized rings on a standard piston?
- Q. How do I know if I need oversized piston rings?
- Q. What happens if piston ring gap is too big?
- Q. Do OEM piston rings need to be gapped?
- Q. What should the piston ring gap be?
Q. How much can I bore a 302?
Stock 302 blocks can go to about 360 CI. But that’s an extreme bore (4.060″) and an extreme stroke (3.500″).
Q. What does it mean to bore an engine 30 over?
When a block has been bored .030 over it usually means it’s been rebuilt once, but not always. It also adds cubic inches to the displacement, a 350 bored .030 over is 355 CI.
Q. Does a longer stroke mean more torque?
Instead, long-stroke engines produce higher torque at lower RPMs. For example, the Sportster produces 73.2 Nm of maximum torque at 3,750 RPM, while the Street Triple produces 78.6 Nm at 9,350 RPM. A longer-stroke cylinder usually has a narrower combustion chamber.
Q. How do you know if you’re a Rebore?
Reboring an engine is necessary when the cilinder is:
- Damaged more than honing can resolve: So deep scratches, marks, etc. For scratches, usually if your fingernail grips in it, it is too deep.
- Un-round, or oval: This can be cuased by overheating.
- Flat spots in the cilinder wall.
- Out of specification in Diameter.
Q. Can you put oversized rings on a standard piston?
Oversize rings are for oversize pistons. They will not work on STD pistons. If you bore it .
Q. How do I know if I need oversized piston rings?
For instance a 4″ ring should have a minimum gap of . 014″. Ring gap of more than . 008″ per inch of cylinder bore indicates an oversize cylinder and oversize rings may want to be considered.
Q. What happens if piston ring gap is too big?
Onto piston ring gaps. And if it’s really tight, it can even break a piston. Now, if the gap is too big, the engine will have too much crankcase pressure, have a ton of blow-by, burn oil, and lack proper cylinder sealant.
Q. Do OEM piston rings need to be gapped?
Since OEM applications are designed to an exact power output, heat, lifecycle, and emission compliance, they run a tighter second ring end gap.” Per DiBlasi, “We recommend a larger second ring end gap than the top ring for performance and racing engines since they see a wider range of power and heat than OEM.
Q. What should the piston ring gap be?
Most piston ring manufacturers recommend a minimum end gap of . 004 inches times the bore diameter for the top piston compression ring. So for a 4 inch bore, the standard end gap would be . 016 inches.
