What Spark Plugs Should I Run In My BluePrint Engine?

Proper spark plug gap is critical for ignition performance, idle quality, throttle response, and overall drivability.

Using an incorrect spark plug gap can result in:

• Misfires
• Hard starting
• Rough idle
• Loss of power
• Poor fuel economy

Small Block Chevy (SBC)

For BluePrint Small Block Chevy engines equipped with our standard ignition packages:

Recommended Spark Plug

NGK BKR5E

Spark Plug Gap

0.035"

Big Block Chevy (BBC)

For BluePrint Big Block Chevy engines equipped with our standard ignition packages:

Recommended Spark Plug

NGK BKR5E

Spark Plug Gap

0.035"

Small Block Ford

For BluePrint Small Block Ford engines equipped with our standard ignition packages:

Recommended Spark Plug

NGK BKR5E

Spark Plug Gap

0.035"

LS Engines

Spark Plug Gap

0.040"

Can I Run A Larger Gap?

A larger gap may be used with certain high-output ignition systems, but BluePrint recommends maintaining the specified gap unless directed otherwise.

Should I Check The Gap On New Spark Plugs?

Yes.

Spark plugs can be damaged during shipping and should always be checked before installation.

Frequently Asked Questions

My plugs are pre-gapped. Should I still check them?

Yes. Always verify the gap before installation.

Can an incorrect gap cause a misfire?

Yes. A plug gap that is too large or too small can cause ignition performance issues.

What happens if the gap closes up?

A smaller gap can reduce spark efficiency and combustion quality.