engine and drivetrain ' 76 Spark Plug question

[Napes]

For NGK plugs are BP5ES plugs OK for an original ' 76 engine (higher 8.9:1 stock compression for automatics, though)? I use BP6ES in my new, higher compression engine, but thought the BP5ES might be better in my wife's car. It has a 32/36 Weber and tii exhaust, but is otherwise stock.

Thanks,

Bob Napier

[02for2]

IMSM, NGK plugs get hotter as the number values increase, so the BP5ES may actually be a better plug for your car.

There is no universal standard on plug heat ranges between manufacturers, though most are in the 85-100 degree range between ranges. In other words, a Bocsh, NGK or Champion #5 plug is not at all the same exact range.

Cheers!

[napa02]

On NGK the LOWER the number, the HOTTER the plug. BPR5ES would be a great choice...

[TobyB]

I've used 5's when I couldn't get 6's and I frankly noticed very

little difference. They were both good!

t

[Napes]

Thanks, Guys, I appreciate your thoughts. I had to get some stuff from AutohausAZ, so I had 'em throw in 4 NGKs (BP5ES) since the shipping was free (over $50).

Bob Napier

[JohnS]

BP5ES is close to the same heat range as the old Bosch W8DC plugs. BP6ES is close to the same heat range as Bosch W7DC. I use BP5ES in both of my tiis ('73 & '74) and my 3.0 csi. I stay away from the BPRxxx plugs because the R means it's a resistor plug. If you're using the stock wires with the resistor boot plug ends, you don't want the additional resistor in the spark plug too.

--John