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Spark Plugs and Gaps 1976 190

Re: Spark Plugs and Gaps

I'm going to throw something into the mix here, and with no disrespect to either of you.

I love forums and the information that we can both gain and contribute......, however, I think it is always best to find this type of data in your OEM manual for YOUR engine, as to reduce the risk of getting the wrong components. I believe that torque specs, timing specs, spark plugs (and several others) all fall into this category!
Everyone means well, but we could misinterpret a portion of this, and inadvertently cost someone a failure!

There is always a chance that a PO (previous owner) has changed engines/cylinder heads, etc. on any pre-owned vessel. This may mean that spark plug "A" that works for Billy-Bob, may not be correct for Billy-Jack. Spark plug "B" may be required.
Point being, you may want to verify that the engine is OEM (and you may very well know this) so that you purchase the correct plugs for it.
If you cannot, then verify via the cylinder head casting number... and then double check the heat range.
This may not be such an issue with the SBF as it may be with the SBC.

Also, an ignition system is part of the mix in determining spark plug gap.
If yours has been changed, you may have a higher output system and your gap can be increased some from .030", for example.
If it is standard, then the .030" may be correct.

Again, no disrespect here.... NW Redneck's suggestion may be Dead ON!

Just Food for Thought.:)
 
Re: Spark Plugs and Gaps

Ricardo,
For most things you are dead on except the spark plug gap by the owners manual on vintage crafts. If you look up correct plugs today I bet they will say gap is .035 whereas .030 was in the owners manual. The increase in gap is due to fuel formulation changes in the early 90's allowing for more gap which equals better power/economy. +.005 seems to be pretty standard.
Interesting is that I couldn't find an Autolite BRF3 and the autolite is only listed as 10C.
 
Re: Spark Plugs and Gaps

Interesting points there Ricardo, and no offense taken. :cool: I ass-u-me'd :D that it was a stock setup as he didn't mention otherwise. The plug #s & gap I gave were straight out of my OMC owners manual which lists engine specs for 120-245hp motors.
 
Re: Spark Plugs and Gaps

Well, thanks to all of you for understanding how I meant that! :)

Glen, the .030" was borrowed from NW Redneck's post!
Whether .030", .032", .035", I still maintain that the higher output Ignition Systems can handle a greater gap than .030".
I only mentioned that in the event that the OP had installed a newer system.
But your point is well taken.
 
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