Spark Plugs

[drem312]

any suggestions and what size ,,,I just got the engine back last week rebuilt ,,He used a different block its a chevy 1995 5.7 350 bored 30 over says it 305 hp all rebuilt to marine engine specs etc,,, but need plugs this morning ,,, seems to be a ton out there but want to make sure I get the right one, I used to run champions in my old 454 merc ,,, I know there are Delco or Ngk,,, for this type of fishing/cruiser motor in a 1990 25ft CristCrart any ideas....

 

[series60]

Re: Spark Plugs

any suggestions and what size ,,,I just got the engine back last week rebuilt ,,He used a different block its a chevy 1995 5.7 350 bored 30 over says it 305 hp all rebuilt to marine engine specs etc,,, but need plugs this morning ,,, seems to be a ton out there but want to make sure I get the right one, I used to run champions in my old 454 merc ,,, I know there are Delco or Ngk,,, for this type of fishing/cruiser motor in a 1990 25ft CristCrart any ideas....

Here is what I run in mine: AC MR43T

 

[Bondo]

Re: Spark Plugs

AC MR43T

Ayuh,... Agreed....

 

[ButchC]

Re: Spark Plugs

I've been very happy with NGK BR6FS plugs in my 5.7

Plug brand will raise as many responses as an oil brand

Butch

 

[FreeBeeTony]

Re: Spark Plugs

Just make sure you don't have Vortec heads!!

 

[drem312]

Re: Spark Plugs

Just bought the AC plugs the engine builder suggested the champions for it but I went with the others

 

[drem312]

Re: Spark Plugs

now I need a good coil

 

[Fishermark]

Re: Spark Plugs

now I need a good coil

What ignition system are you running?

By the way - I agree with the others on the Ac plugs... but the NGK are good as well. I personally would suggest staying away from the Champions. So you did good buying the AC's!

 

[drem312]

Re: Spark Plugs

Im running the petronix system.

 

[Fishermark]

Re: Spark Plugs

In other words you had points at one time and have changed out to the Pertronix system? Do you have the Ignitor II? You want a coil that is internally resisted, not external, as the Pertronix wants a full 12 volts. To make it simple you can buy the Pertronix Flamethrower coil.

 

[drem312]

Re: Spark Plugs

yes the petronix had already been switched out I did see there site seemed to have a lot of options guess i will call them thanks for all the help....

 

[Fishermark]

Re: Spark Plugs

A quick and easy (and cheap!) solution is to go down to your local auto parts store and get a universal 12v internally resisted coil. If they need a part number, you can use Standard Ignition part # UC-15. As an example, you can buy that coil at Summitracing for $22.

(In this case, there is no need to be worried about the automotive / boat safety issue. A coil is a coil).