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AQUAHOLIC

  • Karma: +7/-0
spark plug question
« on: June 03, 2008, 08:20:53 PM »
i was looking thru the garage and i found a set of AUTOLITE 145 spark plugs. i checked with autozone and these will fit the 454 in my boat. my question to you guys is this a good choice for my boat or should i get a different set. also if these plugs are fine what should i gap them to.

thanks
tony
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When  you turn your boat on... does it return the favor?

crewchief22

  • Karma: +66/-0
Re: spark plug question
« Reply #1 on: June 03, 2008, 08:40:30 PM »
I put Autolite 26 in my 454 the last time.  I'm not sure where the 145 falls in on heat range.

Gap will depend on what ignition you are running.
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  • Boat #1: '77 Hondo Pantera GT Jet
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"Racing is life!  Anything that happens before or after, is just waiting"    Steve McQueen

The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

AQUAHOLIC

  • Karma: +7/-0
Re: spark plug question
« Reply #2 on: June 03, 2008, 09:37:53 PM »
i got a malory ignition
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crewchief22

  • Karma: +66/-0
Re: spark plug question
« Reply #3 on: June 03, 2008, 09:39:29 PM »
I would probably set the gap at .035 to start if you don't have a reference (previous setting).
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  • Boat #1: '77 Hondo Pantera GT Jet
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"Racing is life!  Anything that happens before or after, is just waiting"    Steve McQueen

The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

AQUAHOLIC

  • Karma: +7/-0
Re: spark plug question
« Reply #4 on: June 03, 2008, 09:58:41 PM »
so i can throw these 145s in my motor. i am not sure on the heat range either. when i looke up the part number at autozone it said it was a heavy duty plug for a chevy truck with a 454
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When  you turn your boat on... does it return the favor?

crewchief22

  • Karma: +66/-0
Re: spark plug question
« Reply #5 on: June 03, 2008, 11:36:34 PM »
Probably not far off.  You might make a run and pull 1 or 2 out to look.
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  • Boat #1: '77 Hondo Pantera GT Jet
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"Racing is life!  Anything that happens before or after, is just waiting"    Steve McQueen

The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

GT Jets

  • Karma: +192/-0
Re: spark plug question
« Reply #6 on: June 03, 2008, 11:52:00 PM »
This is dumb but does your motor use peanut plugs or gasket plugs, older heads used the gasketed plug, it just didn't come up.

And with your ignition system .035" should do

The 145 autolite is for mid '70's to Early '80's GM V8 (very common plug) with HEI (among others I'm sure)
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  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Moneypit

  • Karma: +1/-0
Re: spark plug question
« Reply #7 on: June 04, 2008, 12:00:59 AM »
WHOA trigger........Are these deep reach plugs? Early MKIV motors used 3/4 reach plugs...Put those in a 1/2 or 3/8ths reach head and you'll break pistons until it quits running......Get a little more info on number cross over..........MP
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LOUD BOATS SAVE LIVES

GT Jets

  • Karma: +192/-0
Re: spark plug question
« Reply #8 on: June 04, 2008, 12:05:41 AM »
Thats what I'm saying, what heads?;) I just didn't like the words "throw these plugs in" and party!

Never have too much info.
Thanks MP


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  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

AQUAHOLIC

  • Karma: +7/-0
Re: spark plug question
« Reply #9 on: June 04, 2008, 11:23:35 AM »
wow. i am glad i asked. so i should check the number on my heads before putting in spark plugs. that is good to know. were are the id numbers on the chevy heads?

thanks again guys. i am determined to have a good boat summer this year. last year i had to pull the motor almost everyweekend.. :banghead:
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crewchief22

  • Karma: +66/-0
Re: spark plug question
« Reply #10 on: June 04, 2008, 12:36:18 PM »
Casting #s will be under the valve covers. 

Are there any plugs in the engine now?
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  • Boat #1: '77 Hondo Pantera GT Jet
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"Racing is life!  Anything that happens before or after, is just waiting"    Steve McQueen

The problem with America is stupidity. I'm not saying there should be a capital punishment for stupidity, but why don't we just take the safety labels off of everything and let the problem solve itself?

thecraz

  • Karma: +2/-0
Re: spark plug question
« Reply #11 on: June 04, 2008, 12:45:35 PM »
pull out one of the plugs thats in there now and compare it to the new ones if there the same length put them in. thecraz
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If You Can't fuk It Or Eat It Piss On It

AQUAHOLIC

  • Karma: +7/-0
Re: spark plug question
« Reply #12 on: June 04, 2008, 03:25:06 PM »
no plugs in the motor now. and taking my valve covers off means i have to take my headers off. so that kind of sucks. i might just swing by the engine builders and see what he says.
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When  you turn your boat on... does it return the favor?

speedymopars

  • Karma: +6/-0
Re: spark plug question
« Reply #13 on: June 06, 2008, 03:06:46 PM »
Makes me happy I have a mopar. Autolite 75's for all the big blocks with factory iron heads, and Autolite 65's for everything else (including 4's, 6's, etc) including most aftermarket BB heads. 
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21' 74 cheyenne 543 Mopar Berkeley Jet Place diverter
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