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darule336
06-09-2006, 07:03 PM
i have a 1982 mastercraft with a ford 351 and i need to get new plugs but i am unsure what plugs are the ones for my engine. I go throught books at the auto places and they don't include mastercraft. So then i Go and look at the other f351 engines then i get mixed types and gaps. help me out

Cloaked
06-09-2006, 08:15 PM
i have a 1982 mastercraft with a ford 351 and i need to get new plugs but i am unsure what plugs are the ones for my engine. I go throught books at the auto places and they don't include mastercraft. So then i Go and look at the other f351 engines then i get mixed types and gaps. help me out

http://www.skidim.com/products.asp?dept=1023


I use the NGK V-Power (85 MC - 351, 240HP), however this link will give you a selection and points of comparison.

Would luVs to see some pics of your 82. I like to look for unique color schemes.

TMCNo1
06-09-2006, 08:57 PM
For 17 years in our '89 351W/240hp, I have run Autolite #25 from Wal-Mart gapped at .035. I just spray a little silicone on the outside and some Lubrimatic Anti-Corrosion wheel bearing grease on the threads and change every other year.

darule336
06-11-2006, 04:22 PM
I am really concerned about the gap. Could anyone else verify a .035 gap. Not that i dont trust you i just want to see a few more people that use that or that can verify that is what to use.



Thanks for your Help!!!!!!!!!!! Much appreciated

TMCNo1
06-11-2006, 04:26 PM
Just using what my MasterCraft Power/Indmar owners manual calls for on the '89 model, shouldn't be much different if any.

H20skeefreek
06-11-2006, 05:02 PM
I don't remember what mine are set at off hand, I'll find out, but have you converted to Electronic ignition? to my understanding you change the gap when you do.

ski_king
06-11-2006, 05:25 PM
Here you go, out of the PCM manual I got with my 82.
Funny thing is it lists both 14 and 18 mm plugs, but 0.035 gap is correct.

I got my last set from skidim.com, they know what to sell you.

And yes, lets see some pictures of the boat!

darule336
06-11-2006, 06:42 PM
Is that correct to not use unleaded fuel. It is updated with the electronic ignition. IS it still a gap of .035 and the autolite 25's should work then.

ski_king
06-11-2006, 07:11 PM
Mine are gaped at 0.035 and I have ran unleaded for what seems like forever.

TMCNo1
06-11-2006, 08:36 PM
Is that correct to not use unleaded fuel. It is updated with the electronic ignition. IS it still a gap of .035 and the autolite 25's should work then.


I don't think that now you have a choice as to leaded or unleaded fuel, so unleaded is all you can run. I have an electronic ignition conversion kit in our '89 351W/240hp and nothing in the instructions tells you to change the gap of the plugs, as I just went and re-read them. I have been running mine set at .035 since the conversion for 3 years now, and I run 93 octane fuel.

east tx skier
06-11-2006, 08:45 PM
I've got the high output 351, so different plugs. But gap on mine is 0.035, too.

Hoff1
06-12-2006, 08:07 AM
I have a 1990 with the 351W 240hp engine. Use Autolite 24's and gap at 0.035. Tried to fit the 28's by accident, they won't fit because of the exhaust manifolds. Don't know if 25's are original equipment replacements, but I just replaced what was in there when I got it. Also just converted to electronic distributor this spring. Kept the gap at 0.035 and have yielded a couple hundred more rpm's over last year. Finally up to the max that the manual quotes.

pkskier
06-12-2006, 10:43 AM
Motorcraft ASF-32C, gap .035. Engine is a ford motorcraft is ford's parts division

Kevin 89MC
06-12-2006, 11:59 AM
FWIW, I run Autolite #24 in my boat. I did a bunch of research on plug gap when I changed them last spring. I had Motorcraft ASF-32C at 0.035. They were great plugs as well. There is much conflicting info out there: match gap to plug specs, match it to engine specs, do this, do that, etc. It came down to either 0.035 or 0.044. My feeling is that the engine will run at either gap, and a wider gap may produce slightly more power, if everything else is in good working order. A smaller gap tends to run cooler, and slightly less power. I ended up leaving them at 0.044, and have had no issues. I do have EI.
My :twocents:

darule336
06-13-2006, 06:31 PM
Well i talked to the vince at skidim and he said that the autolite 24's were the ones to use or the ones that pleasurecraft would send with it or would suggest or something like that. But the ones they sell on skidim are the 24's. gapped at .035 Thats what i am gonna go with thats for the help. ANd it appears that it doesn't really matter that much just as long as thier close. I wonder what the difference is between the 24 and the 25. they need to be close.

TMCNo1
06-13-2006, 07:17 PM
Well i talked to the vince at skidim and he said that the autolite 24's were the ones to use or the ones that pleasurecraft would send with it or would suggest or something like that. But the ones they sell on skidim are the 24's. gapped at .035 Thats what i am gonna go with thats for the help. ANd it appears that it doesn't really matter that much just as long as thier close. I wonder what the difference is between the 24 and the 25. they need to be close.


I was informed the 25's ran a little hotter, same price, so, I've just been running them for the giggles of it.