Engine Question

walkdawg · Jan 31, 2004

I just purchased a 89 ford bronco. I am doing a few things to it and when i went to change my spark plugs I found that the reccomended plug was to small. I was wondering if anyone could tell me how i could tell if someone changed the heads and what size the could be?

Sturgell · Feb 2, 2004

Look at the head in between the header/manifold and the valve cover. If your Bronco has the original heads the first letters in the casting number should read E9 Fords casting numbers as I understand it are C=6- D=7- E=8- then the number goes where the hyphen is. They might read E7 too look at the number and Take the number and say it is for an F-150 of that year with a 302.

azrockrat · Feb 3, 2004

there is a chance that some one put older heads on the bronco

walkdawg · Feb 3, 2004

Thanks Guys I will look into that.

walkdawg · Feb 15, 2004

Alrigtt guys I finally got a chance to look for numbers on the heads the only numbers i have came up with is 6h26. This number is under the valve cover. I was not able to find anyother numbers. I guess it is not really a big deal I just thought it would be good to know if there are different heads. Thanks for the help. :huh:

Txquadhunter · Feb 16, 2004

check to make sure the auto parts store gave you the right plugs. because the plugs in my 70 model 460 are the same as my 86 302. they're also the same plugs my 351m/400's use. even 76 351w i've got the plugs as the same part #'s as the others. haven't checked the 95 351w maf efi uses the same plugs. but i'll check the part #'s when i get the chance. go to like www.autozone.com and research the plug part numbers to see what all are the same as yours.

walkdawg · Feb 16, 2004

I looked all that up to see if autozone gave me the correct plugs. The part number the a stock 302 is motorcraft 450. I got those from autozone and they was too small. I pulled the old ones out and they were autolite 5144, which is a 444 motorcraft but I will do some more look alittle more.

fordman · Feb 17, 2004

The old heads had 18 mm. spark plug holes. I believe the 6h26 is the date code .The 6 being 1966 or 1976. H being august(8th letter of the alphabet) and 26 being the 26th of august.

walkdawg · Feb 18, 2004

I went to motorcraft web site and put the plug number the part number I bought to put in it. I put 444 motorcraft plugs in. They are the same size as the autolite 5144. Motorcraft says my plug goes in a escort. I know thats wrong. I was reall only worried that the gap might be wrong I used the stock gap of .44. It is running good right now. I really appreciate the help. Thanks allot. I plan put on some pics soon.