smdh...Calling all the (small block) engine gurus
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Senior User
Joined: Jun 2014
Posts: 162
Likes: 1
From: Elizabeth City, NC
smdh...Calling all the (small block) engine gurus
I've got an '85 F-150. It originally came with a H.O. 5.8L (H code). BUT, after purchasing it I found that it appears to have a 302...not that I REALLY care. Anyhow, I ordered a bunch of parts from RockAuto for it. I looked up an '85 with a 302, and I chose Motorcraft SP450s.
WRONG PLUGS.
This engine has Autolite 45s in it (larger 13/16 hex). Best I can tell, I've either got vintage heads or just an old engine all together, The valve covers APPEAR to be original tol the '85, and the passenger side exhaust manifold HAS a provision for an O2 sensor. Any ideas or recommendations on which spark plug to run? Sure I could go back with the Autolite 45s, but is it the RIGHT plug to run?
I found this...
http://www.napaonline.com/Catalog/Bu...&PartNumber=45
WRONG PLUGS.
This engine has Autolite 45s in it (larger 13/16 hex). Best I can tell, I've either got vintage heads or just an old engine all together, The valve covers APPEAR to be original tol the '85, and the passenger side exhaust manifold HAS a provision for an O2 sensor. Any ideas or recommendations on which spark plug to run? Sure I could go back with the Autolite 45s, but is it the RIGHT plug to run?
I found this...
http://www.napaonline.com/Catalog/Bu...&PartNumber=45
Senior User
Joined: Nov 2011
Posts: 456
Likes: 1
From: Owensboro, KY
As far as I know, no smallblock heads ever used 13/16 plugs, and they also never installed the o2 in the manifold, it was in the y-pipe. Can you post pics to give us a better idea what you're working with?
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
Passenger side manifold probably has provision for EGR or A.I.R. injection.
Who knows what kind of swap was perpetrated on this poor truck.
The plugs are likely whatever the PO had available.
Who knows what kind of swap was perpetrated on this poor truck.
The plugs are likely whatever the PO had available.
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