Confused...
07-24-2005, 06:02 PM
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Confused...
So when I first got the car the kid said "The previous owner told me he swapped in a 350, but I think he was just saying that so I would buy it." So I kinda doubted to and bought it anyway, thinking its just a regular 305. Friday I picked up some AC Delco R43TS plugs to put in today. I pulled the first one and realized something wasn't right. It had an Autolite 3924 which has about twice the threads the Delco does. My Haynes manual recommends a FR3LS for aluminum heads of the same year, which cross references to match up with the autolites. I didn't think third gens came with aluminum heads? I guess the guy telling the truth and swaped in something else.
07-24-2005, 09:18 PM
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Casting number 627 on the block so its a 305. But these spark plugs still make me wonder... The heads look more like iron than aluminum and a magnet sticks to them. But if you had a plug with longer threads wouldn't it run weird?
Last edited by Kurt04; 07-24-2005 at 09:39 PM.
07-24-2005, 09:39 PM
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Put a magnet to the head, if it sticks, it's castiron, if not, Al.
Try www.mortec.com or www.chevymania.com (probably a zillion others) for casting numbers.
Try www.mortec.com or www.chevymania.com (probably a zillion others) for casting numbers.
07-25-2005, 12:34 AM
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Car: Tree Huggers
Engine: Do Not
Transmission: Appreciate Me.
Re: Confused...
Originally posted by Kurt04
...AC Delco R43TS
... Autolite 3924
...FR3LS
...AC Delco R43TS
... Autolite 3924
...FR3LS
AC R43TS:
14mm... .460" reach... 5/8" Hex... Tapered... Non-Resistor
Autolite 3924:
14mm... 3/4" reach... 5/8" Hex... Gasket... Non-Resistor
AC FR3LS:
14mm... 3/4" reach... 5/8" Hex... Gasket... Non-Resistor
Best to pull a v/c and see what you got.
07-28-2005, 10:07 PM
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Car: Tree Huggers
Engine: Do Not
Transmission: Appreciate Me.
What do those gaskets (on the plugs) look like?
-Steve (Black Bomber)
-Steve (Black Bomber)
Last edited by Red Devil; 07-28-2005 at 10:16 PM.
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