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#1
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1955 spark plug question
I have a 1955 GMC with the 287 V8 that I am getting ready to fire for the first time after a rebuild and I am trying to decide which spark plugs to put in it.(Or at least to start with) It has the stock cam, stock heads, is bored .060 over and has flat top pistons. I think it should be 8:1 compression. Bendix-stromberg 2 barrel carb. I am only looking at ACDelco part numbers to keep it simple.
The plugs I already have on hand are: 43,44,44s,45,45s |
#2
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The "s" plugs designate a longer electrode for better electrode cooling during heavy acceleration while still offering the same heat range (ie. 45 vs. 45s) for normal driving. I used the 45S (actually R45S) with an HEI in my '57 GMC with 347 V8.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
#3
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i Have 1 box NOS of each 45LS & 45NSX if in need.
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#4
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I think I will start with the R45S and see how they look after I break it in and run awhile. I was just concerned about them being a little too hot.
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#5
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One thing. The S series plugs are a little longer. Install one, then manually turn over the engine a few revs. Remove the plug and make sure it has not contacted the piston.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
#6
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45S is definitely not too hot for your engine.
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons? ... or has built a record breaking DOHC hemi four cylinder Pontiac? ... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967) |
#7
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I run the 45's that are avalible today in my 57 Pontiac, no problems
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#8
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Just in case anyone here cares, I believe the last time I looked the R43S & R45S was a readily available plug.
I collect 44/44S/R44S plugs, and if the price is right I will also buy 43 and 45 heat range plugs in the same configurations - it's the "44" plugs that have been discontinued for a while...
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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