OchoCinco
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Looking to get new plugs, what do you guys use/recommend? What gap are you running?
What spark plugs for 350 5.7?
- Thread starter OchoCinco
- Start date
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SquareRoot
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That's like asking what oil one prefers. If its a stock engine, use what the book says.
ali_c20
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I buy the standard ACDelco plugs with the specs for my engine. Works for me, I'm mostly cruising and they are cheap.
I tried fancy iridium once but I couldn't tell any difference. Maybe there is one if you have a performance setup.
I tried fancy iridium once but I couldn't tell any difference. Maybe there is one if you have a performance setup.
75gmck25
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I used Delco R45TS with stock heads, but noticed that rockauto now shows the R44 as stock.
Ignore the .060 HEI gap recommendations you see in some references, since GM later realized that was too wide. Most folks now use about .040-.045 with stock HEI.
R - resistor
4 - 14mm
5 - heat range ( 5 is the hottest)
T - tapered seat
S - extended tip
Ignore the .060 HEI gap recommendations you see in some references, since GM later realized that was too wide. Most folks now use about .040-.045 with stock HEI.
R - resistor
4 - 14mm
5 - heat range ( 5 is the hottest)
T - tapered seat
S - extended tip
BillK
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I have always used what the owners manual calls for unless it is a modified engine. AC Delco for me.
82sbshortbed
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X2
Raider L
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I've got 1970 Z28 300 HP heads on my 350 so it's always interesting going to the parts store to get plugs. I think, I'd have to go look, they're R45TS or something like that, maybe. Now, if I still had the old 882 2 bbl. heads on it I think they were R44T big plugs, 13/16" size, gapped at .035" That's by the book.
