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#1
06-02-2023, 06:35 PM
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KRE heads and spark plugs
I changed the plugs on my car today, had these heads since 2010, the plugs are auto lite 3924 with the crush washers,.
I always start them with a rubber hose over the plug to get them started, then i put my socket on them to turn till snug against the head. This is where i seem to get confused, says hand tight till snug, then another 1/4 to 1/2 turn..................ok got that. But as soon as i put the wrench on, and only using one hand to not overtighten the plug, they seem to spin quite a few more turns with really no effort, then they will get someone tight, then i go maybe a 1/8 to 1/4 turn..........im assuming the crush washer is crushed. My question is when the plug is tight with the socket by hand, why does it seems to turn quite a bit more before becoming a little more than snug....... I see no damage in any of the threads inside the motor...........the motor is on a stand now so easy to see . Rich |
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#2
06-02-2023, 07:47 PM
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That’s perfectly normal. No worries.
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#3
06-02-2023, 07:57 PM
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Also according to Murphy’s law if you put a plug back in a aluminum head that is hot, then chances are that when the head cools the plug will be loose.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
06-02-2023, 09:48 PM
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Hey, thanks guys................just wondering would it pay to run a spark plug chaser thru the heads.............never done that before.................Hey Gach, first the oil pump shaft issues, now spark plug issues.................im hoping to get this car running soon before i get a foot in the grave.........
Rich |
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#5
06-03-2023, 12:45 AM
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I wouldn’t Rich.
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#6
06-03-2023, 05:55 AM
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Wait a minute now!
Do the KRE heads use a 13/16” plug with a flat washer? Are they machined for that type or only a 5/8” type with a taper seat?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#7
06-03-2023, 07:05 AM
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When installing these plugs into the heads I coat mine with a bit of cooper coat to prevent galling. Like mentioned the crush washer has to crush which will seat the plug. Tighten then up a bit. I use to run the Auto lite in my KRE heads, but I like the NGK plugs. R5671A-7
https://www.ngk.com/ngk-4091-r5671a-7-racing-plug
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick. Best so far 9.95@135 mph. 1.39 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exhaust 950 Quickfuel. |
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#8
06-03-2023, 07:51 AM
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Quote:
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#9
06-03-2023, 07:57 AM
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Then how the heck are some folks trying to get washer / gasket type plug to work?
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#10
06-03-2023, 08:01 AM
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Gach.............i wasnt talking about a tap................i thought you could run a chaser/cleaner in the threads............thought they were supposed to just clean the threads, not damage them.................think i"ll just leave them alone.
Rich |
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#11
06-03-2023, 08:10 AM
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Quote:
It's my understanding that KRE recommends gasket /washer plugs.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick. Best so far 9.95@135 mph. 1.39 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exhaust 950 Quickfuel. |
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#12
06-03-2023, 10:22 AM
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Autolite 3924 plugs are 5/8 with gasket.
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... 
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#13
06-03-2023, 11:04 AM
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Quote:
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#14
06-03-2023, 01:07 PM
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I just looked at my set of KRE heads and there is no taper on the spark plug holes.
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick. Best so far 9.95@135 mph. 1.39 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exhaust 950 Quickfuel. |
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