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09-18-2007, 03:45 PM
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#1 |
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Registered User
Join Date: Jan 2006
Location: mn
Posts: 92
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big block sparks plugs
I have a 68 gmc with a 396 (which i think is original motor) it had r44xls plugs, i put a hei in it was going to change to the r45ts but they dont have a long enough throat or enough threads, should i stay with the 44xls and regap to 45 or is there another plug i should be using thanks Ron
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09-18-2007, 03:51 PM
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#2 |
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Registered User
Join Date: Jan 2007
Location: Topeka,KS
Posts: 778
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Re: big block sparks plugs
Could you use, say a later model 454 plug? I'm not sure but don't HEI's gap to .060" ?
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09-18-2007, 03:59 PM
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#3 |
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Senior Member
 Join Date: Mar 2003
Location: Colfax-California
Posts: 8,499
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Re: big block sparks plugs
you can use the same plugs
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09-18-2007, 04:03 PM
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#4 |
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Registered User
Join Date: Jan 2006
Location: mn
Posts: 92
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Re: big block sparks plugs
the later model plugs have shorter threads and dont even thread in the holes, why is this
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09-18-2007, 04:06 PM
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#5 |
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Account Suspended
Join Date: Aug 2007
Location: Austin, Tx
Posts: 81
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Re: big block sparks plugs
use the stock pn plugs and regap to at least .045
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09-18-2007, 04:49 PM
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#6 |
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Active Member
Join Date: Oct 2006
Location: Ohio
Posts: 1,643
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Re: big block sparks plugs
I understand the GM dealers and some after market are now selling a simple part nnumber for the AC delco plugs 1-6 changes the heat range.
I understand the #4 plug is an ideal street plug for the big block. All that being said I just bought the R44XLS plugs for mine and gapped them at 45
__________________
1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles  18.5" x 31" Hoosier Pro Street Radials  ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree 
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09-18-2007, 07:39 PM
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#7 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: big block sparks plugs
I've been told to go with a R45TS plug, it's a little longer and helps resist fouling on older engines.
This was for a 72 402, iupdated with HEI |
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09-18-2007, 11:09 PM
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#8 |
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Registered User
Join Date: Jan 2006
Location: mn
Posts: 92
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Re: big block sparks plugs
longhorn man, i tried the R45TS they dont have enough threads to even screw in, but it sounds like i can go with the R44XLS, are the older big block heads casted different than the newer big block heads? Thanks for all the input Ron
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09-18-2007, 11:29 PM
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#9 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: big block sparks plugs
I have no idea. Thiw will be my first big block chevy
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09-19-2007, 07:20 AM
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#10 |
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Weekend Warrior
Join Date: Oct 2004
Location: CT
Posts: 1,787
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Re: big block sparks plugs
I ran into the same problem recently.
Had to go with the R43XLS's which is 1 step colder than the R44XLS's (I did this because my motor is pretty built) If you have a stock motor the R44XLS will work. Just gap to .045 - that's what I did, and I have an HEI
__________________
-'07 GMC Sierra K2500HD -'66 C10 Suburban -'68/'71 K20 Service Bed Project -'69 Chevy C30 Mason Dump -'33Ford P/U 396ChevyPowered  
Last edited by arkracing; 09-19-2007 at 07:28 AM. |
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