Spark Plug Heat Range

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  • John
    Member
    • Jun 2016
    • 47
    #1

    Spark Plug Heat Range

    Hello. 383" SBC, Terminator TBI EFI 10:1 compression. Roller cam.
    .528" Intake, .536" Exhaust lift.
    221° Intake, 226° Exhaust duration.
    @ .050 - 110° Lobe Separation Angle.
    What would be a good spark plug heat range to start with? Thanks.
    '69 Camaro Convertible. SBC 383 stroker by Blueprint Engines. Roller cam, 443 HP/463 TQ. Edelbrock RPM Air-Gap intake, Holley Terminator EFI, Holley Digital Dash, Hooker headers, Pypes Race-Pro mufflers, Tremec TKO-600 5 speed, 3.55:1 posi rear.
    Tags: None
  • Danny Cabral
    Administrator
    • Dec 2009
    • 35963
    #2
    Try the stock heat range if they're firing clean (no carbon deposits), or one step colder.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, Eagle 3.470" forged steel crankshaft & H-beam rods, Wiseco 4.200" forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/.623" lift/114° LSA H/R camshaft, Trick Flow R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes SS dual 2.5" exhaust, SS off-road X-pipe, SS shorty headers, OEM smog pump converted vacuum pump, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, highly modified Ford 4R70W transmission, FTI 9.5"/3000 stall/triple disc TCC, B&M Hammer shifter, Stifflers trans crossmember & driveshaft safety loop, FPP aluminum driveshaft, FPP 3.73 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

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    • John
      Member
      • Jun 2016
      • 47
      #3
      Does a primary header tube temp average of 625° sound high? There's a little carbon, but I thinks it’s old. I’m using a heat range 6.
      '69 Camaro Convertible. SBC 383 stroker by Blueprint Engines. Roller cam, 443 HP/463 TQ. Edelbrock RPM Air-Gap intake, Holley Terminator EFI, Holley Digital Dash, Hooker headers, Pypes Race-Pro mufflers, Tremec TKO-600 5 speed, 3.55:1 posi rear.

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      • Jay@HAP
        Senior Member
        • Apr 2016
        • 137
        #4
        What's the commanded AFR at idle?

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