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Thread: Spark Plug Heat Range

  1. #1

    Default 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.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
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    22,740

    Default

    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" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 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 tires.

  3. #3

    Default

    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.

  4. #4

    Default

    What's the commanded AFR at idle?

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