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Author Topic:   Spark Plug heat range?

Posts: 761
Registered: Jul 2001

posted 05-23-2002 06:19 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
What heat range should a 302 roller block with 9:1 comp and X303 heads run? I currently have Autolite 104's, and the salesman mention they might be too cold. What do you think?

[edit] The engine came from the factory with 104's, so that's why I was running them.

1965 Coupe, Tremec 3550, Steeda Tri-Ax, Cable Clutch conversion, 9" N case, 4.11's, Detroit Soft Locker, 31 spline Moser axles, Daytona pinion support,, Biondo Line Lock, Ford XB3 longblock, x303 heads, B-Cam, 9:1 comp., Tri-y headers, cut-outs, Ford Racing high-torque mini-starter, Pertronix Ignitor & Flamethrower coil, 650 double pumper, Edelbrock RPM intake, K&N air, Holley electric fuel pump & AFPR, dual 2-chamber Flowmasters, Summit 3-way fronts, Rancho 5-way rears, 5-leaf springs, Chrome Export Brace, Griffen Radiator, Comp. Eng. subs.

[email protected] w/ a 1.837 60'

[This message has been edited by 65_289 (edited 05-23-2002).]

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Posts: 1635
From: Hurricane alley
Registered: May 2002

posted 05-23-2002 06:55 PM     Click Here to See the Profile for Buster   Click Here to Email Buster     Edit/Delete Message   Reply w/Quote
I don't know Autolite part numbers or what year your heads are...
But, the 5.0's use AWSF44C, ASF52C and I think AWSF42's MotorCraft.... going by memory here.

I think the lowest heat range is an AWSF24C and the hottest is the AWSF54C.

The ASF22C are the lowest and the ASF52C the hottest. I don't think they make an ASF62C or a ASF12, not for sure. The AWSF44C��s have a �� shoulder at the bottom of the plug. The AWSF22C colder then the AWSF54C's being the hottest.

If they are the ASF style plugs, I have use in a setup like yours the ASF22C and 32��s without any problems. If they are the AWSF44C style use the AWSF24C or 34. Same with the ASWF52��s.

[This message has been edited by Buster (edited 05-23-2002).]

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