Spark plugs for high CR

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03-15-2010, 11:41 AM

WASyL

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Car: 1988 Pontiac Firebird

Engine: 305 LT1 intake&heads

Transmission: TH700r4

Axle/Gears: 3.73 10bolt GM

Spark plugs for high CR

my setup is 383 with 165cc heads (combusion chamber 64cc) and flat top pistons with valve reliefs so that sends me to high CR. intake is HSR, cam CS XR276HR-12. as i,m not able to change these cylinder heads now i need to get proper plugs, which spark plugs should i choose ?? any part numbers whould be very helpful.

best regards

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03-15-2010, 04:32 PM

88IROC350TPI

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Car: '89 IROC-Z

Engine: Canfield 195 headed 358ci

Transmission: TH350, Art Carr 9.5"

Axle/Gears: 3.92 Dana 44

Re: Spark plugs for high CR

Without knowing the exact heads it's impossible to give you a specific part number but I imagine a plug like Autolite 24's would be a good starting point.

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03-15-2010, 06:23 PM

WASyL

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Join Date: Jan 2008

Location: Europe->Poland->Warsaw

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Car: 1988 Pontiac Firebird

Engine: 305 LT1 intake&heads

Transmission: TH700r4

Axle/Gears: 3.73 10bolt GM

Re: Spark plugs for high CR

heads are Edelbrock 60859 http://www.summitracing.com/parts/EDL-60859/
Autolite is hard to get in Europe, can i use NGK BPR6FS (2623) or Champion RV12YC instead of AR24?

best regards

Last edited by WASyL; 03-15-2010 at 06:42 PM.

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