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C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Dart Pro 1 users or spark plug experts inside please

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Old Oct 31, 2006 | 03:23 PM
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Default Dart Pro 1 users or spark plug experts inside please
Which spark plugs are you guys using with your Dart Pro 1 alum heads? The plugs Dart recommends are the Autolite AR3933 but these are not resistor plugs. I know I need a resistor type plug w/ .750 reach, 5/8 hex head, 14mm threads but I don't know the heat range I should use. Oh yeah and I'm looking for a Champion plug because of header clearance. So far I came up with Champion # RC12YC. Am I on the right track?
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Old Oct 31, 2006 | 04:17 PM
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Was using champion 12yc---switched to nkg r5671a. engine builder recomended this change. The nkg are one range colder.: Ran strong with both sets.
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Old Oct 31, 2006 | 05:00 PM
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Originally Posted by BTTB
Was using champion 12yc---switched to nkg r5671a. engine builder recomended this change. The nkg are one range colder.: Ran strong with both sets.
Thanks. I may go w/ the RC9YC just to be on the safe side.
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Old Oct 31, 2006 | 05:08 PM
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Also will I have clearance issues w/ a projected tip plug on a ZZ4 shortblock w/ flat top pistons?
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Old Oct 31, 2006 | 05:14 PM
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ngk fr5
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Old Oct 31, 2006 | 05:18 PM
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acc-0416s
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Old Nov 1, 2006 | 12:14 PM
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autolite 3926 is stock heat range, 3924 is one step colder, there are also 3923 and 3922, but not quite sure if they are 2 steps colder or not.
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Old Nov 1, 2006 | 12:53 PM
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Gone through Acd rapid fire it good but i think way too hot for summer time, NGK 5151 again too hot, finally went with NGK 7373 (FR5) this i found the best plugs so far on mine.
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Old Nov 1, 2006 | 02:52 PM
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Originally Posted by USAsOnlyWay
acc-0416s
Accell shorty plug

Product Description
Spark Plug, Shorty, U-Groove, Flat Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each --- ** Shorty Spark Plug: Yes ** Resistor: Yes ** Manufacturer Heat Range: S ** Electrode Core Material: Copper ** Electrode Tip Material: Copper ** Insulator Type: Projected ** Spark Plug Thread Size: 14mm ** Spark Plug Reach: 0.750 in. ** Spark Plug Seat Style: Gasket ** Wrench Diameter: 5/8 in. ** Ground Strap Quantity: One ** Quantity: Sold individually.

http://store.summitracing.com/partde...5&autoview=sku
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Old Nov 1, 2006 | 06:37 PM
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I hate accel plugs with their screw-on terminals. I just don't trust that concept. Last set I pulled, the terminals were so loose they nearly fell off
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Old Nov 2, 2006 | 07:16 AM
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Originally Posted by NUckINg FuTS
I hate accel plugs with their screw-on terminals. I just don't trust that concept. Last set I pulled, the terminals were so loose they nearly fell off
I put the terminal end in my vice, then put a wrench on the hex, and snugged them tight, no issues.
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