snomobeelr Posted August 1, 2018 Share Posted August 1, 2018 So I am running rich and looking to run a hotter spark plug . I currently run the NGK - R5671A-7 (Non-projected) . That plug is the hottest for that model of plug. NGK does make other plugs that are hotter but are as they say are "Projected ". And a little longer in the cylinder. I am told the lower the number on the NGK the hotter the plug is. I am going to just go 1 number down so was going to go to a 6. Anyone use something else or have any advise? R5671A-7 : Non-projected : Manufacturer Heat Range: 7 : NGK Racing Spark R5671A-7/4091 ................................................................................................................................................................................................... BKR-6-E : Projected : Manufacturer Heat Range: 6 : NGK V-Power Spark BKR6E/6962 bcpr6eg9 : Projected : Manufacturer Heat Range: 6 : NGK G-Power Platinum Spark Plugs BCPR6EGP/7088 NGK FR5 : Projected : Manufacturer Heat Range: 5 : NGK V-Power Spark FR5/7373 Engine Cubic Inches: 468 Compression Ratio: 10.1 Intake Manifold Brand: Edlbrock AIR GAP RPM Header full Patriot 1 7/8" 3 inch Exhaust .................................................................... Cylinder Head Type: Brodix race rite oval port Intake Valve Diameter: 2.250 in. Exhaust Valve Diameter: 1.880 in ................................................................... Type of Camshaft: Hyrdaulic Roller Lifters Camshaft - Intake Duration @.050: 232 Camshaft - Exhaust Duration @.050: 244 Camshaft - Intake Lift at Valve: 595 Camshaft - Exhaust Lift at Valve: 581 Lobe Separation: 107 ..................................................................... The Spark Plugs are NGK V-Power R5671A-7 Gap is .35 ................................................................................................................ Federal Mogual Forged : .095 Dome Pistons Felpro 1027 Head gasket : .039 thickness Broddix Race Rite : 119cc Chamber, 270cc Intake Runner Quote Link to comment Share on other sites More sharing options...
MC1of80 Posted August 1, 2018 Share Posted August 1, 2018 If it's running rich, I hope you are starting with the carb and timing. Fouled plugs are a byproduct. What size and type of carb? Jet sizes? Power valve? What is your timing at? Quote Link to comment Share on other sites More sharing options...
snomobeelr Posted August 1, 2018 Author Share Posted August 1, 2018 Hello , Yes started with that. I can idle fine and driving around is ok she is just running rich. The 4 corner Mixture screws are out @2.5 turns and any further in and she drops alot of RPM when going into gear.Timing I've tried initial @18 and @20 , Total ends up between 36 -38 both the same u. Its a Pro-System 950 Jets I changed from 76 to 74 and PV-6.5. Specs for carb attached. Hotter Plugs were one of the suggestions from Pro Systems. Thank You Quote Link to comment Share on other sites More sharing options...
MC1of80 Posted August 1, 2018 Share Posted August 1, 2018 I have a 950 hp on my 496. More cubes, bigger solid cam, hooker super comp 2" headers and I have smaller jets than you. I honestly would down jet and of course change the plugs. Quote Link to comment Share on other sites More sharing options...
snomobeelr Posted August 7, 2018 Author Share Posted August 7, 2018 So the plugs that I am looking at that are 1 range hotter are still NGK but the "Model" so to say is different. Everything else matches the only difference is they protrude into the chamber 2 mm farther than the ones I currently run. I am a bit paranoid about putting longer plugs and hitting the piston. Or am I just being paranoid ? R5671A-7 / 4091 = 1. MM BKR6E / 6962 = 3 MM ( New ones) Quote Link to comment Share on other sites More sharing options...
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