I wasn't sure what to gap my spark plugs when I put them in. Right now I'm running number 2 heat range AC rapid fire plugs. I just installed a new msd 6A MSD kit in my 1968 el camino. Typically, plug gaps are dependant on ignition. The silicone jackets of the spark plugs provide extreme resistance against heat and the so does the straight boots of the unit. A high-performance engine responds to an increase in plug gap because the wider gap produces a more energetic and powerful spark. While spark plug gap does not have a direct effect on timing, excessive gap in a power adder application can easily cause engine misfire. The following test will determine if your MSD is producing a spark. The reason is the bigger the gap, the larger the spark and the better chance of igniting all of the air/fuel mixture. This is why we recommend you stay away from the so-called âhype plugsâ. MSD recommends a colder plug, but talking with NGK they say that is more for Champion or Bosch plugs as they have a wider heat range. Find MSD Street Fire Spark Plug Wire Sets and get Free Shipping on Orders Over $99 at Summit Racing! The NGK 6619 Iridium IX Spark Plugs snags the top pick in our spark plug comparison because they offer the best mix of high-performance, fuel efficiency, durability, and dependability. I was running NGK Iridium plugs (Part # WR5IX) before. The gap of the plugs can be opened in 0.005" increments, then tested until the best performance is obtained. Spark plug gap for Points is .035 and any electronic or MSD is .040-.045 General Guideline- Pump gas street engines would use a -5 to -7 heat range, high compression race engines may use a -8 or -9 heat range, and boosted/nitrous engines may use a -9 or -10 heat range depending on levels of boost/nitrous. Magnum plugs use a gap of .040 inch. we suggest the use of the MSD spark plug wires PN# 31199. With that, you can then experiment with the plug gap to obtain the best performance. Personally, on gas I run an NGK cold v-type plug at 0.9 with MSD and a bosch coil (the little black transformer type). White Wire Trigger: If you are using the White wire (points or electronic amplifier) of the MSD to trigger the ignition, follow these steps. Rufas just to know that most of what you and Dave are discussing is over my understanding. A proprietary ceramic material enhances the dielectric strength of the plug housing forcing the spark, even under extreme cylinder pressures, to jump across the plug gap to the ground electrode,â MSD â¦ MSD's spark plugs are engineered to improve the efficiency of the combustion process to create the most power possible combined with increased durability. I just want to get some feedback on what everyone thinks the best spark plug is? As mentioned a spark plug operates in the range temperature 450 â 870°C, at 450°C carbon deposits being to burn off and if a plug may have a very black insulator nose at a lower temperature. The wires feature 500 ohms per foot of resistance for improved spark delivery and power, with a helically wound conductor that suppresses EMI. I have a 540 with Comp cam, MSD 6-AL box and MSD 8207 coil. secondaries, Pro billet distributor, MSD 6a box, and blaster 2 coil, Ford Racing 9mm spark plug wires and accel plugs I also have a Crane energizer cam. plug gap 555, I'm not an MSD fan anymore, what with their pieces being made in China now, and I run a 25+ yr old setup with a Ford Duraspark dizzy, Taylor wires, Jacobs #8 computer and 380672 coil, and run the gap at .080. Every Ignition Has Two Sides. So I when with what was on the MSD box for the compression. For example, with an HEI system, you must have a coil and module that is strong enough to jump a wider gap. We are also aware that using the MSD with platinum plugs may increase the chances of pinging and detonating. Probably 0.35â³ for a carbureted engine. Checking The MSD Ignition For Spark. Stock gap on the 87-93's is 0.052-0.056" SO the gap the shop gave you sounds right for an N/A car. The bigger the gap, the more power required to jump the gap, hence the spark ends up 'hotter' but shorter. I have a lot of experience with the MSD on street trucks and cars. Discussion Starter â¢ #1 â¢ Apr 29, 2006. However, we do recommend following the engine builder or manufacturerâs specification for spark plugs. Common sense tells me that the greater the plug gap, the greater exposure the mixture gets to the heat of the spark, the heat in the spark being what ignites the mixture. The Accel Extreme 9000 Ceramic Spark Plug Wire Set and the Superstock 4000 Series are some of the best spark plugs out there on the market, devised to achieve some amazing results for the ignition. I read one Chevrolet mechanic that gaps his plugs at 0.42â³ in small block 350 engines. Itâs important to have a quality spark plug for the best performance, since there are so many combinations and manufacturers, MSD does not recommend any specific gap. The gap makes a difference (in theory.....). Its a stock 302 with e7 heads, carburated, e-cam, long tube headers, x-pipe, holley 650 d.p., MSD 6-AL box, 16* timing, and the cam gear is advanced. Spark plugs seem like a simple component and it can be believed that a hotter plug is always the best choice when in reality too hot of a plug can be very harmful to the engine. The Bosch [ Australia ] HEI system specified 0.065" plug gaps on engines with well over 9:1 CR. MSD summed up for us on their educational site what is exactly happening within the ignition process: A typical (meaning stock) 12-volt automotive ignition system operates by taking in a low voltage with high current from the carâs battery and changing it into a higher voltage with lower current to jump the spark plug gap to propagate combustion in the cylinder. 4,213 Posts . The traditional spark plug uses a "J-strap" design for the electrode that extends over the tip of the plug. of the spark plug boots, MSD offers Pro-Heat Boot Guard, PN 3412. 6. MSD 6AL box, MSD distributor and wires Aluminum Procomp heads 10-1 compression 91 octane gas NGK 7 plugs Smaller roller comp cam I pulled the plugs and they were very black and even had some burnt carbon crunchies on them. The center tip of the plug is made from iridium to promote the best spark and increase resilience. Within the bounds of the ign system. It is recommended to follow the engine builder or manufacturer's specification for spark plugs. Remember, a spark will jump the path of least resistance, which could be a bad plug wire, or a carbon tracked cap or rotor. ok well here's the deal. I'm going to upgrade the ignition even more with new 8.5 msd spark plug wires. At 870°C a spark plug will have a very white insulator nose which will blister if this temperature is exceeded and the ground electrode will melt. I was wondering what was the best spark plug i should go with and the size gapping on my car. In plug lingo, the A-engine used standard plugs and the Magnum used a resistor-type plug. The tests for the upgraded HEI were with 0.055 plug gaps. Re: New HEI for 70's built 350. Yes, .080. I do have a problem with a question about spark plug gap. Gap. The cam is a CBXR280R-10. 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