I was wondering what type of plugs you guys prefer for a mild 355. I took my car to a shop and they told me the Boshe Platinums I am running are not throwing enough spark and tried to see me some new ones. I told them no way cause thoes plugs ar not even a few months old. So are there really any ones better for our motors? I mean as long as they are the right heat range it is just a matter of preferance anyway right? Let me know what u guys run. Thanks aolt

There are an awfull lot of different types of plugs for a small block Chev. What kind of heads do you have what is your compression ratio. I have found that almost all types of plugs will work fine if you get the right heat range. The biggest problem is trying to use a cross reference book one plug is not the same as someone elses no matter what a book says. You may have to play around to get the right heat range when you find it stick with that exact plug.

I have tried every plug that is made and I wouldn't use anything but delco. Just my opinion.

I am useing a stock set of GM casting for heads and I am guessing compression between 9.0-9.5

Most brands are good PROVIDED you use the racing type of plug...these plugs are better made and the heat ranges are more consistant.
The Champion racing plugs are actually very good plugs..unlike thier ordinary junky plugs.. The AUTOLITE racing plug is also a well made popular plug..
For street high performance a projected nose is most desirable... The 59YC Champion racing plug is a good starting point for your situation... The Y indicated projected nose..the C means Copper-Plus Design..
The Champion racing plugs heat range are 51 to 75...and corespond with their normal plugs by a difference of 50...
The old Chevy plugs are J plugs and the newer plug size is V (peanut plug)..
For a good spark get the MSD...you start with the normal gap...then keep incrementing the gap larger(first .01" then .005" increments)...keep increasing gap and you will see increased torque..once torque falls off..then back down an increment..
In Auto-lite Racing plugs... the AR74 would be a good starting point...this coresponds to a Champion racing plug J62YC in heat range..which would be a J12YC in Champion normal plug ( just subtract 50)...
For auto-lite racing plug add 12 to the champion racing # to get the same heat range....
Jetting, distributor curve, plug heat-range must be dialed in together...
Let me know more details about the engine..as much as possible..
For more detailed info feel free to contact me..
CHEERS
Chris

Cerrem,


I have an edelbrock 650 carb with stock jets, an HEI distributer with an MSD coil, I am running about 12* initial and I think it is about 36 total. IF u need anything else let me know. Thanks for all your help

What intake manifold???
Headers????
What heads are you using????? Can you provide casting #...
Flat-top pistons?? Domed?? Dished??
Whats the compression??
What is the cam specs???
What weight is car..approx..??
What gearing??
What tranny???
What applications is this car for...???
What gap are you currently using with the MSD?
What jets and rods are working for you in the carb???
CHEERS
Chris

[This message has been edited by cerrem (edited 05-02-2001).]

[This message has been edited by cerrem (edited 05-02-2001).]

[This message has been edited by cerrem (edited 05-02-2001).]