When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So I was talking with the brodix rep and he suggested either the champion RN12YC or the Autolite 3924 if I am running pump gas for the IK200 aluminum heads. Previously I had the 461 camel hump heads with unknown spark plugs. Is it crucial that I change to the new plugs or does it not matter? Are there problems I could run into or could currently be experiencing because of it?
My mechanic who built the initial setup put in these plugs probably about 8 months ago and he made spark plug wires since the ones that came with my ebay HEI were too short with the guides.
AP 3924 is a deep 3/4 inch reach 14mm. Which I use in my heads. Used in all the aftermarket aluminum heads. Peanut plugs in old iron heads is a completely different animal!
my apologies, I have no idea what spark plugs are in there now. I never bothered to look until recently when I changed the heads. I have a picture of the plugs when they were removed during the head install if that helps at all? Otherwise I will take a look when I get home and see if I can read any number on them.
So you are saying your mechanic may have put in the old plugs from the 461 heads into the new aluminum heads?
I think that may have happened. I assumed he'd change them along with the heads and I completely forgot to ask but now I'm wondering maybe he didn't because of the sluggish acceleration, black exhaust pipes, difficulty starting sometimes and just the fact that it doesn't feel as fast as it should with all the mods done to it.
Lets hope not!! 3924s are a good plug been using them forever.
from that pic I posted they look like accel 576 plugs, that's my best guess but i'll confirm once im home. The 3294 is brodix recommended for pump gas and they aren't super expensive. I'll just get a set and eliminate that potential cause of the hesitation problem.
from that pic I posted they look like accel 576 plugs, that's my best guess but i'll confirm once im home. The 3294 is brodix recommended for pump gas and they aren't super expensive. I'll just get a set and eliminate that potential cause of the hesitation problem.
See what you have first and if they are not the right plug I would try one of the others. I would suspect your hesitation would be timing and then possibly carb related before spark plug though.
See what you have first and if they are not the right plug I would try one of the others. I would suspect your hesitation would be timing and then possibly carb related before spark plug though.
Yup the carb definitely needs further tuning, the timing may possibly be somewhat conservative best guess
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Never used Autolite. Wouldn't use Champion. I have used AC Delco Rapid Fire but now use NGK v-groove FR4's in my AFR 195's. My 355 seems to run a tad better with them.
Never used Autolite. Wouldn't use Champion. I have used AC Delco Rapid Fire but now use NGK v-groove FR4's in my AFR 195's. My 355 seems to run a tad better with them.
Is there a way to equate the NGK plugs to the Autolite ones?
Nvm I compared them on summit, only diff is the electrode tip which is nickel for NGK and copper for auto lite. Is your motor NA or forced? also what octane fuel do you run?
Lastly are these plugs compliant with the MSD 6AL? I read on summit that some people were concerned with the engine missing.
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
There are lots of cross reference charts available. Just google spark plug cross reference. Mine is NA and 91 is the best octane available here in NS. I used the NGK with my old Mallory Maxfire which was a CD ignition.
The al3924 is a heat range 4. I’m reading online that the higher the heat range the less performance oriented the plug. Is this true? If I were to go with a platinum plug could I just get any plug that’s heat range 4, 14mm and 0.750” reach?
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
Be very careful with heat range numbers. Some plug makers have higher heat ranges in ascending plug numbers e.g ACDelco while others have higher heat ranges with descending plug numbers like NGK. You need to monitor the plug colour to get the correct heat range. AFR recommends certain plug heat ranges but they also say that's just a starting point. Hotter or colder plugs maybe required. Hence, monitor plug colour every few hundred miles or so and take it from there.
spark plug q
