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It's normal. Those holes go directly into the water jacket. Use a good thread sealer and you will be good to go.

No box, just the ready to run distributor.

And before somebody says anything, I was running a 750 vacuum secondary Quick Fuel carb when I ran it at the track and it started the backfiring with that carb and now I have an AED 750 mechanical secondary carb. Same problem with both carbs.

I am running an MSD 8388 Ready to run distributor with MSD Blaster 2 coil.

Thanks for the info. I will see where this gets me. The carb is brand new, I just got it yesterday from AED. I know that means nothing, but I thought you would like to know.

I changed nothing! It's at wide open throttle only. It has a surge when you are cruising but no backfiring. The coil is brand new but that may not mean anything. It's an MSD blaster 2.

It's a walbro 255 lph electric that's in my tank. I use a Aeromotive regulator set at 6 psi.

It's a mechanical secondary carb.

I also reset the preload on the lifters at .030 again just to make sure it was good. I started it up before I did this a little earlier and when I revved it up and got into the secondaries it back fires through the carb.

It advances to 50 degrees with the vacuum hooked up. Without it is 18 initial and 18 mechanical for 36 degrees total.

Thanks for your input I will check it out.

My plugs are all sooted up (very black). They are new plugs and I don't have maybe 5 miles on them.

I'm running ported vacuum. The mechanical + initial is 36 degrees without vacuum hooked up.

I have been building a 74 dart sport that I put a magnum 360 in and I am running into a problem. I don't know if it is fuel or ignition. Let me give you the specs. 1995 magnum 360 block LA Edelbrock heads w/ stage 2 porting from Mike at MRL 1.6 hughes shaft mount roller rockers...

I double checked my bolts and they are all the same length. The box has the right number on it but I think I got the wrong bolts. I will go back to ARP and see if I can get the longer bolts. Thanks for everybody's help!

Thanks, I will double check the length.

Are you saying I need studs not bolts?:)

Maybe that's the problem. I bought my heads from Mike at MRL and I didn't get head bolts with them.

Part # 144-3601 shows fitting LA heads, but since I am using a magnum block I don't know if I need the magnum bolts or the LA bolts.

I have the Edelbrock 60779 heads for my 360 and I know that they recommend a longer bolt on one of the holes on each head. I bought the ARP head bolts part# 144-3601. This part number doesn't have any bolts that are longer than the others on the inside of the head by the valves. I have LA...

Thanks for the help earlier. I have another question. I ordered them and installed them. Fit great. My question is since I added the .030 do I need to add any more preload or is the .030 the preload?

It was square decked, but I will check so I know for sure.

Yes they are. Mike at MRL took care of it for me.

It's a hydraulic roller. I will double check my measurement. Thanks for the advice.

Thanks! I have adjustable rockers and what you describe is how I did it.

Thanks, I appreciate the response.

I am a bit confused on the correct way to measure for custom pushrods. I have a 95 magnum block that has the cylinder head oiling hole already there so I am running LA Edelbrock heads that were set up and ported by Mike at MRL. I'm running the Hughes shaft mount 1.6 roller rockers. The cam is...