Glowing red #4&6 exhaust header pipes

[Handy Andy]

Hi guys,I am in the middle of breaking in the 416 stroker in the barracuda today,however i have a slight problem in that the number 4 and 6 exhaust is glowing red in about 4 minutes at 2500 rpm's.I tried advancing the timing and have the same problem,I do have a hydraulic cam with pro-magnum roller rockers,if i re-adjust the preload on the lifters do you guy's think this will resolve the issue.I think these two exhaust valves are hanging open?Any input would be greatly appreciated. I am also running a 750/3310 holley with a proform mainbody,what jet size would be recommended for the 416,as the carb was working great on the 340.an input would be great!

 

[memike]

You may have a couple lifters that are not primed up yet.

 

[SGBARRACUDA]

You will need to fatten the carb up, sounds like it is running way lean. If the exhaust valves were hanging open you would know that as 4 and 6 Wouldn't be making power and the engine would run like crap.

 

[daredevil]

lean or an intake leak . too much oxygen turns cylinders into cutting torch scenario

 

[sumbitmopar]

I'd pull the plugs and take a look. What intake are you running? Percys has a neat dial-a-jet deal that lets you basically do away with the pick-a-jet game and just fatten/lean your carb reall easy. Supposed to work awesome. Me likey! Good Luck http://www.summitracing.com/parts/PHP-15001/

 

[Handy Andy]

I'd pull the plugs and take a look. What intake are you running? Percys has a neat dial-a-jet deal that lets you basically do away with the pick-a-jet game and just fatten/lean your carb reall easy. Supposed to work awesome. Me likey! Good Luck http://www.summitracing.com/parts/PHP-15001/

Im running the m1 single plane with a half inch birchwood spacer,i'll pull the plug's in the morning.

 

[1wild&crazyguy]

start with 74's on the primary and 82's on the secondary if only 1 power valve is used, if both, 74's primary/secondary.

you are vac leaking like crazy to have only 2 tubes red hot!!

btw my 340 with 750 only likes 71-73 which is within 4 jets from stock, consider the carb is too small if it takes more than 4 jets bigger than stock to get the mixture right.

I would have put a 830-850 cfm carb on it.jmo

 

[Handy Andy]

with the proform mainbody,will it give me more cfm's.

 

[ramcharger]

Are 100% sure you didn't mix plug wires?

 

[Handy Andy]

I'll pull the plug's,pull the carb birchwood spacer and check it with a straight edge,and recheck the firing order.It sounds like all the lifter preload is fine as the is no valve train noise.