TheGrimSpeed
Well-Known Member
Do you have a link to a valve spring compressor tool that will work with magnum heads?
High RPM Backfire when fully warmed
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TheGrimSpeed
Well-Known Member
I’m think I would need to buy these type of studs to use that pedestal valve spring compressor tool, just got to figure out the thread size on the rocker bolt
I think it would be this 5/16x3/8 and I can use that compressor tool easy
I think it would be this 5/16x3/8 and I can use that compressor tool easy
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Inertia
Well-Known Member
I didn't think I'd ever see adjusting bleeds like that again.
Thank you, I actually have an ancient kit to measure/adjust bleeds lol.
TT5.9mag
Two atmospheres are better than one
You know it’s a great way to do it. We used to tune for different track conditions with wire in the HSAB. I have never personally had to do it with IABs though. That was a first. And as soon as I realized what was going on I yanked em out and pressed new .070 ones in. Then we thew a different carb on it.
TheGrimSpeed
Well-Known Member
installed a 80 jet in the rear! And same deal after it was warmed up she started backfiring @5200-5500 when she was cold there was no issue.
Although that 80 jet made the engine happier.
So what I have left to do, I ordered a cap and rotor and new plugs and wires. Car needed all that regardless, and a ignition coil swap. I currently have the msd blaster 2 coil with their ballast resister. After all this and it still has the issue going to order Hughes valve springs and 1 of their 5/16 to 3/8 rocker studs (so I can use that valve spring compressor tool) already have there locks and retainers. Let’s see how it goes
Although that 80 jet made the engine happier.
So what I have left to do, I ordered a cap and rotor and new plugs and wires. Car needed all that regardless, and a ignition coil swap. I currently have the msd blaster 2 coil with their ballast resister. After all this and it still has the issue going to order Hughes valve springs and 1 of their 5/16 to 3/8 rocker studs (so I can use that valve spring compressor tool) already have there locks and retainers. Let’s see how it goes
TT5.9mag
Two atmospheres are better than one
Good test. On to the next. Ignition
Did you post a picture of the plugs yet?
TheGrimSpeed
Well-Known Member
I believe members were saying because of metal expanding due to heat?
TheGrimSpeed
Well-Known Member
Yes have and you commented it looked like it was on the hot side.
TheGrimSpeed
Well-Known Member
Guys I guess I was wrong I was looking through my emails and found that yes I indeed buy the Hughes updated spring kit in full, with springs keepers and retainers.
I guess my issue is either with fuel or spark!
I guess my issue is either with fuel or spark!
TheGrimSpeed
Well-Known Member
What a relief
MOPAROFFICIAL
If it has tits, it's a liabilititty.
A regular old screw type spring compressor from the part store should work.
Duralast Valve Spring Compressor
TT5.9mag
Two atmospheres are better than one
Well that’s interesting. You should have enough spring. My thoughts immediately go to your Chrysler ignition module.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Did you install them? What height were they installed at?
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Check your firing order.
If it were a needle n seat.. it probably would wanna die at idle from being drowned in fuel. The factory box .. I quit using those .. something about them pulling timing or duration about 5k.. I can't remember anymore. Is it the 5 or 4 pin?
Sometimes I assume people have the basic **** covered by the time they come here asking for help. If This Were your typical roller, those hughes Springs would not be enough.. but because it is a magnum core with a giant base Circle, the Springs work okay.. or should. Factory valve lift at about .420- .432 or whatever only used 90 seat and 200 open... so should be good you'd think.
Still confused as to where the 901 spring mentioned fit in.. as where you say you bought the Hughes springs, was that after or ... what spring is in the head???
If it were a needle n seat.. it probably would wanna die at idle from being drowned in fuel. The factory box .. I quit using those .. something about them pulling timing or duration about 5k.. I can't remember anymore. Is it the 5 or 4 pin?
Sometimes I assume people have the basic **** covered by the time they come here asking for help. If This Were your typical roller, those hughes Springs would not be enough.. but because it is a magnum core with a giant base Circle, the Springs work okay.. or should. Factory valve lift at about .420- .432 or whatever only used 90 seat and 200 open... so should be good you'd think.
Still confused as to where the 901 spring mentioned fit in.. as where you say you bought the Hughes springs, was that after or ... what spring is in the head???
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TheGrimSpeed
Well-Known Member
Well that’s interesting. You should have enough spring. My thoughts immediately go to your Chrysler ignition module.
I was thinking the same, I’m trying to find a good upgrade but it seems like they’re all Chinese junk. Holley sells reman MSD boxes I just bought one for $115 shipped. That would eliminate my ignition issue, also an upgrade I been wanting to do.
I was thinking the same, I’m trying to find a good upgrade but it seems like they’re all Chinese junk. Holley sells reman MSD boxes I just bought one for $115 shipped. That would eliminate my ignition issue, also an upgrade I been wanting to do.
TT5.9mag
Two atmospheres are better than one
Some guys have bad luck with MSD and will bash it, i tend to blame piss poor installation and wiring practices. I however love their stuff and have very good luck with it. Follow the directions to a T and you’ll have no problems.
TheGrimSpeed
Well-Known Member
The machine shop that I go to installed them, that’s a unknown variable as well.
I checked the firing order, yesterday when I rearranged my wires in the engine bay. The module is the 4 pin style a rock auto special.
So the 901 springs were for a 318 build I did with adjustable 273 rockers and heads. The camshaft was a stock 340 grind type from comp cams.
TT5.9mag
Two atmospheres are better than one
A quick and easy ignition upgrade is to use your existing electronic distributor, a GM HEI module and jump the ballast resistor. I made a small mount/heat sink for the bottom of my distributor and run one on my D100. Cost $35 from Napa and is super easy to wire in.
TheGrimSpeed
Well-Known Member
Do you use a stock style cap and rotor just upgrade cables? And open plug gap to .045?
TT5.9mag
Two atmospheres are better than one
Same cap, rotor, and plug wires. I didn’t even touch the plugs. I’ve seen plug gaps tested from .020 to .100 on the dyno make zero difference, so I don’t worry about em. Mine I think are .035 currently.
Inertia
Well-Known Member
Absolutely agree. . . .
Change all my Mopar builds to this ignition .
Instant start every time, revs to 7k.
Plug gap 45 .
TT5.9mag
Two atmospheres are better than one
Everything street driven I use the HEI on. It’s very hard to beat.
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