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That statement is so true. My engine had 140,000 miles (230,000 km) and I reused 15 of my lifters. This is the only one I replaced, for obvious reasons:

When I search "Comp 901 spring magnum" this old Moparts post is one of the results. One guy says the 901s will work, another guy chimes and in and says they won't work without machining, another guy steps in and says they will work... Yup, that's the internet alright. I bought the Hughes...

I would struggle with the idea of using that head. But I would be interested in hearing about others' experiences on this. Given that they are almost always cracked you can normally find them pretty cheap, so you might want to check the local classifieds / Marketplace and see if you can find...

I'm usually the first guy to say you can run cracked Magnum heads without any issues. 6 out of my 8 cylinders had cracks, and I'm not worried in the slightest. But your picture shows a deep and substantial crack! Do I also see another crack going horizontally, at the bottom of the vertical...

Exactly, it's not about saving the money on fuel. But... I've had the OD for exactly 2 years and put on 8500 miles. At this rate it would take me another 4 more years to to hit my break even point.

Yup, you nailed the maths. My recent OD install was about $3500 CDN , but I had some help so it's likely closer to $4500 CAD for the average guy. $4500 CAD = $3200 USD. Here's how I came up with 85,000 km to make up the difference in fuel costs: I went from 16 mpg with a 904 to 19 mpg with...

I recorded a video but it was trash. Maybe I'll try it again. Sounds like a well thought out build. The 3.55 + 2.74 1st would be great for me. I lost a bit of low end torque when I put on the short runner M1, so the 3.23 + 2.45 1st isn't quite as torquey as it was before. I have a 2500 rpm...

If you truly drive the car "a lot," overdrive is really the way to go. I think you have to ask yourself: How much would it cost you to re-gear the diff? And how much would it cost to have an overdrive transmission installed? And what's the difference between those two numbers. You will...

Yeah, 2000 rpm makes sense. Assuming a 26 inch tire, the math says you're at 2050 rpm at 65 mph when after the converter locks, so probably around 2300 under light acceleration at 65 mph. Is your torque converter stock? Those 3.55's must be nice! The 3.23 is way low (high?) for me, but I...

I find it interesting that you have your OD set up to lock so late. What differential gear are you running? I had that same type of pressure switch setup in my car with a 46rh. I had the pressure switches adjusted for "normal" acceleration, so it went into OD at about 50 mph and lockup at...

For sure. I used to have a 62 Falcon with a 200 cid six cylinder. After I got it I drove it around for a few months without any issues. It never got hot, but I noticed the seal on the rad cap was gone, and had probably been gone for years. I'm sure it was not putting the system under any...

I agree, I love the lines, fender flares and the overall 80s vibe. After the mid-80s most cars started to look more and more like a worn out bar of soap. Unfortunately it's an analog dash, I would have loved to get a digital one. That digi dash is peak 80s awesomeness. It was Toyota's halo...

Super comfortable seats! Almost makes up for being so s-l-o-w :D Most of my muscle car buddies don't really get it. For me it's the strong 80s nostalgia, and and cool car is a cool car no matter who made it. This pic is from when it had Coopers on the front and BFGs on the back; they are...

Maybe I should have said the front tires will age out before the tread is gone :D

+1 for the Coopers over the BFGs. I had BFGs on my Dart and replaced them with Coopers about 4 years ago. Like @RustyRatRod said, the Coopers are a bit softer and seem to wear out more quickly, and the grip is slightly better. But for most of us they'll age out before the tread is gone. I...

Yes, 100% the OP should check the rod bearings. I was lucky in that mine looked fine. My cam bearings, maybe not so much. Actually they all looked great except for one. Check this out: At first I thought I did that when pulling out the cam, but the cam had a shadow on that journal right...

In this context I meant short block. Definitely not referring to torque.

You already have tons of good advice here. I'll add my $0.02 based on my experience. I put a 150K+ mile 5.9 in my Dart. The cylinder walls and heads looked pretty much like yours does. - I did not touch the bearings or the rings, and I did not hone the cylinders. - All I did to the bottom...

I had the same issue. I think the dash lighting was just poorly designed. I did the LED strip lighting upgrade. The gauges are actually visible now while driving in the city at night. I did several posts in this thread on the lighting the cluster, but you can check post 57 and 61 for the...

Nice!! It's good to see you getting things resolved.

I was careful to get the smaller pump that supports "only" up to 450 hp. I figured it would be a miracle if I could get a factory Magnum anywhere near 450 hp, so the small pump would be fine. Because with fuel pumps bigger is not better if you don't need it. I've heard a pump that supports...

Thanks, I really tried to make everything as serviceable as possible - ideally with parts that are on the shelf at the local parts store. The filter's output is a male quick connect, so I used a female quick connect to -6 AN fitting, like Vibrant Performance # 16886. It found a pic on my phone...

Here's a pic of my tank and the fuel lines. I can't remember the brand of hose and fittings I used, maybe Earl's. You can see I got quick connect adapter fittings to with fuel regulator. The third pic is the filter / regulator mounted above the diff. If you look closely at the regulator you...

When I was running the non-lockup 904 with my 5.9 engine, Hughes cam, kegger intake, stock throttle body, and a 3.23 gear I got a solid 16 mpg. I would think that you should be way better than 10 - 12 with your setup. And of course the rich smell shouldn't happen in the engine is running in open...

I was asking about fuel pressure because I know those GM filter / regulators operate pretty high (58 psi?) and the OBD1 Magnum spec is 35 - 45 psi. I don't know if your higher fuel pressure would cause the low RPM stumbling issue, but it's something to consider. Maybe it's pushing fuel past...

Have you measured your fuel pressure at the rail?

Thanks! I'm pretty happy with how it came out. I got the buttons from here: Billet Automotive Buttons - Design your own custom billet buttons 12v I got these ones: 19mm 'CRUISE CONTROL SET' Billet Push Button Switches Car Universal This OD button: 19mm 'O/D' Billet Push Button Switch...

No problem, I did my first ever build thread for the cruise upgrade: Rewiring my EFI Magnum - 1970 Dart Swinger You might find I got a little side tracked and did several upgrades that weren't part of the original plan. If you're short on time most of the cruise control stuff is on page 2...

Seems like me and DionR are speaking the same language here :D

I don't often buy from forums or online groups for that very reason. When I do take that risk I use Paypal goods and services and pay the extra fee. So far I have been lucky and haven't been burned trying to buy Mopar parts or parts for my 85 Supra. Yet. I was asking because I didn't use a...