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To my knowledge the cracks are generally harmless. I'm sure there are exceptions. My thought is not to repair them. Run them or replace them with aftermarket heads. I suspect a repair would not last. Just my guess, not from experience. Others will chime in.

Got it. If they weren't so spendy every exhaust system would have them.

Very nice work. The v band exhaust is interesting. Can you talk a little about that?

This thread is about the 5.9 Magnum flywheel. 5.9 Magnum flywheel - DIY with bolt-on weight??

For the sake of anyone planning to try this, the diagram should be clearly labelled, MAGNUM, or LA. Also, the angle on the drill point should be specified in order for it to be accurate.

very interesting. We had quite a few folks searching for that spec on the other forum and nobody ever came up with it. Hence the rigmarole. Where were you back then? #-o:D

You get the credit for this one. Hopefully the math holds up.

I used the method in the link above to draw a parallelogram with 3 vectors, one for each hole in the flywheel. I set the center vector at 100 mm. The two other vectors came out to 63 mm and 64 mm so I used .635. Here's the calculation. Total weight = 4.65 oz. 4.65/3 = 1.55 oz per hole. The...

Perhaps. But I think not. I believe the combined weight removed will act at the center of the area from which it was removed as if it were removed from one large hole at that point. I could be wrong. We need a physics major. Edit: Been a while since I did physics but after posting the above...

You can run the 833 but will need a bellhousing, clutch, pedals etc. The flywheel is fairly spendy. Here's some info on that. http://www.forabodiesonly.com/mopar/showthread.php?t=178065

http://www.magnumswap.com/\ In case you have not seen it, good reference info. Good luck with the project.

If it were my engine, based on what I discovered I would bet that I got it right and I would use one. I might do a minor balance adjustment for peace of mind. That said, without having done it, I would not recommend it for you because of the possibility I got it wrong somehow. If you read the...

http://www.moparchat.com/forums/showthread.php?t=71263&page=5 That post has lots of info on the flywheel issue. See my results on post 53. http://www.forabodiesonly.com/mopar/showthread.php?t=178065&highlight=magnum+flywheel This is the shorter version on this forum. Bottom line, my results...

Been thinking about this as well in choosing a cam for my 5.9 build. I know aftermarket pistons that come up to deck height have valve reliefs. The stock pistons are down .050 and have no reliefs. I'm planning to do the clay test with one of my new IMM heads using the stock cam. I think I will...

Yes I did. Impressive.

Joe, I've got the same build with RHS heads waiting to go. Mine will be a 4 spd, shortened .410 8.8. Yours was part of the inspiration, in fact through the pm grapevine some of your advice was passed along to me so thanks for that. Looking forward to see how this one performs. :coffee2:

My 5.9 had max .004 wear at about 80,000, well within rebuild tolerance. I think the wear has to do with fuel injection. I'll let others comment further. I'd only buy in advance if you're OK with re-selling if necessary. How much are you saving?

Really interesting. Not something you see done.

Kinda sounds like a repeat of the "junkyard jewel" article which claims 448 hp using eddy heads. TQ was down a little at lower rpm (373 @ 3000, and peaked at 434 @ 5000). http://www.hotrod.com/techarticles/engine/hrdp_0804_small_block_mopar_engine/viewall.html

I'll say heads. Tails anyone? :)

The truth is I think like your quote above. I'll build it my way, and encourage others to do it their way. I'm really just inserting some humor, and giving respect to members who know far more than I and dislike the Thumpr. I do believe the Thumpr cams are a compromise of sorts, but not...

Interesting... recently finished up a shortened 8.8 with .410s for my Dart. I've got a junkyard 5.9 and a set of RHS heads waiting to go on. I'm hoping that combo will piss lotsa people off :D I have to admit I want the lopey idle... was considering a thumpr (oh the shame :angry7:) but tire...

Just did mine with a strap wrench, wife holding with long pipe extention, large crescent and dead blow on crescent. Would be much easier before the belt is removed. :banghead:

Thanks. Perhaps I'm being conservative. I like pleasant surprises :) I'm going to offer them for $100 plus the ride with full disclosure. I hope someone local can use them. Were yours cracked?

Thanks Rob, and to all who replied. The conversation is useful.

OK, I get it. Makes sense to me. I'll comment further below. The post title says it :) I think the question has been answered well enough. I'll put them up for sale cheap. But the conversation is informative. It's interesting to see the different perspectives. So I'll keep it going a bit... I...

Thanks, that's some very useful information. More than I came up with searching for info online. I'm not sure what you mean by that last sentence. Could you explain? If I were considering using them myself I'd do that. Not worth the bother and expense for what they will sell for.

My understanding is EQ and RHS are very similar. For me it comes down to getting a complete package with quality components and build. I'm planning to purchase from Brian at IMM. If I recall, the EQs are cast in your neck of the woods, correct? Not sure on RHS.

These came off a 5.9 Magnum that will be getting a set of RHS heads for my project. They are a reman head, mileage uncertain as I'm not sure when in the 78,000 mile life of the truck they were installed. With 2.0 reading glasses and a magnifying glass I was able to detect cracks between the...

I'll have a set off a 5.9 Magnum with 78,000 miles shortly for cheap if you're interested.