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I want to install my harmonic balancer this weekend on my 340/420. I have the balancer installation tool and I have torqued the balancer bolt with the engine in the car a handful of times. I made a bracket that bolts to the balancer, and rests against the k-frame to keep the crank pulley from...

Anyone running into issues with valve spring delivery dates? I ordered a set of Manley springs/retainers/locators 5 weeks ago and the retainers/locators delivered in 3 days. I am now approaching week 6 for the valve spring back order and still have another 4 weeks to go. I have 4 other valve...

I am thinking ahead of what type of coolant to run once I get my 340/420 back in the car this Spring. The engine was completely cleaned, and my radiator and intake were cleaned out too and sitting dry. I will be using new radiator hoses, and then the only other pieces are the heater core/hoses...

I have started assembling my 340/420 and I need to start deciding on which intake to run. I currently have the following two intakes: Non-Airgap RPM Weiand X-celerator (small single plane) I have gasket matched both of these to the same intake gaskets, and the depth of the match is about the...

I just installed my cam and with the sprockets at Dot-To-Dot, the centerline comes out at 109 which matches the cam card separation angle. The card says to degree it in at 105. Do I just advance the cam sprocket 2 degrees and check the centerline again? Thanks!

I have my cam on order, and I have my recommended spring specs (145-150lbs & 350-360lbs). I have my springs chosen (“ISKY” 6105-SP) and now I am trying to dial in my installed height (on paper, as I will check my actual lifts after the cam install). I was told by the cam company that the new...

The new crank in my 340/420 did not come with a crankshaft key for the harmonic balancer. So, I pulled the key out of my OE 340 crank and deburred/installed it, and the height of the key is too tall for my balancer. It appears to be too tall by apx .012-.018” along the key. Is this a fit to...

Windage Tray location up/down: I am installing my windage tray on my 340/420 bottom end. I now have the ARP main cap studs that have the 3/8”-24 mounting studs for the tray. These are fully threaded so that the tray can be moved up/down to fit under the pan. My main concern is, do I need to...

20 months ago, I lost oil pressure in my 340 (70 Challenger numbers matching) and found that the oil pump internal components had many scars, the oil pump screen was full of crud, the thrust surface on the crank was ate up, and my main bearings were toast. (Please keep in mind that the bottom...

This plug is leaking and I need to remove it and reseal it. When I remove it, do I need to expect a lot of fluid to pour out or a little bit. Thanks

I have had my 340 out of the car for several months now while waiting for the machine shop to finish the bottom end rebuild. As soon as I pulled the engine out, I supported the converter with a closed end wrench bolted onto the housing at approximately the 10:00 position on the housing. The...

I am looking at two valve springs for a possible upcoming cam swap. This will be for a solid flat tappet that will max out around the 6300rpm range with 1.65 rockers. Note: I have been told in the past that the 1.65 rockers will need a little more spring pressure versus the 1.5 rockers. The...

If you are selecting a crank/rod combo (340), and both the Mopar and the Chevy journal size is available, which do you choose and why? I understand getting the matched set, but why one over the other? Weight of the different size journals versus the intended rpm? Thanks!

This question pertains to which directions do I need to open the pushrod holes for extra clearance when swapping from a SFT to a SR cam. I am trying to get some of the dirty work done before my rotating assembly is ready (340/418) at the machine shop. I now want to try and open the push rod...