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Hot street 343 build |
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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That's a good question. In my opinion, I would rather direct the oil to a cam lobe than have it pool up. 017 by Rick Jones, on Flickr Learned this one from Mr. Landis. I drill the 2 holes in the very back to 5/16" and smooth out a channel to make it a little easier for the oil to flow. IMG_4319 by Rick Jones, on Flickr |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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Looking at it, it seems that the drilled holes would direct oil away from the am rather than onto it. All I did with mine was clean up the casting flash on the existing drain back holes, not that there is likelt be any restriction there. Is there any benefit of drilling out the oil return holes in the heads to a larger size?
Would there be any benefit in running a longer rod and a dished piston to achieve some quench in a 343? It seems you have that covered by decking the block and retaining the flat tops anyway.
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5903 |
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The heads drain to the Lifter Valley, there has got to be a lot of oil that collects in the valley at rpm
and in the heads before it drains to the valley. Long time ago Bulltear Matt posted what size the head drain back holes could be enlarged to, fail to remember to what size... I lack real world hands-on, but it just seems with high rpm drainback becomes an "issue"... How many times have you made a mess pouring old oil too fast into a funnel into a jug ? In the Projects Section, the dude with the awesome vintage SCCA BP car, has the Drain Back Lines that go from Valve Covers to the Pan like in the PAS book. In the old AMC TransAm video, when Penske & Mark D. first started with AMC Oil was a problem which once they figured out they did much better, wonder if it involved Drainback? It makes sense, AMC's Oil Pump outlet feeds the Lifter Galleys first, a bunch of oil has to end up on the heads and in the valley faster than it can drain back to the pan... at high rpm anyways... All 16 Lifters in their bores are potential "oil leaks" like loose main / rod bearings... Lifter Bores are seldom bushed, new replacement lifter diameters maybe "compromised" to Mopar size... Not like I "know", but I can just see how, thinking about it... Chevs oiling from the bottom feeding the crank first if it's loose / leaks, less of an issue... And the 3.28 Stroke 290-343 Crank is gonna just beg to be rev'd... And agree, would look at reducing the stock .060 Deck Clearance for better Quench... Then open up the Head Combustion Chambers to unshroud the valves to keep CR reasonable...
Edited by PHAT69AMX - Jun/13/2018 at 6:18pm |
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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Getting that oil past everything that rotates is the best solution. You can EASILY store a few quarts in the valve covers and the back of the lifter gallery under hard acceleration and at high rpm. IMO if you have a roller cam you do not want or need any oil on the cam and crank from above.
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Gremlin Dreams
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Online Points: 6755 |
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Everything is like a pendulum, swings one extreme and back. I like removing all flashings, internal and external, just seems prudent to remove the little pieces that may come loose or start the beginings of a crack.
But here is an old post that goes to the extreme end:
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jpnjim
AMC Addicted Joined: Nov/25/2007 Location: New England Status: Offline Points: 2752 |
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Wow that's one way to "fix" things! Just goes to show, you never really know what the last guy did until you pull it all apart
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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords |
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Boris Badanov
AMC Addicted Joined: Dec/14/2013 Location: NH USA Status: Offline Points: 4209 |
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That seems like a bad idea to me.
IMO Keeping oil OFF the rotating assembly is best. |
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Gremlin Dreams
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gremlinsteve
AMC Addicted Joined: Dec/16/2008 Location: houston Status: Offline Points: 884 |
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I agree
Keep oil off the rotating assembly They make hi performance coatings that help do that |
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67 Marlin
AMC Addicted Joined: Feb/21/2015 Location: Minnesota Status: Offline Points: 876 |
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Any update on this sweet-sounding 343 build?
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pipefactory
AMC Nut Joined: Jul/27/2012 Location: Superior, Wi Status: Offline Points: 405 |
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On hold at this time.
I'm on the hunt for a 71-72 javelin as a driver then put the 343 in it
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Face distorting torque
10.99@121 mph |
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