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Building Another 383 Stroker |
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hohner0006
AMC Apprentice Joined: Jun/10/2016 Location: south dakota Status: Offline Points: 49 |
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I have a couple of questions...How well do the cast 360 cranks hold up? What rpm limit would you put on this combo? Could I use a forged 401 crank to get the same 383 ci but with more strength? I am looking to build something different and this intrigues the heck outta me!
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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.How well do the cast 360 cranks hold up?
I have never heard of anyone breaking one. What rpm limit would you put on this combo? 6500/7000 rpm but, I would limit it to 6000. Could I use a forged 401 crank to get the same 383 ci but with more strength? A forged crank is inhearently stronger than a cast crank hence the reason for one. I have built a couple of those too but photosucket stole my pictures, http://www.ifsja.org/forums/vb/showthread.php?t=141096 |
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stickshifter
AMC Addicted Joined: Jan/17/2008 Location: Bed Rock Status: Offline Points: 573 |
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The 390/401 cranks works great for this application but even better. I bought a "scrap" 390 crank that had a very ugly rod journal from a spun bearing for $50 and used it in my son's 360 stroker engine. Make the journals 2.00" and use standard 6.00" SBC rods. On top I used 400 SCB pistons that I cut a valve pocket in. Came out at 385 inches and 12.5 cr.
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7.03 @ 196 mph
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javelinken
AMC Apprentice Joined: Mar/11/2008 Location: amity pa Status: Offline Points: 95 |
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So am I reading this correctly you went .070 over on a 360 to fit basically a .030 400 sbc piston . I have done close to this going to a 4.125 bore with the 390 crank and having it offset ground to fit the sbc rods and coming up with around 409 cid . If I knew I would of went larger when I did mine
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1968 javelin sst 1966 rambler classic convertible. Now up to 3 quarter midgets
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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Sort of... The first one I built I did use +.030" 400 chevy pistons at 4.155" bore and had Stickshifter cut the correct valve reliefs in. The problem was, they were hyperutectic pistons which do not like detonatio so, I broke a piston. From then forward, I have forged pistons made to specification. Problem solved. The common 4.155" bore allows for better ring choices. Plus, most 360 blocks could even go to the 390/401 bore at 4.165" if the engine has to be gone through again. Edited by SC397 - Apr/24/2018 at 6:04am |
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javelinken
AMC Apprentice Joined: Mar/11/2008 Location: amity pa Status: Offline Points: 95 |
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Ok wish I knew that . When mine was done in the early 90’s the shop that did my motor did a lot of dirt track motors and my pistons and rods were out of one of there motors so I got a decent deal on parts
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1968 javelin sst 1966 rambler classic convertible. Now up to 3 quarter midgets
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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It's alive. 360 bored and stroked to 383 cubes, Comp 270H cam, Air Gap intake. IMG_0184 by Rick Jones, on Flickr Coolant passages flushed 4 times, antifreeze added, 2 gallons of gas ran through it, time to re-torque head bolts and change the oil and install a MSD distributor. This engine will end up with fuel injection.
Edited by SC397 - Jul/25/2018 at 12:12pm |
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1982AMCConcord
AMC Addicted Joined: Jul/13/2012 Location: Kenosha, WI Status: Offline Points: 1286 |
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SOUNDS HEALTHY!!!!!!!!!!!! Good work!
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asifnyc
AMC Nut Joined: Apr/30/2008 Location: SF Bay Area Status: Offline Points: 390 |
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I broke one!!! missed a shift in my road race Javelin. trying for 4th, got 2nd tell tale tac said 9k+ timing chain broke on my way back to the pits... crank was cracked.
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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You forgot to post up the rest of my comment. What rpm limit would you put
on this combo?
6500/7000 rpm but, I would limit it to 6000. |
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