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290 pistons |
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poormansMACHINE
AMC Addicted Charter Member Joined: Jun/28/2007 Location: Shoemaker-Levy9 Status: Offline Points: 12302 |
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290 through 401 have the same bore spacing so if it's lacking then they're all lacking.
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Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2725 |
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SHHHHHHHHHH!
Some Chevy guy probably told him that...so it's just GOTTA be gospel!
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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17tamx
AMC Addicted Joined: Dec/23/2008 Location: Peoria, AZ Status: Offline Points: 1170 |
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Isn't the bore spacing the same between a 290 and a 401? Bore spacing is based on the dimensional limitations of the basic engine block design. The AMC thinwall casting Gen II and Gen III V8's originally designed by Dave Potter are neither small block or big block but really a medium block. The external dimensions are the same for all the engines. The internal dimensions of the castings where changed as both bore and stroke increased to give larger displacement numbers.
Don't we have 4.40" Bore spacing on our AMC Gen II & Gen III V8's? I hear about guys running 4.225" (4.165 plus .060) on their 390 and 401's all the time. Is anyone running a larger bore than 4.225" at this time? Edited by 17tamx - Oct/01/2011 at 11:36pm |
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Kirk P. Fletcher
70 AMX BBG w/Shadow 390 4sp 71 SC360 Wild Plum Ram Air 4sp 67 Rogue Convert 343 4sp 66 Rogue Hardtop 290 Auto 66 440 Convert 232 Auto |
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wantajav
AMC Addicted Joined: Sep/04/2009 Location: PA Status: Offline Points: 1150 |
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bore spacing = distance from bore center to bore center, not the diameter of the bore itself
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wantajav
AMC Addicted Joined: Sep/04/2009 Location: PA Status: Offline Points: 1150 |
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4.75" the same as a Buick 400-455
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jonb79
AMC Nut Joined: Aug/27/2011 Location: Milwaukee Status: Offline Points: 274 |
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Correct me if I'm wrong but isn't the bore on a 290 3.75 and the stroke 3.28.
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wantajav
AMC Addicted Joined: Sep/04/2009 Location: PA Status: Offline Points: 1150 |
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four 3.75" holes that are located 4.75" apart in the engine block.
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bigbad69
Supporter of TheAMCForum Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6668 |
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Nowhere in this thread have you mentioned the purpose of the car. Is it street, street/strip, or race only? That makes a big difference on the engine you build. Street performers really need low end grunt because you can't achieve high RPM for very long. For street/strip you want a wide power band to take advantage of higher RPMs but still have low end for the street. For race only, you have to decide what class you want to be in, then build the engine (and car) specifically for that class. A guy I know has a 318 in his Dart (street only). It has 340 heads, an upgraded cam, intake, and carb. He says it runs like a 340 and he's right. But that's a lot of work to get it to the level of a stock 340. If he started with a 340 or 360 and did the same work, he would be in the range you are looking for. |
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69 Javelin SST BBO 390 T10
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poormansMACHINE
AMC Addicted Charter Member Joined: Jun/28/2007 Location: Shoemaker-Levy9 Status: Offline Points: 12302 |
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Are you sure you're ready to build an engine?
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jonb79
AMC Nut Joined: Aug/27/2011 Location: Milwaukee Status: Offline Points: 274 |
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Im going to build something for the street and once inawhile at the strip. Most likely going to buy a 360. love that chevy guy comment.
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