# Stroked 318

**URL:** <https://59plymouth.net/t/stroked-318/3812>\
**Category:** Much Ado About Nothing\
**Created:** [April 26, 2022, 1:45pm UTC](https://59plymouth.net/t/stroked-318/3812 "2022-04-26T13:45:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RICKYMOPAR](https://59plymouth.net/user_avatar/59plymouth.net/rickymopar/32/35_2.png) [@RICKYMOPAR](https://59plymouth.net/u/RICKYMOPAR)\
**Post date:** [April 26, 2022, 1:45pm UTC](https://59plymouth.net/t/stroked-318/3812/1 "2022-04-26T13:45:34Z")

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![Stroked 318 LA in Bronco colors.jpg](https://59plymouth.net/uploads/default/original/3X/8/6/86680a8e47f3b0d5dcd35ce7a1dda39056570474.jpeg)

**Posting pictures of an engine I modified, for my son’s ride. It is an LA series engine, 318 that is stroked to 390 CID. Our son is a big Denver Broncos fan.**

 ![Parts used during modification.jpg](https://59plymouth.net/uploads/default/original/3X/7/f/7f09b9c6dd81199647380793cbbfb9ed3b139c9c.jpeg)

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**Author:** ![Faulkner](https://59plymouth.net/user_avatar/59plymouth.net/faulkner/32/21944_2.png) [@Faulkner](https://59plymouth.net/u/Faulkner)\
**Post date:** [April 26, 2022, 2:03pm UTC](https://59plymouth.net/t/stroked-318/3812/2 "2022-04-26T14:03:07Z")

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I’m guessing the Broncos comment has something to do with the engine color, Rick? 😉

Tell us about stroking an engine. Boring to oversize seems like a straightforward way to increase displacement, but how do you stroke an additional 72CI?!? Did you replace the crank?

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<div class="post-metadata">

**Author:** ![RICKYMOPAR](https://59plymouth.net/user_avatar/59plymouth.net/rickymopar/32/35_2.png) [@RICKYMOPAR](https://59plymouth.net/u/RICKYMOPAR)\
**Post date:** [April 26, 2022, 2:46pm UTC](https://59plymouth.net/t/stroked-318/3812/3 "2022-04-26T14:46:05Z")

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**This was the original engine for Kevin’s Challenger. The over bore is .030 or 3.94 and the new stroke is 4.0 original is 3.31.  
Mopar performance or Direct Connection crankshaft was utilized.  
Icon forged pistons with relocated pin boss for increased stroke.  
Eagle 6.123 H beam rods, standard length, performance mod.  
Comp Cams mild performance torque enhancement cam kit, including double roller timing chain.  
factory original adjustable rocker gear, raised .060.  
2.02 intake valves and 1.065 exhaust for better breathing, mild port mods.  
Picture of old heads and copper washers being modified to correct rocker arm geometry.  
Later model 340/360 heads were used on engine to increase performance.**

 ![.060 spacers for rocker shafts.jpg](https://59plymouth.net/uploads/default/original/3X/1/7/17293d137c941a673fd2b063d1a4f81166d3b5f1.jpeg)  
 ![LA 273 318 340 360 adjustable valve r.jpg](https://59plymouth.net/uploads/default/original/3X/f/e/fed27da349ea26e6d4ee0a4166442b5748677af7.jpeg)  
 ![Kevins 71 Challenger.jpg](https://59plymouth.net/uploads/default/original/3X/4/b/4b5164442310c77e1315aaf562707f64006dd433.jpeg)