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LA or Magnum #509281 10/27/09 09:32 PM 10/27/09 09:32 PM
Joined: Feb 2007 Posts: 231 Cumberland County, NJ coronetkid OP enthusiast
coronetkid OP enthusiast Joined: Feb 2007 Posts: 231 Cumberland County, NJ	how do i tell if the 318 in my truck is a LA or Magnum? it's not the original motor and i don't know what year it is.

Re: LA or Magnum [Re: coronetkid] #509282 10/27/09 09:44 PM 10/27/09 09:44 PM
Joined: Feb 2007 Posts: 231 Cumberland County, NJ coronetkid OP enthusiast
coronetkid OP enthusiast Joined: Feb 2007 Posts: 231 Cumberland County, NJ	or perhaps a Poly?

Re: LA or Magnum [Re: coronetkid] #509283 10/27/09 09:51 PM 10/27/09 09:51 PM
Joined: Oct 2009 Posts: 266 Seattle Wa PowerWagonDude enthusiast
PowerWagonDude enthusiast Joined: Oct 2009 Posts: 266 Seattle Wa	LA has 5 bolt valve covers. Magnum has 10 bolt valve covers. Poly has a scalloped lower valve cover rail 5570918-P71005.JPG (39 downloads)

Re: LA or Magnum [Re: PowerWagonDude] #509284 10/27/09 09:53 PM 10/27/09 09:53 PM
Joined: Jan 2003 Posts: 2,111 Bowie, MD R Reggie top fuel
Reggie top fuel R Joined: Jan 2003 Posts: 2,111 Bowie, MD	Quote: LA has 5 bolt valve covers. Magnum has 10 bolt valve covers. Poly has a scalloped lower valve cover rail Ditto. Also, a Magnum has rectangular shaped valve covers and vertical intake bolts. Unless the intake has been swapped for an aftermarlet unit, a Magnum will have a tall "beer barrel" style intake. The Magnum block should also have a mounting boss on the passenger side for a crank trigger. LA engine will have rounded end valve covers and angled intake bolts. Last edited by Reggie; 10/27/09 09:54 PM.

Re: LA or Magnum [Re: Reggie] #509285 10/27/09 10:32 PM 10/27/09 10:32 PM
Joined: Oct 2003 Posts: 1,371 Costa Mesa, CA C chache876 pro stock
chache876 pro stock C Joined: Oct 2003 Posts: 1,371 Costa Mesa, CA	just so you know, LA style valve covers fit on magnum engines so its not a 'for sure' sign.

Re: LA or Magnum [Re: chache876] #509286 10/27/09 11:27 PM 10/27/09 11:27 PM
Joined: Jan 2003 Posts: 2,111 Bowie, MD R Reggie top fuel
Reggie top fuel R Joined: Jan 2003 Posts: 2,111 Bowie, MD	Quote: just so you know, LA style valve covers fit on magnum engines so its not a 'for sure' sign. Yep, and Magnum heads fit on LA blocks, so that ain't a 'for sure' sign either.

Re: LA or Magnum [Re: Reggie] #509287 10/28/09 12:06 AM 10/28/09 12:06 AM
Joined: Jan 2005 Posts: 12,424 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,424 Kalispell Mt.	The easiest way to tell if the block is LA or magnum is to look on the back of the block right below the pass. side head and see if there is a mounting spot for a crank sensor. The crank sensor bolts directly to the block via two bolts going straight up and down to the crank. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: LA or Magnum [Re: HotRodDave] #509288 10/28/09 12:27 AM 10/28/09 12:27 AM
Joined: Jan 2003 Posts: 9,826 las vegas 70AARcuda master
70AARcuda master Joined: Jan 2003 Posts: 9,826 las vegas	Quote: The easiest way to tell if the block is LA or magnum is to look on the back of the block right below the pass. side head and see if there is a mounting spot for a crank sensor. The crank sensor bolts directly to the block via two bolts going straight up and down to the crank. i got two 1989 360s that are LA engines that have the mount for the crank sensor on them...so..... i would go with the valve covers and look at the intake bolts...vertical for magnums Tony 70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)

Re: LA or Magnum [Re: 70AARcuda] #509289 10/28/09 08:20 AM 10/28/09 08:20 AM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger master
540challenger master 5 Joined: Apr 2007 Posts: 2,826 NY usa	Quote: Quote: The easiest way to tell if the block is LA or magnum is to look on the back of the block right below the pass. side head and see if there is a mounting spot for a crank sensor. The crank sensor bolts directly to the block via two bolts going straight up and down to the crank. i got two 1989 360s that are LA engines that have the mount for the crank sensor on them...so..... i would go with the valve covers and look at the intake bolts...vertical for magnums Magnums also have different motor mount provisons They have the LA "Ear" type Plus the newer style which bolt directly into the block. The LA only has the ear type

Re: LA or Magnum [Re: 540challenger] #509290 10/28/09 07:30 PM 10/28/09 07:30 PM
Joined: Jan 2005 Posts: 12,424 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,424 Kalispell Mt.	Quote: Quote: Quote: The easiest way to tell if the block is LA or magnum is to look on the back of the block right below the pass. side head and see if there is a mounting spot for a crank sensor. The crank sensor bolts directly to the block via two bolts going straight up and down to the crank. i got two 1989 360s that are LA engines that have the mount for the crank sensor on them...so..... i would go with the valve covers and look at the intake bolts...vertical for magnums Magnums also have different motor mount provisons They have the LA "Ear" type Plus the newer style which bolt directly into the block. The LA only has the ear type I have a 91 318 and a 91 360 and neither has the crank sensor mounts. Also they both have the magnum style mounts so How bout this for a gaurantee you can or can not run LA heads, the oil hole in the deck for the pushrods has to be there or you can not just bolt on LA heads, some early magnum blocks had the holes but they were completly gone i a couple years and were magnum only. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: LA or Magnum [Re: HotRodDave] #509291 10/29/09 11:38 AM 10/29/09 11:38 AM
Joined: Feb 2007 Posts: 231 Cumberland County, NJ coronetkid OP enthusiast
coronetkid OP enthusiast Joined: Feb 2007 Posts: 231 Cumberland County, NJ	well it's a running 318 in my 87 w100. it has the 5 hole valve covers....sooo. lol i dunno was just curious what i had. i have only owned this truck for about 3 weeks. and it is suppose to have a 360 in it but it swapped at some point. i will try to find the casting numbers today. thanks

Re: LA or Magnum [Re: coronetkid] #509292 10/30/09 12:59 AM 10/30/09 12:59 AM
Joined: Jan 2005 Posts: 12,424 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,424 Kalispell Mt.	I just double checked my 91 360 and it does not have the magnum mount holes or the crank sensor mount. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: LA or Magnum [Re: HotRodDave] #509293 10/30/09 08:04 AM 10/30/09 08:04 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	mags are 92-93 91 is a pre-mag roller cam block,it would not have the mag mounts,IIRC and my 1990 per-mag oiled the old LA style thru the block,heads,shafts,rockers AND had oil thru lifters with hollow push rods though.. geared up for mag heads in 92

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