Engine and Transmission Tech

Chad, About all that would be left would be the port flanges. I was planning on cutting the top off and making a box type manifold with interchangeable tops like I show a few threads back.It would work as a large plenum.Mostly I wanted the front water outlet so I would'nt have such long radiator hoses like in this picture.By the way this motor is in a 4X4 Trooper with 454 TBI with 350 injecters .It has the Delta cam also.I haven't had a chance to even look at mine yet.





Edited 3 time(s). Last edit at 01/27/2010 06:49PM by mgb260.

I'm pressure washing and tearing down the 4.9 this morning. Bore spacing measurements soon. I did find one aftermarket part for this engine:Cloyes double roller timing set for $56.

Hmmm, sure "looks" like sbc. pattern on cam spocket. Gear drive/belt drive anyone??

Took a little longer to strip down than I figured but here are pictures so far:







Edited 1 time(s). Last edit at 01/28/2010 06:11PM by mgb260.

Man, I just "dig" the way those head bolts tie-in deep in the block..into main bulk-heads perhaps? We want LS heads onnit!roverman

Jim, You may want to "peep", Alan Johnson's biz, Cadillac Hot Rod Fabricators in Fallbrook, C.A. He's big in Northstars, don't know bout 4.9's. roverman.

Jim, You may want to "peep", Alan Johnson's biz, Cadillac Hot Rod Fabricators in Fallbrook, C.A. He's big in Northstars, don't know bout 4.9's. roverman.

4.9 is uncharted territory. So far the Fiero guys are into them. I think it has potential for sports cars,street rods,sandrails,a replacement for V6's in Camaro/Firebird,S-10/S15 pickups and Blazers,Isuzu Troopers/Amigos and Jeeps also. I haven't had time to tear into mine yet with working on my days off, rebuilding my daughter's computer,etc. I did some comparison measurements with the small block Ford. About the same height,a couple inches wider, about 4" shorter. Transverse FWD motors are usually shorter.The good news is it is about 100 lbs lighter.



Edited 2 time(s). Last edit at 02/11/2010 02:59PM by mgb260.

Super Bowl today, maybe tommorow I can pull the heads. Here is 3 more pictures: 1 of homemade headers and Allante gear reduction starter, 1 of valve cover with fins ground off-do outside and be careful the 4.5 and 4.9 are magnesium and 1 of washer method to hold sleeves in on engine stand so they won't fall out when rotated.






Edited 1 time(s). Last edit at 02/07/2010 05:02PM by mgb260.

One more pic of head with 1.94 /1.50 Chevy valves. You can see why the engine is so short. The combustion chamber is turned sideways but looks a lot like Vortec heads.Rockers remind me of newer Ford.




Edited 2 time(s). Last edit at 02/08/2010 09:54AM by mgb260.

Jim, maybe a Mopar 5.7/6.2 gasket will fit ? What if ? roverman.

Art, I might go to my friendly neighborhood auto parts store and do some gasket comparing:Chevy LS and newer Mopar Hemi! I'm usually not that lucky though.



Edited 1 time(s). Last edit at 02/07/2010 10:01PM by mgb260.

Good news is...only need once ! YOU could be the "Pete Aardema" of the 4.9L. A Hemmy Cad-Sweeeet ! roverman.

Tomorrow morning I will finally have some time to tear down and get bore spacing measurements.

Bore spacing by tape measure: 4 3/8"(4.375) probably 4.4 like Chevy.Head bolt pattern 3.5" up and down 4.5" left and right.Skinny heads, probably have to live with stock heads: porting,polishing,gasket matching,larger unshrouded valves.



Edited 2 time(s). Last edit at 02/11/2010 08:46PM by mgb260.

One more thing for RWD, you have to make a remote oil filter adapter block to replace the stock one. Here is a pic showing the stock one hanging over bellhousing:




Edited 1 time(s). Last edit at 02/14/2010 04:21PM by mgb260.

Roller lifter and spider pic.

I got an engine manual from Ebay. It has all the info from 4.1-4.5-4.9 FWD/RWD and updates._Do not remove_ the lifter section.It is installed before the machineing operations on the block and machine torqued in place. So if you remove it the block will distort and be junk.(now I know why it says Do Not Remove on it) Looks like The Eldorado rear sump pan has a deeper sump than the standard RWD pan. 91 and up 4.9 had Gerotor oil pump.The intake bolts have conical washers and need to be torqued to 8ftlb then 12ftlb in sequence.The rocker arm bridges can be loosened gradually and the whole assembly lifts out, kind of like shaft mount rockers.Lots more info.



Edited 2 time(s). Last edit at 02/15/2010 09:28PM by mgb260.

Ok, so what did you see when you removed it ? Why would block distort ,unless lifter section was used to pre-stress block ? Got calipers ? Got LS and Hemi potential ? Can you hear the "build", begging for better heads ? roverman.

I didn't remove it. That DO NOT REMOVE kinda scared me. The cam bearings are in a 2 piece sandwich between the block and lifter part. The cam bearings are line bored,mains line bored, block bored AFTER the lifter piece is machine torqued on! Yes,pre-stressed. No way you could get it back exactly. Head bolt pattern is too skinny for other heads, just have to improve the stock ones best I can. I plan on cutting guides down,machineing the bowls/trimming guides in there,gasket matching,Chevy 1.94/1.50 valves unshrouded,Z28 springs.Homemade steel rocker bridge.1.73 Ford rockers or 1.7 big block Chevy adjustable with 2.8/3.1 Crane studs.Homemade headers. Delta cams hottest regrind(E303) cam.(this same grind in 302 Ford produced 400HP with 1.7 rockers and Edelbrock Performer intake)I'll have 346 c.i. or 5.7 Liter. 3.9 LS pistons for tractor sleeves. Summit or Holley 4 barrel on 1.5" adapter. 1/4" steel block girdle. 400 HP?



Edited 4 time(s). Last edit at 02/17/2010 12:19AM by mgb260.