The Magnum 380 crate motor head is a swirl port design that has smaller combustion chambers and a higher compression ratio (nominal 9.0:1). Different intake and exhaust port sizing flows more air without modifications to the cylinder heads. Breathing is enhanced with 1.925" intake valves and 1.625" exhaust valves. Overall package of smaller valves and better ports flow more air. Next, we slide in our .501" / .513" lift, 288/292 degree duration hydraulic roller camshaft, add a 4BBL carbureted M1® single plane intake manifold (with bosses over each runner for future MPI). We add special valve springs and a double roller timing chain as well as an MPP electronic distributor. The distinctive Mopar cast valve covers with 10 screws are added to the package, with an oil pan (center sump) similar to the Commando engines. It is recommended you add your own 750 cfm Holley carburetor and headers to complete the package. Dyno testing with a 750 cfm carburetor and 17/8" headers show horsepower output to be 380+ at 5300 RPM. Torque output is 410+ lb/ft at 4400 RPM, with over 350 lb/ft available from 2000 to 5700 RPM.
I think the original sale prices were around $3500.
Summit/Jegs sells them for $10K. Ridiculous if you as ask me
Thanks
So where do they sell them now or are they obsolete.
Not interested in the $10,000 engine. Lol
That part no. is just for a short block, but here are the Specs right out of the Mopar Catalogue.
Part Number*P4876906
Block Magnum 360
Deck Height 9.580"
Crankshaft 3.58 Cast
Rods Forged
Length6.123"
Pistons Hypereutectic
Coated Skirt
Comp Height1.58"
Bore Size 4.020"
Rings 5/64"
Camshaft Hydraulic Roller
Timing Chain Double-roller w/sprockets
Head Oiling Pushrod
Lift @ Valve 0.501"/0.513"
Duration 288/292
Fuel System Carb. w/Mech Fuel Pump
Thanks guys
I was asking as I found a used one for sale with 2500 miles on it for $3500
I think I read somewhere that the comp for them was 9.6
It's getting up a bit high I think as I wanted it around low 9s
I must admit it surprised me a bit. My smaller cam 360hp engine ran really well at idle with a small lope.
This engine is way way more lopey but supposedly only 20hp more power.
This is my cam. Smaller
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=661&sb=0
That's a nice grind,Maca.The bigger cam bleeds off cylinder pressures,off the higher compression setup. If It were me: ported E.Q. heads,find a medium cam .(220-224 @ .050"intake ,228-234@ .050" duration,on a 110-112 lobe seperation depending on gear/converter(?),& tire diameter. Too far off the combo you know,will cost you money,you don't need to spend.
Thanks Keith!
These are updated specs are for the later version with used block, note bore size 4.020"
Not to bring a thread back from the dead, but what did you use for valve springs in that motor?I'm confused. Do you have a Magnum based 360 already?
My observations/opinions: I've worked on a couple of cars with the Mopar 380hp crate. Cam too big, M1 single plane too big, compression too low (for the aforementioned) NO low speed/part throttle torque. Avoid if you don't have a light car w/deep gears.
I built this engine to emulate a 380 hp crate with a more torque oriented goal. 360 TrueStreet Magnum Build
Current owner but it in a 3400+lb Mirada and he cannot believe how fast on the street it is. He says it will take his fathers 2010 Challenger RT with a few mods and his brothers '69 RoadRunner 440/6 with cam and headers. Torque below the peak is what rules here. J.Rob
Not to bring a thread back from the dead, but what did you use for valve springs in that motor?
Stock retainers, or something else?I believe I used Manley 22410-16 in that one. J.Rob