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Re: 300hp magnum crate 360 convert to 380hp? [Re: Venomvpr900] #653957
03/30/10 01:26 PM
03/30/10 01:26 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
Not enough dumb comments...yet

Joined: Jan 2003
Posts: 24,562
Brookeville, Md
cam, intake and headers I think.


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Re: 300hp magnum crate 360 convert to 380hp? [Re: Venomvpr900] #653958
03/30/10 02:04 PM
03/30/10 02:04 PM
Joined: Jan 2003
Posts: 17,801
S.E. Michigan
ZIPPY Offline
I Live Here
ZIPPY  Offline
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S.E. Michigan
Quote:

Quote:


There is a new low cost 4" stroke, reman-style, magnum head MP crate engine hopefully coming online this summer. I'm not going to post the part number until it's been activated, however the directional MSRP is currently $5419 so that's a good sign. Given the pieces in it, it should run as hard (or better) than the older version.





That would be better then the $10,000 they have the 405hp 360 listed for. What a rip




The race block, aluminum heads, forged crank/rods/pistons, and race quality build/dyno facility (none of which are really "required" for a 405hp motor but that's debateable) drove the price way up there, there's no doubt about it.

Re: 300hp magnum crate 360 convert to 380hp? [Re: JeepJimmy] #653959
03/30/10 07:04 PM
03/30/10 07:04 PM
Joined: Jan 2003
Posts: 1,271
eastern long island,NY
JeepJimmy Offline OP
pro stock
JeepJimmy  Offline OP
pro stock

Joined: Jan 2003
Posts: 1,271
eastern long island,NY
i found a old 02 MP catalog. says both motors used the P5249464 valve springs. so i guess i dont have to change them??? now im confused


70 duster 360magnum, 1975 jeep j-10.
Re: 300hp magnum crate 360 convert to 380hp? [Re: JeepJimmy] #653960
03/30/10 11:39 PM
03/30/10 11:39 PM
Joined: Jan 2003
Posts: 17,801
S.E. Michigan
ZIPPY Offline
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S.E. Michigan
Though the older marketing says otherwise...in practice, I've seen and heard of them both ways. Sorry, just passing it along.

Though Mopar specified the parts and marketed the engine...the better springs were not really required for the 300 to run well, and Cummins was known to deviate from the bill of materials at times.

Pull one spring and pressure check it, compare to the recommended spring and go forward


Rich H.

Esse Quam Videri




Re: 300hp magnum crate 360 convert to 380hp? [Re: JeepJimmy] #653961
03/30/10 11:45 PM
03/30/10 11:45 PM
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Posts: 12,408
Kalispell Mt.
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HotRodDave Offline
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Kalispell Mt.
This just got me thinking and so I called up my friend with the crate motor that is supposed to be a 380 he said it does have the R/T heads so I informed him it is a 390 hp motor. Also he measured the pistons for me and they are .069 down and I measured a stock 5.9 here at my house and the pistons are .071 down and I can promise you the soapdish in my pistons are bigger than the 2 valve releifs in his pistons but he don't have a CC measureing device so I can not give you a number.

Also not that it matters to this discussion very much but the valve springs on his heads are cylinderical not behive.


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Re: 300hp magnum crate 360 convert to 380hp? [Re: HotRodDave] #653962
03/31/10 10:50 AM
03/31/10 10:50 AM
Joined: Sep 2009
Posts: 186
Kansas, USA
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Venomvpr900 Offline
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Kansas, USA
Heres the specs on mine?

Specifications:
• Thermocycled Block Is Bored to +0.020" Oversize
• New Magnum R/T Big Valve Cylinder Heads
• Mopar Cast Aluminum Valve Covers
• High-Strength Stainless Steel Valves — 2.02" Intake, 1.62" Exhaust
• Heavy-Duty Valve Springs
• Hydraulic Roller Camshaft — 288°/292° Advertised Duration (230°/234° Duration @ .050") 0.501"/0.513" Lift
• Pistons — 9.0:1 C.R.
• Single Plane, M1® 4-bbl Aluminum Intake Manifold
• (Includes Bosses for MPI Conversion; Taller than Stock — Check Hood Clearance)
• Double Roller Timing Chain and Sprocket
• Mopar Performance Electronic Ignition Kit with Distributor
• High Volume Oil Pump

I now know that "Thermocycled" is mopars marketing term for reman

I have no complaints with the product I received. It runs great and has every bit of 390 hp I do question how the new improved version with the race block, aluminum heads, 10:1 compression ratio, forged everything, and the tuning and dyno testing can only make 15hp more for $10,000 I would think I could take my other stock r/t block and build a 500+ horse small block


1987 D-100 SWB, 390hp/360ci Mopar Performance Crate, Built 998 trans, 9.25 axle with sure-grip and 3.92's - 3960#'s with driver 13.83 @ 96.36 1.98 60 ft 2003 Dodge Ram 2500 HD 5.7ltr HEMI!!!
Re: 300hp magnum crate 360 convert to 380hp? [Re: ZIPPY] #653963
03/31/10 12:27 PM
03/31/10 12:27 PM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
I Live Here
patrick  Offline
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Posts: 16,122
Grand Haven, MI
Quote:

Though the older marketing says otherwise...in practice, I've seen and heard of them both ways. Sorry, just passing it along.

Though Mopar specified the parts and marketed the engine...the better springs were not really required for the 300 to run well, and Cummins was known to deviate from the bill of materials at times.

Pull one spring and pressure check it, compare to the recommended spring and go forward




easier visual reference is the MP .525" springs the crates are supposed to have are 1.4" OD straight springs, the stock mag springs are behives with a ~1.1" OD retainer...


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: 300hp magnum crate 360 convert to 380hp? [Re: Venomvpr900] #653964
03/31/10 12:38 PM
03/31/10 12:38 PM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
I Live Here
patrick  Offline
I Live Here

Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
Quote:

Heres the specs on mine?

Specifications:
• Thermocycled Block Is Bored to +0.020" Oversize
• New Magnum R/T Big Valve Cylinder Heads
• Mopar Cast Aluminum Valve Covers
• High-Strength Stainless Steel Valves — 2.02" Intake, 1.62" Exhaust
• Heavy-Duty Valve Springs
• Hydraulic Roller Camshaft — 288°/292° Advertised Duration (230°/234° Duration @ .050") 0.501"/0.513" Lift
• Pistons — 9.0:1 C.R.
• Single Plane, M1® 4-bbl Aluminum Intake Manifold
• (Includes Bosses for MPI Conversion; Taller than Stock — Check Hood Clearance)
• Double Roller Timing Chain and Sprocket
• Mopar Performance Electronic Ignition Kit with Distributor
• High Volume Oil Pump

I now know that "Thermocycled" is mopars marketing term for reman

I have no complaints with the product I received. It runs great and has every bit of 390 hp I do question how the new improved version with the race block, aluminum heads, 10:1 compression ratio, forged everything, and the tuning and dyno testing can only make 15hp more for $10,000 I would think I could take my other stock r/t block and build a 500+ horse small block




simple, the MP aluminum mag heads shroud the valves really bad in stock config, flow about the same as untouched R/T's....no additional flow makes no additional power.

the additional point of compression should yield 3-4% more power, or 12-16 more HP on a 400 HP motor...


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
Re: 300hp magnum crate 360 convert to 380hp? [Re: patrick] #653965
03/31/10 01:03 PM
03/31/10 01:03 PM
Joined: Jan 2003
Posts: 17,801
S.E. Michigan
ZIPPY Offline
I Live Here
ZIPPY  Offline
I Live Here

Joined: Jan 2003
Posts: 17,801
S.E. Michigan
Quote:

Quote:

Heres the specs on mine?

Specifications:
• Thermocycled Block Is Bored to +0.020" Oversize
• New Magnum R/T Big Valve Cylinder Heads
• Mopar Cast Aluminum Valve Covers
• High-Strength Stainless Steel Valves — 2.02" Intake, 1.62" Exhaust
• Heavy-Duty Valve Springs
• Hydraulic Roller Camshaft — 288°/292° Advertised Duration (230°/234° Duration @ .050") 0.501"/0.513" Lift
• Pistons — 9.0:1 C.R.
• Single Plane, M1® 4-bbl Aluminum Intake Manifold
• (Includes Bosses for MPI Conversion; Taller than Stock — Check Hood Clearance)
• Double Roller Timing Chain and Sprocket
• Mopar Performance Electronic Ignition Kit with Distributor
• High Volume Oil Pump

I now know that "Thermocycled" is mopars marketing term for reman

I have no complaints with the product I received. It runs great and has every bit of 390 hp I do question how the new improved version with the race block, aluminum heads, 10:1 compression ratio, forged everything, and the tuning and dyno testing can only make 15hp more for $10,000 I would think I could take my other stock r/t block and build a 500+ horse small block




simple, the MP aluminum mag heads shroud the valves really bad in stock config, flow about the same as untouched R/T's....no additional flow makes no additional power.






That might be true if the newer crate engines used the older MP aluminum magnum heads in the old configuration, but unfortunately they don't. They now use an Edelbrock magnum head with a MP logo on it.

Unfortunately HP ratings are conservative marketing, not actual data.

An average 380 really made about 408, an average 390 really made about 410, and so on....I have no idea about the new one.....other than it should be better than it's rated at, given the E heads that are on it.

If you're very resourceful and very patient, you can make
7, 800HP or more for 10 grand. Small block crate engines aren't marketed towards the kind of person who would spend years waiting for good deals on parts, who would spend many hours massaging everything, etc.

Re: 300hp magnum crate 360 convert to 380hp? [Re: ZIPPY] #653966
04/01/10 08:05 AM
04/01/10 08:05 AM
Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
patrick Offline
I Live Here
patrick  Offline
I Live Here

Joined: Jan 2003
Posts: 16,122
Grand Haven, MI
I didn't realize they have moved to an eddy based heads vs. the small port commando based aluminum magnum heads....

yeah, that 405 horse is probably a real world 420-430 with eddie heads...


1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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