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  #1  
Old 07-18-2001, 11:18 AM
splatt splatt is offline
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Question is 360/380 crate motor OK for street?

I recently bought a 73 Challenger with 360 SB, 904 Auto, power brakes. I plan to put in a shift kit in the 904 and around 3.5 rear gears. The existing motor is tired, so I am looking at a whole new motor.
Is the MP 360/380 crate motor a good choice for the street? I want a car that is fun to drive and can spank some Mustang/Camaros. I want horsepower but have good throttle response in normal driving. Will the cam/intake in the 360/380 be a little too much?
Anybody using the 360/380 crate motor in a street car and how do you like it.
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  #2  
Old 07-18-2001, 11:26 AM
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This motor is perect for the street. We have it is a 67 Dart. It has a lot of throttle responce. It will run 13.40's in street trim. Bolt on a set of slicks and open the headers-12.40's. As far as the gas millage. We have 4.56's out back and the car gets better millage than our Durango gets. So it wouldnt hurt for you to go to a 3.91. For the price you cant beat it.
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  #3  
Old 07-18-2001, 12:19 PM
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dilley340 dilley340 is offline
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DartMan360,

Did you open the motor up to check the torque specs and make sure it had assembly lube before the installation? I've heard alot of bad things about the MP crate motors, especially the RB's. The LA motors sound great. Price is right too.

I'd like to get your take on this.

Thanks,
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  #4  
Old 07-18-2001, 01:05 PM
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The motor was already in when we got the car. It was brand new with 62 miles on it. The car was ready to go racing with the 4.56's and the 904 was built with a reverse valve body. We got the car, and spare 904 with a stock converter, a 69 340 that is .30 over and runs,2 brand new intakes and valve covers, and boxes of peices and parts. All this for 3,500. All the car needed was paint. But what was on their wasnt bad. But we have the car painted this past winter. The guy said they just stuck it in their and fired it up. I have yet to hear any bad stories about the 360 crates. The Crate motors that they had the most problems with are the hemis. So far we havent had any trouble with the motor it self. 2 weeks after we got the car took it to Norwalk and first pass on the car the electriacal system burnt out. Got that fixed. Now we just the car back from the tranny shop after the tranny blew a month ago. Hopefully this is all that will happen this year. But so far everything but the motor has gave us problems.
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  #5  
Old 07-18-2001, 01:26 PM
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Man, you got a good deal!

What converter are you runnin' and how tall are the tires to go with the 4.56's? I'm also curious about the carb and headers.
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Old 07-18-2001, 01:56 PM
splatt splatt is offline
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DartMan360, are you running a manual or auto tranny?

If I run this 360/380 crate motor with my 904 auto, what stall speed convertor will I need? How would a 3000 RPM do?

Will there be any problems with vacuum for my power brakes?
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  #7  
Old 07-18-2001, 02:15 PM
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We have 26x10x15 for the slicks. We run about 11 lbs in them. The car hooks hard. The track that we regulary race at isnt prepaired to what it should be but were pulling 1.65 60'. We had the 904 completly rebuilt and just got it back Monday. Their was a 3000stall 11in TCI converter in their before. We got a custom Coan 10in. It should stall between 3500 and 3800. The carb is a holley 750 vac. secondary. It is all stock but has a #28 jet in the front with a purple spring. This is something that we are still playing around with. The headers are 1 5/8 headmans that we picked up from a swap meet for 40 bucks. They were a pain to put in and for the #1 tube to bolt in we had to cut the flange so it would flex. The tranny is a full manual reverse with a turbo action valve body.
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Old 07-18-2001, 02:32 PM
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Thanks for the input DartMan360! Sounds like you have a sweet combo for your Dart.

Don't break any more parts
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  #9  
Old 07-18-2001, 03:02 PM
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Hopefully nothing else will go wrong this year. If we sell the convertable the next thing is a super charger. This should give us anywhere between 800 to 900hp. We wont use it all just what the will take on 10in slicks. Hopefully it will get us deep into the 10's where we want to be.
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  #10  
Old 07-18-2001, 04:27 PM
dewme5 dewme5 is offline
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if you have 900 hp, and only 10's there should be a problem. and you are going to need about 20 psi of quailty boost (cold dense boost) to make that kind of power jump! oh yeah.. dont forget a cam swap. the 360/380 has 74 degrees of overlap. that is not good when you are running boost! because you are bleeding off HUGE amounts of pressure.!!! loosing mucho power.
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Old 07-18-2001, 07:58 PM
splatt splatt is offline
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OK, so DartMan360 is running a 360/380 create motor. Is anybody else using one in a street car and what is your opinion?
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  #12  
Old 07-18-2001, 08:42 PM
dewme5 dewme5 is offline
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yeah... im running one also. love the thing. mileage with fuel injection i got 24 mpg on the highway. power... its there.. dependability.. ive got over 30000 miles on it. and i love it! add the turbos.... even better.!
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  #13  
Old 07-18-2001, 11:17 PM
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Talked to the guys at KRC and they said the super charger they have will put out 480 hp. All of this at 5lbs of boost. Can get this bolt on kit for 3100 complete and have it on in 2 hours. The cam over lap wont matter coz we wont use all of the 900hp. Just what ever the car can take and if we can get it toghter. As far as the 10in slicks go. Just seen a guy tonight at the track running 9.80's on 26x11x15. Pulling 1.42 60's wheels up. All of this on a stock Duster frame with CE shocks and S/S springs clamped in the back. So we know it can be done. Most people think that 10in slicks wont take that much.
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  #14  
Old 07-19-2001, 05:00 PM
dewme5 dewme5 is offline
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i would double check.. that 480 hp, i would belive is the total output. not + the 380 that you are already making. consider that you are trying to jump your power over 100% considering that is going to take 2 times the air and gas. at least. (not to mention that is going to have to be air of the same temp. not heated up like any sort of blower is going to make happen. so... adding 14.7 pounds of boost, is doubling the total air in the engine. roughly... 14.7 (ambient air at sealevel) +14.7 (boost) + one heck of an air to water inter cooler setup (not available on a roots type system... to the math. 5pounds of heated up boost... that would make the 380 hp climp to 480 hp maybe. (maybe...!!!!) there is no way it is going to make it to 900hp! check the details on that kit. that is alot of money to throw away.

get either "maximum boost" by corky bell or "Turbochargers" by hugh macinnes. either book will help you make a better / more informed choice

Later.
T
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  #15  
Old 07-19-2001, 05:28 PM
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Talked to KRC again and asked them. They refered me to a guy that used their setup on a 340. He got 420 before and 900 after. The guy that has the gail banks turbo set up for small block chevy put it on a stock and tired 350 that was making around 300 and got 1000 hp. All of that from 10lbs of boost.
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  #16  
Old 07-19-2001, 08:14 PM
dewme5 dewme5 is offline
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i could be wrong... but from what i have read... the #'s just dont add up
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Old 07-19-2001, 10:20 PM
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lol. I thought this to. But after I talked to KRC on 4 differnt ocansions and then talked to the guy who has the same one on his 340 we are conviced. Even if we only get 200 or 300 hp. That will put us into the 10's. We are just looking for a 10sec small block street car that you can drive cross country if you want. I was their when they put that 350 on the dyno before and after the turbo. I couldnt belive it. If it was easy to make some manifolds for it we would prob do that.
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