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  #1  
Old 05-31-2005, 02:54 AM
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Default 318 with 360 heads

Ok I just read what some where saying about 318 with 360 heads that you lose bottom end do to the the larger cc. Here's my question and I'll try not to be confusing. I want to build a 318 with around 400hp and desent tq, it will be in a w150 with a np 435. What would be a good combo to go with? I was thinking about doing a .030 or a .040 over a stroker 4" crank and hughes engines cam with 215/223 @.050. What kind of port work should I get done to the 360 head? Should I stick with the 318 heads? Is the cam I choose to large I want drivabilty and smoke my friends el camino!
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Old 05-31-2005, 03:11 AM
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Biggrin

at 390 something cubes, the 318 heads are too small.
915 are a good 360 head
cam sounds great for the cubes too
tell us how it runs, i want to build one!

oh yeah, port match, some minor bowl work and 2.02 valves would be awsome!
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  #3  
Old 05-31-2005, 08:43 AM
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Car Craft did an article on building a similar motor (318 with 360 Magnum heads) that dyno'd out to over 400 HP. I have a 318 that I was going to build like that, but decided not to in favor of building my 360 into a stroker instead. I do have a nice set of Magnum heads for sale if you want em. I am looking forward to finding out how your build turns out, good luck!
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Old 05-31-2005, 10:43 PM
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Biggrin

We did a 318 with 360 heads and 2.02 valves for a race car at well over 400 hp as well. Ran good too. Turned it about 6800 all night long.
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Old 06-01-2005, 01:19 AM
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it is a 318 with a 4" crank! not a 318. id keep away from magnums, they dont have rockershafts..................
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Old 06-01-2005, 01:21 AM
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I am hoping for 14 sec or under in a 4 wheel drive and a truck tranny, and stock gears I am not sure of what they are, but there only in the 3's so what ever a 9 1/4 came with in 1980 is what is has. I will love the look on the rice boys face when there turbo charged inter-cooled, nitro-injected gets beat by a beat up ol' truck! :flip:
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Old 06-01-2005, 01:25 AM
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http://www.moparchat.com/forums/showthread.php?t=90586
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Old 06-01-2005, 08:43 AM
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Quote:
Originally Posted by dodgetkboy78
it is a 318 with a 4" crank! not a 318. id keep away from magnums, they dont have rockershafts..................



What is wrong with the Magnum heads? They are not known for having issues, and are used on alot of high horsepower small blocks. They flow alot better than the older 360 heads because the intake runners have a more direct path to the chambers. Just because they dont have rocker safts doesnt make them bad heads.
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  #9  
Old 06-01-2005, 12:53 PM
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Does any one think it would be worth the money for a roller cam and roller rockers?
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  #10  
Old 06-01-2005, 12:57 PM
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Quote:
Originally Posted by Tuff360
Does any one think it would be worth the money for a roller cam and roller rockers?
oh yeah! but, i had about 1600 in my mech roller valvetrain, and that was 8 years ogo.
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  #11  
Old 06-01-2005, 05:20 PM
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This doesn't have much to do with small block business, but I have a friend with a '74 D100 that is beat to shit, has an ugly aluminum topper and a shotgun patterned acrossed the hood and on the fender. It was an ex city truck and it now has a 500+ cube wedge RB with aluminum Indy heads and a 294 Hughes cam.

He picks on all of the 5-nothing stangs and ricers who like nitrous. The truck runs an 11.7 on pump gas and looks like an abandoned vehicle.

I like your idea!
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  #12  
Old 06-01-2005, 05:53 PM
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Quote:
id keep away from magnums, they dont have rockershafts
A moot point. The rocker shaft set up is better hands down but doesn't really shine until you put the screws to it.
The Magnum shaft mount rockers will hold big power and don't ever thick otherwise.
The shaft mount system is best and KING!. Thats why Chevy guys pat Jesel big bucks for the conversion kit when the get into serious racing.

Tuff360; If you have the coin to justify the expense of a roller cam and valve train, GOD bless ya and do it. Pound for pound, spec vs. spec, the roller is better.
But, I did say the word expense didn't I.

The thing here is you can have great power with a Hyd. no brainer cam or better power and light mant. with a mech. cam with a few extra RPM.
AND still have some coin in the pocket.
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  #13  
Old 06-01-2005, 09:29 PM
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I dont think I could stand solid lifters. One of my lifters now sounds like a solid its annoying, especialy with its somewhat quite at start up then tick tick tick I just want it to shut up! Sitting at the drive thru speaker and got to shut it down so they can hear me, clack clack clack it almost sounds like a diesel now if it only made that power
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  #14  
Old 06-01-2005, 10:08 PM
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Think solids are bad? Take a Cummins to the drive-thru. I built a full roller 340 and at first, I was appalled at the noise. Talk about paranoid! It just takes a while to get used to it.

torch
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  #15  
Old 06-01-2005, 10:22 PM
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Use a 360 block 4 inch crank and balanced internally, you will be way ahead of the game. The 318 block will be giving up 30-40 cubes either way. The hole purpose of stroking it. If I didnt have a set of heads, I would buy a new set. Buy the time a set of X or J heads are purchased, porter and reconditioned for a high power enigne a better "new" head can be had. The 400+ cubes will have a hard time making optimum power with a 318 head. The magnum head would be a better head choice for various reasons, they have a much better exhuast runner design. Nothing wrong with the rocker setup. Intakes are readily available.. If I built a stroker small block, I would be looking for alot more that 400 horses.
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Old 06-01-2005, 11:39 PM
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Unless you got a good reason to stay with the 318 (and YOU get to decide what constitutes a good reason, our opinions don't count) I agree with rellik as far as a horsepower start point. After that, all you need to remember is this: "Horsepower costs money; how fast do you want to go?"
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  #17  
Old 06-02-2005, 02:57 AM
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I understand horsepower cost money. BUT why take and externaly balanced 360 and turn it into an internally balanced when I already have a 318 internally balanced? Everyone build a 360 or a bigblock. Why be the same when we drive mopars to be different. The 318 is a good motor, and I am looking for the small bore to larger stroke ratio. I live high in the mountains ok not to high but my avg elevation is 6000 so it kind of hard to get an engine to breath right. 400 hp in a pick-up that WILL haul things beside hauling ass, 400 is enuff for me. I will get the BIG HP numbers when I build a 69 charger with a 440 stroked to a 500 and twin turbos paint it like the general lee yeah good time good times!!!!!
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  #18  
Old 06-02-2005, 07:27 AM
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Biggrin

I don't drive Mopars to be different I drive them to win. 400 hp is cheaper and easier to make in a 360 and it will last longer and be easier to drive on the street. Compared to a simular built 318. And the 360 is still a small bore with a longer rod ratio that makes more torque than your 318 ever will.
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Old 06-02-2005, 09:50 AM
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Then does any one have a spare 360 lying around? I sold mine to my friend. I had a 89 360 block w/ roller cam and sold it for 75 bucks. I wonder if he's willing to sell it back.
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  #20  
Old 06-02-2005, 01:21 PM
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Quote:
Originally Posted by Tuff360
I understand horsepower cost money. BUT why take and externaly balanced 360 and turn it into an internally balanced when I already have a 318 internally balanced? Everyone build a 360 or a bigblock. Why be the same when we drive mopars to be different. The 318 is a good motor, and I am looking for the small bore to larger stroke ratio. I live high in the mountains ok not to high but my avg elevation is 6000 so it kind of hard to get an engine to breath right. 400 hp in a pick-up that WILL haul things beside hauling ass, 400 is enuff for me. I will get the BIG HP numbers when I build a 69 charger with a 440 stroked to a 500 and twin turbos paint it like the general lee yeah good time good times!!!!!
ATTA BOY!
dont listen to these guy's, they let cubic inchs blind them, you want a 318, build a 318. teh 318's seem to last longer (oh boy, here it comes) in HEAVY DUTY WORK, im not talking mild street strip motors, im talkin truck pullin motors, ones that are in motorhomes and trucks that cruise 3300+ rpm and run flat to the floor for a hell of a lot longer than 15 or 20 seconds. (yesterday, i held my 318 to the floor for at least 3 minutes pulling a bobcat)
the smaller main bearings dont get as hot and burn the oil, and the smaller bore is more eficcient. (dwc runs a 500cfm 2bbl on his sportsman, one of these days, im gonna club him over the head, build a 318 and stuff it in there, and he will be amazed how much more power a 318 can make with resricted resourses like a 500 cfm carb)
my 1 ton ran 14.93 in the quarter with a 318 with a slap in manifold carb and cam, I had a duster, that would run mid 11's with a 318 (it was a fire breathing, solid roller, x headed one) and had the power to get into the 10's with traction (the motor stil runs, i took the roller crap out and ran it 100,000 miles in a truck, now it is in my race truck)
a 318 can be built just as mean, so, if you want to build a 318? build a 318. dont let these guys talk you into a 360 or a big block.
(i am starting to collect parts for my next 1 ton motor, a mech flat tappet, ported 675 headed, forged piston 318) AND IT WILL ROCK!
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  #21  
Old 06-02-2005, 10:50 PM
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Quote:
Originally Posted by Tuff360
Then does any one have a spare 360 lying around? I sold mine to my friend. I had a 89 360 block w/ roller cam and sold it for 75 bucks. I wonder if he's willing to sell it back.
I got one, but shippin would be a killer.
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  #22  
Old 06-03-2005, 12:12 AM
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Just put it in a lot of foam and bubble wrap and send it air mail with a VERY large catapult. I'll get a few friends with blankets to catch it. lol
I can find 360s around here but they must think there made of gold or something.
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  #23  
Old 06-03-2005, 07:23 AM
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Quote:
Originally Posted by Tuff360
Just put it in a lot of foam and bubble wrap and send it air mail with a VERY large catapult. I'll get a few friends with blankets to catch it. lol
I can find 360s around here but they must think there made of gold or something.

I know exactly what you mean. I finally found one around northeastern Oklahoma and I am paying $250 and driving 2 hours one way for what may turn out to be a core. Wish me luck on it being in decent rebuildable shape. By the way, I have been looking for over two years. The least expensive I have found before this was $450.
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Old 06-03-2005, 10:26 AM
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Man - o- man there raping you all. I get the full engine out of a Magnum truck for $300. Running
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Old 06-03-2005, 11:26 AM
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Quote:
Originally Posted by rumblefish360
Man - o- man there raping you all. I get the full engine out of a Magnum truck for $300. Running
Well send them this way! I found one a couple of years ago for 450 or some where in that price range it wasn't even complete I still needed an alt and a computer,a few other things to make it run. One guy about 3 years ago GAVE me GAVE ME a roller cam 360 and what do I do sell it for 75 dollars because I didn't want to move it again.
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Old 06-03-2005, 03:47 PM
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Well, I just got back and tore the 360 down on the top end. I finally found a good one! 1972 engine with standard bore and the crosshatching is still visible. 915 heads with 1.88 valves.

Anybody know the compression ratio on a 1972 2 barrel 360? And also maybe the head gasket thickness? Looks like maybe a .020 steel gasket.

I am thinking about just sticking on a set of magnum heads with a mild cam (Comp XE262) and Weiand Stealth and using it for a street motor if the compression won't be too low.
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