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Re: Cylinder Heads for 318 4x4 [Re: Texas Backroader] #2770248
05/01/20 08:03 PM
05/01/20 08:03 PM
Joined: Oct 2011
Posts: 559
Idaho
L
LaRoy Engines Offline
mopar
LaRoy Engines  Offline
mopar
L

Joined: Oct 2011
Posts: 559
Idaho
Originally Posted by Texas Backroader
Originally Posted by Dave_J
Your stock 318 should run on Regular grade gas, these mods will require Preumumn grade so ANY MPG gain will be eaten up buy the extra $0.40 per gallon costs.

All these mods to a 0.030 over 318 will put out just a bit more power than a stock 5.9 Magnum with a good tune. But do a few bolt ons to that 5.9 Mag and now you really gain power for your heavy truck. Stroke is the win here for a heavy vehicle.


So, I didn't really consider the octane issue. What compression level do y'all think I would start needing to use the higher oct? Does hardened valve seats allow the compression to go higher (like on the 302)? I do prefer to burn low octane, not just for price, but because the ethanol is so bad for the fuel systems. I have replaced the 2bl carb 3 times since I got the truck in 09. And that is with a can of B12 poured into the tank ever other month. I hate ethanol, I'm literally writing a thesis on why I do for a class right now.

I'm kinda up in the air between doing 302/8 heads on my 318 or dropping a 5.9 like y'all said. I could keep my 318 for a light Duster or something someday later. After pricing 5.9s on FB marketplace, there's like 3 of them within 200 miles from me for 400 bucks. Would my fuel economy go down with the bigger Magnum? If I hopped it up a little, or decided to put a carb on a Magnum, would I run into the same octane/detonation problem?

I really appreciate y'all's input. You have saved me from putting together a motor for the wrong application.


Application? I've seen nothing at all indicating the truck's application. For what purpose are you going to use this 3/4 ton 4x4?

Re: Cylinder Heads for 318 4x4 [Re: LaRoy Engines] #2770250
05/01/20 08:25 PM
05/01/20 08:25 PM
Joined: Apr 2020
Posts: 11
Texas
Texas Backroader Offline OP
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Texas Backroader  Offline OP
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Texas
For application I was referring to not building a high flow sport motor for a heavy 4x4.

That being said, it is my only vehicle, so daily driver. Eventually it will become more of a toy though. I want to paint it up, (it's a stepside) and try to make it pretty. I want to put 33 or 34 inch tires on it and a mild lift kit (2 or 3 inch) without losing power from where it is at now. I'd like to break the 300 horse barrier really so that I can say I did. I've been wanting to do that for 10 years now. My application is daily driver/chick getter I reckon.


81 Dodge W250 stepside with a 318 and 4 on the floor.
Re: Cylinder Heads for 318 4x4 [Re: Texas Backroader] #2770279
05/01/20 10:16 PM
05/01/20 10:16 PM
Joined: Aug 2005
Posts: 5,998
Salem
Grizzly Offline
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Salem
Originally Posted by Texas Backroader
[quote=Dave_J] I could keep my 318 for a light Duster or something someday later. After pricing 5.9s on FB marketplace, there's like 3 of them within 200 miles from me for 400 bucks. Would my fuel economy go down with the bigger Magnum? If I hopped it up a little, or decided to put a carb on a Magnum, would I run into the same octane/detonation problem?

I really appreciate y'all's input. You have saved me from putting together a motor for the wrong application.


Oh, you're welcome, glad I could help! up

In a 5600 pound 4x4 QuadCab I'm getting around 17mpg with my 360 Magnum at 60mph and no wind. I'm turning 285/70/17's which is the same as a 33 inch (and they are heavy, and yes, they suck the power out of it) with factory 4.10's and 46re overdrive. The only tricks I've done is electric fan, no catalytic convertor (huge difference) and true dual exhaust. The 360 lasts forever too, mine has 313,000 miles and hasn't been touched.

If that's your First Gen in your signature you are referring to, you should get 1 to 2mpg better than Me. You are just about a thousand pounds lighter.

With all the money you save from aluminum heads, stroker cranks, intake manifold, headers, 4bbl carb suggested above (about $3500.00, great job as usual on the Truck advising, Idiots tonguue), you will have money left over for a NV3500 transmission.

I did have another thought after I posted my original response: from time to time I see complete V10's with transmissions for around $1500.00. It's something for you to consider, because they are a heck of an engine, make torque for days, and last a lot of miles. My Family has owned a V10 and I can't say enough good things about them. Have money set aside for speeding tickets. grin Fuel mileage-wise they are decent on the highway (15 to 16mpg) but are heavy in town and winter driving.

IMG_20171015_150138.jpg

Mo' Farts

Moderated by "tbagger".
Re: Cylinder Heads for 318 4x4 [Re: Grizzly] #2770296
05/01/20 10:48 PM
05/01/20 10:48 PM
Joined: Apr 2020
Posts: 11
Texas
Texas Backroader Offline OP
member
Texas Backroader  Offline OP
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Wow 313,000!!! Mine just ticked over 100,000 and using about a quart every 750 1,000 miles. Besides that though, it has been pretty reliable. And yes, that First Gen is my babe

43375525385_a3660f6659_c (2).jpg
Last edited by Texas Backroader; 05/01/20 10:51 PM.

81 Dodge W250 stepside with a 318 and 4 on the floor.
Re: Cylinder Heads for 318 4x4 [Re: Texas Backroader] #2770323
05/02/20 02:11 AM
05/02/20 02:11 AM
Joined: Jan 2003
Posts: 3,122
Auburn WA
Dave_J Offline
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Dave_J  Offline
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Joined: Jan 2003
Posts: 3,122
Auburn WA
Originally Posted by Grizzly
Oh, you're welcome, glad I could help! up

In a 5600 pound 4x4 QuadCab I'm getting around 17mpg with my 360 Magnum at 60mph and no wind. I'm turning 285/70/17's which is the same as a 33 inch (and they are heavy, and yes, they suck the power out of it) with factory 4.10's and 46re overdrive. The only tricks I've done is electric fan, no catalytic convertor (huge difference) and true dual exhaust. The 360 lasts forever too, mine has 313,000 miles and hasn't been touched.

If that's your First Gen in your signature you are referring to, you should get 1 to 2mpg better than Me. You are just about a thousand pounds lighter.

With all the money you save from aluminum heads, stroker cranks, intake manifold, headers, 4bbl carb suggested above (about $3500.00, great job as usual on the Truck advising, Idiots tonguue), you will have money left over for a NV3500 transmission.

I did have another thought after I posted my original response: from time to time I see complete V10's with transmissions for around $1500.00. It's something for you to consider, because they are a heck of an engine, make torque for days, and last a lot of miles. My Family has owned a V10 and I can't say enough good things about them. Have money set aside for speeding tickets. grin Fuel mileage-wise they are decent on the highway (15 to 16mpg) but are heavy in town and winter driving.


Somewhere I thought the OP was asking what was the best Aluminum heads to put on his daily driver Dodge 4X4 with a 4 speed.
Well, I guess this idiot (ME) gave some bad truck performance advice. Sorry. Disregard all I have said.

Just to refresh my mind I quote the OP:

Originally Posted by Texas Backroader
Hello everyone, I am planning out a 318 build. I am going around and around on the heads though. All I know, is that I want to find a set that use the LA style rocker shafts.

I have looked at the Edelbrock RPMs, but some threads seem to indicate that those aren't good for torque.

I have looked looked into the Promaxx heads. There just isn't much info out there because I think they are a new development. Do y'all know if these are reliable?

I've heard some good things about Sidewinders, but there does not seem to be much info out there for my application.

Trick-flow heads are a little pricey for what I want to do.

There is some good info on Mopar Commando W2 heads, but I have read that you need to spend about a grand at the shop to get them to perform well at all.

My favorite are currently the Indy LA-X heads. They seem affordable, and can be customized with varying levels of machine work straight from the factory. However, I think I saw somewhere that they need special 1 7/8 OD headers. Is this true? I prefer to spend less than $600.00 on headers. My truck is 4WD, so header choices are limited anyway.

My truck is heavy with the 4WD and long bed. It has the four speed manual tranny. I'm not sure what the rear end gear size is; but it rolls at about 3000 rpms at 75 MPH. Right now it has 31 inch tires (I might put 33s on it in the future) so torque is one of my big goals. Right now I am getting 11 mpg. If I could get close to 14 or better, I would be happy. Also, shooting for over 300 hp. 330 would make me happy and 350 would = really happy. That being said, streetable torque and at least 13 mpg are my top priorities.

So far I am looking to use my stock crank, KB 167 flat top pistons, Scat I beam rods, COMP Pro Magnum roller rockers, Summit 6901 camshaft and an Edelbrock Air Gap intake manifold. Any of those items could change, but so far my research (this is my first build) has shown that those components would equal a decent combination.

What do y'all think? What do you suggest on the cylinder heads for my application. I am pretty set on using my 318 block and an LA style rocker shaft style set of heads with a flat tappet cam. Besides that though, I am open to suggestions. Like I say, this is my first build, so I really don't know what I am doing. I appreciate any responses, feedback and criticisms in advance. Thank You!!!


Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: Cylinder Heads for 318 4x4 [Re: Dave_J] #2770326
05/02/20 03:00 AM
05/02/20 03:00 AM
Joined: Jan 2003
Posts: 3,122
Auburn WA
Dave_J Offline
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Dave_J  Offline
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Posts: 3,122
Auburn WA
Texas Backroader, what is your budget?

The 318 is a good platform to start with. Does it need rebuilding at 100,000 miles? This is where you have to ask your self, if it needs rebuilding and if it will need new pistons, the machine work is not cheap.

Many engine shops in Texas can make you a drop in crate motor that will be about the same as a rebuild but will maybe cost a bit more, but they do the work.

Getting a used Hemi or a V10 will also require you to rewire the truck with a computer control and all its sensors, fuel tank and fuel lines. You will not be able to use your 4 speed so get the trans that goes with this Hemi or V10. Your stock dash will not work with them so kobble up the dash too. You may get most of these items with a wrecked Dodge truck.
And making motor and transmission mounts to fit. Then the front suspension would need boosting for the weight of the V10.... Lots of work. But it will run real well.


Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: Cylinder Heads for 318 4x4 [Re: Dave_J] #2770351
05/02/20 09:01 AM
05/02/20 09:01 AM
Joined: Apr 2020
Posts: 11
Texas
Texas Backroader Offline OP
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Texas Backroader  Offline OP
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Texas
Originally Posted by Dave_J
Texas Backroader, what is your budget?

The 318 is a good platform to start with. Does it need rebuilding at 100,000 miles? This is where you have to ask your self, if it needs rebuilding and if it will need new pistons, the machine work is not cheap.
Many engine shops in Texas can make you a drop in crate motor that will be about the same as a rebuild but will maybe cost a bit more, but they do the work.

Getting a used Hemi or a V10 will also require you to rewire the truck with a computer control and all its sensors, fuel tank and fuel lines. You will not be able to use your 4 speed so get the trans that goes with this Hemi or V10. Your stock dash will not work with them so kobble up the dash too. You may get most of these items with a wrecked Dodge truck.
And making motor and transmission mounts to fit. Then the front suspension would need boosting for the weight of the V10.... Lots of work. But it will run real well.


I think it will need rebuilt. At a minimum, I'll probably freshen everything up (crank bearings, cam, pistons, gaskets, and it will likely need bored). I haven't priced machine work, (correct me if I'm wrong) I assume about 500-1,000. I always keep a millage book, and over the past 90,000 miles, it has dropped about a mpg. I used to get a 12.1ish per tank on a good day, with most tanks in the mid/low 11s. In the past 10,000, I have noticed a sharp drop. Now I make 11 on a good day.

For budget, I'd prefer not to exceed 4,000 and I won't exceed 5,500. I generally don't want to do a lot of pulling/reinstalling. So, I want to redo the bottom end all at once. I might purchase a block with heads/crank for no more than $400 and build it up so that my truck isn't out of commission very long. I am a little sentimental, so I was set on a 318 because it would be/look like the original. I'm just starting to consider a 360 Magnum lower end because it seems like it could be more financially feasible to gain some power and keep/gain torque for a heavy vehicle. Even if I do a Magnum though, I will probably buy a timing cover from Hughes to use my LA belt system and add a carb compatible intake to try and clone the hopped LA look. In the end, I might save money because I would inherit the Magnum heads. Plus, (correct me if i'm wrong) good roller magnum rockers are a little cheaper (370 for Crane) but the stock ones probably wouldn't need replaced. The cheapest good review roller rockers I found for my 318 (basically everything not Speedmaster) were over 550. So + 400 for motor + 150 more for hydraulic roller lifters + 60 for the LA timing cover + 30 for the cam snout + 20 more for the Magnum Air Gap than the LA one - 550 for the rockers - 750/1250 (or more) for heads = about $1,000 savings in favor of the Magnum if I don't replace the rockers. Although, the Magnum heads could be cracked. So, some of that money would go to the machine shop. Decisions decisions

I like to work with my hands and have always wanted to build an engine, which is why I haven't really considered a crate engine. This is the last summer before I graduate, so I am kind of hoping I can have some fun building it with my dad before I commission. When which, I'll only have the time to tinker with it between deployments.

Thanks for the responses everyone!!!

Re: Cylinder Heads for 318 4x4 [Re: Dave_J] #2770354
05/02/20 09:14 AM
05/02/20 09:14 AM
Joined: May 2005
Posts: 1,961
Apollo, PA.
B1MAXX Offline
top fuel
B1MAXX  Offline
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Apollo, PA.
Iron heads are pingers when you really load them, when you have the truck floored only turning 1500-2000 with a heavy load climbing a hill . My 360 is 8.4 to 1 and needs 93 and will still ping under those extreme situations. Depends on how hard you are really going to pound them. A trip down the quarter is a walk in the park. Watch some truck pullin videos that's more akin to what we put our trucks through. One difference in truck pulling is those guys spin the tires, turning some rpms, ours are glued to the ground dragging rpms down.If the 318 is in sound condition, put a aluminum intake, 1850 holley, headers, and a good tune (timing and carb) and pound the ---out of it.


wanna go a little more small cam and fresh valve spring ( paying close attention pushrod length, when changing cams--which some times leads to adjustable valve train, or change to pushrod length). Next would be heads I want to say I have a set of 302's that I have spent a good amount of time with I would not use these cylinder heads on anything larger than a 318. Mine have 360 vales and some port work, go 240cfm but the port is so small that I think that at this point they are choked. If its in the budget aluminum heads would probably be good helping to prevent pining.

ultimately get a 360 block and plan a build...p.s. 4" cranks might not be much more $ but there is more to it than that. Especially compared to a crank polish and re-ring job.

Last edited by B1MAXX; 05/02/20 09:15 AM.
Re: Cylinder Heads for 318 4x4 [Re: B1MAXX] #2770376
05/02/20 10:13 AM
05/02/20 10:13 AM
Joined: Aug 2005
Posts: 5,998
Salem
Grizzly Offline
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Turbo V10 First Gen, 653 lb/ft torque:



Mo' Farts

Moderated by "tbagger".
Re: Cylinder Heads for 318 4x4 [Re: Texas Backroader] #2770394
05/02/20 10:52 AM
05/02/20 10:52 AM
Joined: Nov 2015
Posts: 873
Missouri
J
jwb123 Offline
super stock
jwb123  Offline
super stock
J

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Posts: 873
Missouri
The heads come with nice 5/16 stem swirl polished valve, I just deburred the rough edges were the seats were cut.

Re: Cylinder Heads for 318 4x4 [Re: jwb123] #2770459
05/02/20 02:44 PM
05/02/20 02:44 PM
Joined: Jan 2003
Posts: 3,122
Auburn WA
Dave_J Offline
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Auburn WA
I know all too well the Deployment and personal life being put on hold. I did 20 years all active and all over the world.

I added up all the costs of doing an engine for my 78 Little Red Express. After adding all the parts and then the machine work including balancing it was just a little bit more to go with an ATK short block crate 5.9 4 inch cast iron stroker 410ci from SummitRacing. $2550.
With good heads, a large cam and better intake this engine is good for 600 HP. I am no where near that level..... for now. It is internal balabced so it will work on a 318 flywheel but I am not sure if the bolt pattern is the same.

I have a set of stock 5.2 iron heads that I was going to do a pocket port and then have the seats cut for some 2.02/1.62 better valves but Mancini was having a sale on some 'Overstock' Eldabrock alumimn heads for a Magnum and the costs were less than a full reman of the iron heads when I added new springs, valves, retainers and bronze guides.. This was a super deal but they are out of stock now. For two heads it was $1400 with shipping.

Dodge Dakota shortie stainless headers. $225 My LRT has dual exhaust STACKS so just re-piping to join them is simple. Adding an X pipe crossover to replace the factory H pipe.

Many companies make Magnum roller cams with the longer snout for the fuel pump eccentic, I went with a Luniti that for a 410 cube is a mild grind. $210

I went with a deep sump oil pan from Milodon for $329. It is 10.75 inches deep and holds 8 quarts of oil but I will only run 6 quarts and cut the dipsticks tube down so it shows full. This will help keep oil from splashing on the crank. But for a lot less, Kevko has a better rear sump truck pan, like $265 and their special oil pump pickup tube for that pan is $59. To save money a stock 360 truck pan works on a Magnum.

I spent a lot more for some upgrades and such so I am over the $5,500 range by about $1,200. But it will make about 420+ Horsepower and 500 footpounds torque.

My D150 based 2wd LRT is a lot lighter than your W200 4X4. It is still an 'Aero Brickwall'. I'll be running a 3.21:1 Suregrip and 265/70 15 tires so my RPMs will be a bit lower but with a Auto 727 and a 2800 stall lock-up trans and 500 Ft/Lbs torque it may be fun.

There are non-Magnum stroker 410 kits out there too.

This is a Web picture but mine will look about the same.

16869625-1978-dodge-little-red-express-std.jpg
Last edited by Dave_J; 05/02/20 03:05 PM.

Retired, US ARMY 1973-1994
ASE mechanic, Electrical 1994-1997
Retired GTE/VERIZON/FRONTIER 1997-2015


Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.

03 Suzuki Burgman 650(Burger King) Scooter
65 Formula S Cuda
78 Little Red Express Truck
98 Buick Regal (wifes car)
Re: Cylinder Heads for 318 4x4 [Re: Texas Backroader] #2770492
05/02/20 04:29 PM
05/02/20 04:29 PM
Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick Offline
master
HemiRick  Offline
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Posts: 4,848
Memphis
A used stock magnum 5.9 for $400 is what I would be looking for....they are common.


Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
Re: Cylinder Heads for 318 4x4 [Re: HemiRick] #2774614
05/14/20 06:23 PM
05/14/20 06:23 PM
Joined: Apr 2020
Posts: 11
Texas
Texas Backroader Offline OP
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Texas Backroader  Offline OP
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Posts: 11
Texas
Very COOL truck Dave_J.

So, if I'm trying to avoid detonation, would aluminum be better than stock magnum heads? Or, is it about the same as long as the heads have closed chambers? I have done some more research and read some threads that say tight quench lowers chance of detonation. Does quench just work on lighter vehicles, or could quench work on a heavier vehicle like mine as well. Also, do y'all know/have any experience with Huges's cams? I'm thinking about calling them for a cam.

Thanks for the responses


81 Dodge W250 stepside with a 318 and 4 on the floor.
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