Critque my 360 build

[74 DART SWINGER]

Hi guys Im getting ready to put a 360 togather for my dart to replace the mild 318 thats in there now. Heres my 360 plan so far..
-360 +.030, 9.0 compression
- MP .508 valvetrain
- Eddy perf intake/600cfm carb(on 318 now)
- stock 360 plugged smog heads with mild porting/polishing
Ill have a 904,stock 360 Torque conv and 2.76 for now. When summer hits ill change the gearing to 3.55 .
What do you think of this build? I want it to be daily drivable but decently quick.
Thanks!

[dwc43]

The 292* .508" is big for street use and you don't have enough compression to use it either. I'd go with a dual pattern cam in the 272 278 range. More exhuast duration and/or lift will help the heads flow better and make more power.

[MrChemist]

Without changing the majority of your combo, I would say get a smaller cam. I have run that cam in my car in Denver for many years (check my sig for combo). You just don’t have enough converter, gears, manifold, heads, and carb to make it run well. You will kill the bottom end torque and make the car sluggish around town…on a positive note; the idle sure will sound NICE. The 509 MP cam will make good power from about 3500-6500 RPM.

I’ll have to get back to you with a better cam choice. Will the motor be in your swing

[mopar_nocar]

less is more on the street when it comes to cams. i am a big fan of short duration, decent lift (stock valvetrain) cams for the street.

an example of cam that would be pretty good for your car is the stock 340 cam from 1968 - 1973 PN 2899206

lift .430 Intake
.444 Exh

adv. duration 268*Int/276*Exh

this cam will idle well and give good streetable power. it is available from a number of sources.

a little hotter cam is the 340 manual tranny cam pn 2899205

lift .444 intake
.453 exhaust

adv duration 276*intake/284*exhaust

it'll still be a little doggy either way until you get your 3.55s. then it'll be fun.

i'm not sure if those part numbers are still available from Mopar, but i found the first cam on ebag a few weeks ago for $59, and its going into a 318 build i am doing.

edit: did a little research, the current mopar performance part number for that cam with lifters is P4452782


sb

[74 DART SWINGER]

Ok i guess ill skip on that cam,i knew it wouldnt be fun in town lol. My friend does have a crane cams 0.470 .284 duration,if that would be more streetable and have more torque then the MP 0.508 cam.
And yes MrChemist,this will be replacing my 318 thats in my swingers now. Hopefully Ill beable to drive it to bandimere and see how she performs.

[rumblefish360]

For a cam and 3.55's in a 9.0-1 engine, I myself would not bother with a duration over 280 advertised or 230 @ .050. More lift the merry.

[TK]

Fun in town, depends oh how high stall of a converter you have, and how big your cooler is. The cam is too big, yes, but would "sound" pretty nice, and still make power, less on the bottom than the other cams mentioned, but it isn't like it wont run.

[rumblefish360]

I have used in the past with nice results a Crane.
Mello but with good power abiltys.

272/284 advertised (216/228 @ .050 )with .454/.480 lift on a 112 centerline.
The cam makes great torque and decent HP with or without stock heads and mild compresion.

You could still go a step larger if you wanted.

[dodger1]

I have a 4452759 (221/228, .430/.450, close to the-2782) in my 360/ 9.0:1/999/2.94 axle in my Mirada. Stock 78 heads and lifters, TQ/iron manifold,el cheapo headers. Very driveable, about 800 rpm (rumpity) idle. I would say anything between that and mopar-nocar's choice would work for you, except I don't know the effect of high altitude on your setup. Logic says: less air-less fuel-less HP. so.....more air (cam) - more fuel (carb) more power. Might want to go with neighbor mr.chemist there.

[MrChemist]

I think you would do well with the Comp Cams XE268H, 224/230 with .477/.480…this is about as large as you want to go with your stock converter. Going to the 3.55 gears will be a HUGE help as well

[dave571]

Originally Posted by 74 DART SWINGER

Hi guys Im getting ready to put a 360 togather for my dart to replace the mild 318 thats in there now. Heres my 360 plan so far..
-360 +.030, 9.0 compression
- MP .508 valvetrain
- Eddy perf intake/600cfm carb(on 318 now)
- stock 360 plugged smog heads with mild porting/polishing
Ill have a 904,stock 360 Torque conv and 2.76 for now. When summer hits ill change the gearing to 3.55 .
What do you think of this build? I want it to be daily drivable but decently quick.
Thanks!

It's too much cam , even with 3.55's

A good converter would help. Something in the 3500 range, which becomes an issue on the street, as far as cooling etc..

Realistically, the better choice is a smaller cam, as suggested.

IIt would run. but be a pig to drive. Even at the track, it would 60 ft very poorly.

It will be quicker with a smaller cam.

The rest of it is decent.

[345Dart]

As your compression may be even less than 9.0:1 at 5000ft less cam to match compression would be better.
Comp have a new updated version of the 340hp cam 222/226@.050, .464/464 lift and thats what I just put in a 340 for a good street runner.
It will work well with your combo too.