I just acquired two sets of 360 heads. I intend to use one of the sets with my 318 for a mild street build. Both sets came off of late 70's vehicles. I haven't studied them in detail yet but one set is p/n 4343475-A, and the other set is p/n 4027596. I have heard some good things about the 596's but there seems to be a lot of over all confusion, (I can't find any solid information online) and even confusion about the existence of the 475's. The only noticeable things I see are the differences in the water jacket cooling ports, there are more of them and bigger. I really would like to know more about these mystery heads so I can figure out which set is the winner. Any Ideas?





Probable 318 Build:
bore 3.940
0 deck KB hyperutectic pistons
balanced rotating assembly with upgraded rod bolts
Comp 268H cam (full set) 218 @ .050
Stock 596 360 heads 9.3:1 CR
dual plane edelbrock or weiand intake
750 carb
1 5/8 headers

I ran simulations with this build and got a little over 330 Hp and 386 ft lbs tq. Who knows how accurate desktop dyno is though.
More costly bolt on mods later on would wake this build up a little more. Not quite 400 hp though.

 

7T -

Can't help ya with the headS. I used to run 340 HP heads on my 318.

Everything else sounds good, bUt the carb is most likely too big. (Just some quick calculations, you'd have to be pushing close to 10K rpm to need a 750.)

Archer

 

I just built a 318 with some 360 cast 308 heads and just like your 360 heads you will have a huge intake runner port mis-match. But because you are wanting a mild build they will work okay. I you wanted more compression and horsepower having some cast 302 close chambered heads would be the way to go.

 

Yeah it is probably is a bit to big. Desktop Dyno simulations were telling me to increase the cfm to lower manifold vacuum at higher rpm, but I wont likely be running up at 5000-6000 much if at all. Ran my last 318 with a Carter 650 and it ran fantastic. Right now I have a Holly 600 w/vac secondary I can use.

 

That looks like a nice build!

Agree, smaller carb unless you have the 750 for free and then you need to re work it some.

Do you know chamber size on the heads?

 

Don't know the chamber sizes yet. I flipped one of the 475's upside down then used a syringe to fill a chamber. It took about 70cc's to come level with the surface. I will take them to my machinist later on, but till I do curiosity has got the best of me.

 

that sounds correct to me. I think 72cc was factory give or take a cc..

I would look at XE262H cam too. It has 218/224 same lift and same lsa. Has a slighly more aggressive lobe. I dont know why they call it 262??? It brings the torque in a little earlier and the extra duration on the exhaust side can help the weaker exhaust flow.. I have used / currently use the XE lobes and they all bring the torque in sooner that their H cousins and lose nothing up top. They CAN be NOISY!

Just throwin it out.. 268H perfect too...

 

Good point on the exhaust flow. Planned on using the stock rockers and shafts can they be used with the XE cam?

 

on that 268 they recommend an after market stall converter, but otherwise the build looks awesome! 330 horse is about right; you'll definitely notice a difference when compared to stock!

 

You sure can. The XE series are cut for the .904 tappet size in the Mopars. I think it calls for the 901 spring.. Nothing crazy there. Most their other stuff is Chebby lobes we get stuck with. They still work great but not optimal. Mopar made a great design, might as well get what you paid for Yes the 268H could ( might not) need some stall, the XE262H wont with the full length header you spec'd.

You have a good mild build that you can improve on later if you wish. Add some EQ heads later to up the flow and WOW....

When you take your heads in to the machine shop add up the costs, if you need a mil job, seats, guides and some valves watch the price... EQ heads with light weight valves are about 300 each and they flow excellent in the .45 lift range.... 302s like Bremereric mentioned above are 185 with springs...

 

I found you some info. Go hear and read a little.

http://www.1962to1965mopar.ornocar.o...adarticle.html




http://www.ebay.com/itm/CHRYSLER-DOD...item27aa06a618

 

WOW, that's a really nice price on those heads. Wish they had oversized valving but that's still a nice deal, eh?

 

7T -

Looks like you're getting some good advice on the heads.

I'd start with the carb you have and see how it goes.

The other thing I don't think you mentioned was the ignition system.

If the engine came from/going into a 70's era vehicle, you probably have an electronic ignition already. You can use that for the time being and upgrade to the MOPAR HP system (Orange or Chrome box and dizzy) and good wires when your budget permits.

Archer

 

Those ebay 302's look an awful lot like my 475's except for the fact that the 302's have the closed chamber. Both appear to have extra cooling capacity. I tend to think a head like that would be an advantage.

 

That's exactly right. The larger chambers of the 360 heads are going to kill your compression ratio on a 318. If you don't think the stock 302 castings will give you quite enough flow you can put 360 valves in them and get the pockets (bowls?) cleaned up. If you decide to go with the 302's make sure you run an intake with 318 sized runners (like a Weiand Action Plus).

Good luck with your build. I love 318's.