318 build up...

Now this is weird but... a friend contacted me and said he knew a guy that had some Magnum, "302", and 340/360 heads. He sells them for pretty cheap from what I gather so... why not buy a set of 302 and 340/360 heads? Port them out and get the 340/360 heads milled down and strap a set of each on and see what works the best. Or am I totally crazy again? How much would it cost to get the 340/360 heads milled down anyways? Ok well I will save you all from my crazy ideas haha. Thank you!

Well you listed three heads there. all have pros and cons about them. Magnums, pretty darn good all around head. However, you will need new rockers, pushrods, lifters, valve covers, and a different intake manifold (unless you drill the heads to accept a LA intake). 302s, will bolt on and go. I'd recommend getting 1.88 valves put in, good valve job and maybe a little port work. 340/360 heads have either 1.88 or 2.02s. 2.02s are a little much for a 318, but I actually run them and my car still runs good for being what it is. The cores were given to me from a local mopar member and were setup for 2.02s, so thats what i went with. You will also need to mill down the heads to keep your compression ratio up. If you have the $$, magnums are pretty good heads, then the 302s or 360 heads. Depends on if the 340/360 heads are just smog heads, X's, or J's.....

mopar_nocar said
IF you are building a 318 to use on the street, use the -302s. i've used them on 318s & 360s and they make great power up to about 5000rpms and loads of torque. if you are going to race only, then use the 360 heads but get a BIG OL stall convertor 'cuz it'll be a slug off the line otherwise.

i've even used ported -675s on my 318s and been happy...snuck a set onto a 360 and it ran just fine for street use.

sb

Not necessarily...It depends on your whole combo. I run J-heads with 9.7:1 compression ratio. I do have low gears that of course helps for the possible soggy end with my 2.02 valves. With only getting 2,500stall it will still smoke my 275's from a dead stop onto second gear. But i am going to a 3,800rpm flash converter for a little more fun :toothy7: