2.02 heads on a 318

[jrlegacy23]

I have heard that you can not put 2.02 heads on a 318, is this true, or can you bore it .030 over and fit them on? I am looking to Aluminum heads on a 318 stroked out to 349 cu in. Is this possible or should I just go ith a 360 bored .030 over with some eddy heads?

 

[middleagecrisis]

I have heard that you can not put 2.02 heads on a 318, is this true, or can you bore it .030 over and fit them on? I am looking to Aluminum heads on a 318 stroked out to 349 cu in. Is this possible or should I just go ith a 360 bored .030 over with some eddy heads?

They will fit on a standard bore, whether or not they would provide a benefit depends on the application. Some people notch the cylinder bore to aid in air flow, which is what you might have heard, but it is not necessary.

 

[whitey]

I don't know how true it is, but I've heard the big valves on a 318 will cost you low end power. Maybe somebody could add to this.

 

[dgc333]

The chambers in the 340/360 head are larger than the chambers in a 318 head. So when you put a 340/360 head with 2.02 valves on a 318 you loose compression and low end power. Also the 340/360 head has bigger ports so when used on a 318 the intake velocity is lower which also impacts low end power.

The easiest, most straight forward and least expensive thing to do is build a 360 vs stroking a 318. Even if you already have the 318 and need to purchase a 360 block it will still be less expensive.

 

[BJR Racing]

You could go and read the Bowl Blending artical further down on the page and this will help explain the use of larger and smaller valves a bit better and why they aren't needed on small engines, if you need to know more IM me and I'll explain in detail so you won't get it wrong.

 

[GoodysGotaCuda]

im running 2.02 J-heads milled .050 (9.7:1 cr - 56cc chambers) on my .030 318 with a .480 lift cam revved up to about 6,000rpm and they haven't met the cylinder walls.

I've heard they can cost a little on the low end, but with my 3.91s and 3,800flash rpm dynamic converter, i don't think i've come to see a soggy bottom end

 

[jrlegacy23]

I think that I am going to stick with running the stock 318 and then put a 4" stroker crank in the 1971 360 that I have sitting in the garage. I also have one J head off from the 360 if anyone is interested. I only have 1, the other one accidently got junked (went to the crushers in the back of a VW) when my Dad was cleaning out his garage. I should have kept the head with the engine. Just PM me if interested in the one I have.