boring my 318

o sorry jw means jsut wondering and or what means like if not what not what im saying then when what do you me

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LOL, OK then. (It's brain twisting sometimes after the midnight tour.)

All 360 heads should be small valved @ 1.88. Theres some that say they also came with 2.02 intake valves, but I have never seen it myself. That doesn't mean it doesn't exisit.
On a 318, if you have 360 heads, and you want to use them, it'll ok to do. It is a good on the cheap upgrade. Ethier ported 302's (late 318 heads) or a Magnum head swap would be more powerful than 360 heads with any valve.

Again, on compresion, you'll need to surply some info. exact ratio depends on this. This question is basicly un answerable unless you have done it and/or measured the specs needed to know. You can ask this question 50 different ways, the answer is allways going to be the same.

In theroy, he he he, if the 318 is an 8.5-1 engine, with a head cc chamber of 65 cc's and you swap on a 360 head with 75 cc's, you drop the ratio from 8.5-1 down to 7.73-1. With this ratio, you now can use Yak urine to power the car.

In order to make the 360 heads work is a milling of the deck to get the number of cc's down to the 318 head or less. And then the heads start to make power close to what the stock heads do.

Actually, IMO, you would be better off stealing the 360 valves and installing them in the 318 head and doing a bowl porting and port window enlargement for better torque and HP. The skinnier port and general smaller sized port will have better velocity and keep the engine from getting a muddy bottom end.

The 360 head can make more power if built for it. But your hard pressed to make use of the larger head port and valve size on a 318.

What books did you get/have now?