318 with 360 heads and compcam build help
Alright here is how my story goes I have a 67 318 with 318 heads and a spare set of 360 heads practically stripped to nothing all I know I need is valves to put these on pictures below are of the cam kit I have in a box for the car and the cam spec sheet. Looking for advice I’m keeping the stock crank and connecting rods other than that it’s free game. Ignore the pushrods didn’t know enough when I bought that about a year ago. I’m thinking I can use the original pushrods and rocker assembly on the 318 heads but I’m not sure I don’t have a spec sheet for something like this.
View attachment 1716382459
These are the 360 heads with nothing on them
View attachment 1716382461
This is the 318 heads I have with everything on them.
Intake. Exhaust.
| VALVE ADJUSTMENT | HYD | HYD |
| GROSS VALVE LIFT | • 497 | . 483 |
| DURATION @ | | |
| - 006 TAPPET LIFT | 287 | 304 |
VALVE TIMING
.006 | Open | CLOSE |
INT: 40.0 | BTDC | 67.0
ARDC - |
| EXH :80.0 | BBDC | 45.0
ATDC |
| THESE SPECS ARE FOR CAM installed | | |
| @ 102.0 INTAKE CENTER LINE | | |
| INTAKE | EXHAUST |
| DURATION @ . 050 | 235 | 249 |
| LOBE LIFT | • 3310 | • 3220 |
| LOBE SEPARATION | 107.0 | |
Don’t know what this chart really means. But this is what I bought a while back on marketplace.
Looking for help on what to buy to build the block I can answer your questions If you can help me choose what to do to make some power.
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Hah!
If this gets big-port factory heads,
This should be good ............ in a bad way.
I have done this for both mysely, my friends and for others who paid me to do it, even after I told them, it was a bad idea, and NOT ONCE did it turn out well.
Nine to one is NOT enough CompressionRatio for a 235*/287 advertised cam, even if it is on a 107Lsa, to produce adequate cylinder pressure at anything but WOT, and after the cam wakes up.
Now, IDK about you, but how often do you imagine that you will be at WOT and 3700 >5400? compared to, at well below 3000?
I'm not gonna tell you that this is a terrible idea, cuz every time I do, the worms come out and tell me how wrong I am.
So instead,
I'll tell you that every time I did it, it was a disaster; and the reason was always the same, because, the cylinder pressure was so low as to be laughable, making take off about as exciting as a wheezing slanty. Every one of those cars needed a higher stall and "race-gears", to be fun.
The only good thing to come out of those builds, was that I then had a couple of sets of "hi-compression" 318 heads, that on a 340 were dynomite for a streeter; even with tiny stalls and hiway gears.
For that lazy as heck 235* cam, in a 318, you really need an Scr close to 10.5, to wake up the bottom end. You can put your money in the pistons or in the convertor Plus gears. Your choice.
Pressure will get you better fuel economy, Convertor and gears, will go the other way.