Cylinder head/intake venting
#41
Registered
![](https://www.offshoreonly.com/forums/images/icons/prop.gif)
Thread Starter
![Default](/forums/images/icons/icon1.gif)
ThisIsLivin, Sounds like you've put your time into that beast for sure. I will drill the thermostats I have. Im assuming the 3 dimples that are already there. Your CD-1 sounds nice, wish I had known about that as an option when I was looking. My 6M-3L does have start retard, or is it start, retard.. lol.. I have it set for a 10* retard at start up. Then the springs & limit bushings in the distributor are set for all in at around 2700 if I remember correctly with a 34* max timing. We did 36* on the dyno but that was on VP110 I think.
On the exhaust, your talking about the drains where the cooling water enters the exhaust stream by design of the headers? Ive seen a bunch of different designs. my current tails have only 3 drain holes as you can see by my pic. I guess I was thinking you meant something else you were tapping into the tails yourself.
Anyway, I wish I could have cam'd up more & squeak out some more ponies but with the wet exhaust, according to the cam wizards, im at max duration now. 611/636 is still far better than the 385's they were at. who knows, maybe some day Ill change my mind & decide to be "obnoxious" & go dry. lol I still have I believe .0245 piston to valve clearance left.![Wink](/forums/images/smilies/wink.gif)
![](https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1124/20200514_120127_55a280fc157706c6b724ee66d2e86ed8c1f50fee.jpg)
drilling these 3 dimples
![](https://cimg2.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1124/20200514_120112_098f339310e237ccb460cd2c5aa9a19936b88677.jpg)
![](https://cimg6.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1124/20200514_120232_469b2af06827e61477129f922adc8f21dd8ec7f1.jpg)
Water drains into exhaust stream![](https://cimg8.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/1500x2000/32533_9776e1b074a6467b45b9dacaea89c5531dcf0e93.jpeg)
Room to grow
On the exhaust, your talking about the drains where the cooling water enters the exhaust stream by design of the headers? Ive seen a bunch of different designs. my current tails have only 3 drain holes as you can see by my pic. I guess I was thinking you meant something else you were tapping into the tails yourself.
Anyway, I wish I could have cam'd up more & squeak out some more ponies but with the wet exhaust, according to the cam wizards, im at max duration now. 611/636 is still far better than the 385's they were at. who knows, maybe some day Ill change my mind & decide to be "obnoxious" & go dry. lol I still have I believe .0245 piston to valve clearance left.
![Wink](/forums/images/smilies/wink.gif)
![](https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1124/20200514_120127_55a280fc157706c6b724ee66d2e86ed8c1f50fee.jpg)
drilling these 3 dimples
![](https://cimg2.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1124/20200514_120112_098f339310e237ccb460cd2c5aa9a19936b88677.jpg)
![](https://cimg6.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1124/20200514_120232_469b2af06827e61477129f922adc8f21dd8ec7f1.jpg)
Water drains into exhaust stream
![](https://cimg8.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/1500x2000/32533_9776e1b074a6467b45b9dacaea89c5531dcf0e93.jpeg)
Room to grow