I'd change the oil and check again. Did't you mention that you were running in the 11's AFR. Might just be diluted oil.

Hey Rookie, I missed your post about oil and weight. I am running the semi synthetic Brad Penn 10w30. Oil pressure has always been great. If it's diluted would it still hold good pressure? Lol!!! Could you really tell if 10w30 is diluted!! It's held the same pressure all season. I do plan on changing the oil while it's in my shop. I did change the dyno oil which was the same stuff but since then have put another 40 hrs on it. I think next year I will change every 20 hours. I have the one side tore down already and didn't notice anything wrong. There was a couple exhaust bolts that weren't that tight but no signs of a leak. Plug wires are new and look good. Plugs are coated with soot. The 02 sensor is coated with soot. There is soot on the transom. The carbs are way out of wack. During the dyno runs they were in the 13's and 14's so I asked him to richen it up. Maybe I should have left the stock jets in there? I believe that with my wet exhaust it naturally will richen up. Part of the reason the plugs look so coated maybe because the last run I made was from my house to the ramp at 1000 rpm. About a mile. Maybe they still run fine at speed and just the idle is crap? The 02 sensors gave up the ghost a while ago. They had an error code that indicated a bad sensor so I tried removing them and recalibrating but they never came back. One had a different error code after that but now both are stuck in the "HTR" mode which is heating up. This happened right after I installed the new tips. I thought maybe some water got to them. Maybe they are just smothered/plugged and can't read? I have attached some pics of the plugs and 02 sensor. Also just an overall pick of the rockers etc. I did notice that the rockers are not really centered on the valve tip (left to right) on the ones where the valve is closed. If the valve is open it looks pretty good. Is this something with the head/valve design or could this be straightened out? My engine guy said he'd come out and take a look. I'm already in this deep so I think I'll have him redo the valve adjustment again on this engine and then I guess come back after I get it together (and new 02 sensors) and work on getting the carbs dialed in. Thanks to everyone who took the time to look and post ideas. I'm not sure at this point how pissed I'm going to be if it's actually just diluted oil. Thanks again.



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A better shot of #1???

Are there guide plates on those heads, cant really see

Yes. I can take more specific pics if it helps. I just didn't know if this is typical of the BBC or not.

Last pic, roller is way off center on the valve. How many more are like that??

Your plugs look terrible, your tune is definately too rich SOMEWHERE.
how far are your 02 sensors from water? ICL/LSA/ .050 duration of cam?
your rocker arms are poorly lined up, you clearly have adjustable guide plates, use them to align your rockers properly and relash the valves.
Comp cams hydraulic roller lifters are cheaply made, pretty sure there imported . I would cycle them out at some point before 100 hours for good Johnsons before they fail and destroy your engine as they are worse then Morels which have a terrible track history these days. And thats assuming you just have one out of adjustment at this point and not one failing already. Good luck with it

The cam is a comp marine extreme 230/[email protected] with 112 degree lsa. Eddie Marine puts the 02 sensor in the riser just above where the riser attaches to the manifold. The riser runs almost to the transom. I cant get them further from water than what i have with my standard bravo setup. Several of the rockers are off center. I think that was the worst one. Are those lifters available at Summit or can i buy from you? As much as i wanted to touch 80 mph this year, I would much rather end this season without a grenade going off. Thanks for the help and heads up.

Hydraulic roller lifters are a sore subject for a lot of people these days. It probably has one collapsed although you need to start with getting the guide plates adjusted correctly and setting the valve lash again. I wouldn't even want to suggest what brand to use as all of them seem to have issues in the last 5 years or so. If it were mine, I would probably put in some solid lifters and tight lash them.

Not much point to those adjustable guide plates.

These were CompCams best lifter with billet blah blah blah..
The needle bearing and schrapnel thru the entire engine was cool.