SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: daymiene on July 20, 2017, 06:46:57 PM
-
So I bought a big block chevy recently And I was getting ready to put my intake on when I noticed something that definitely doesn't look right. The guy I got the motor from swears up and down these will work, but I'm in serious doubt. In the driver side head looking into the first water jacket on the front of the motor is very rusty. The rust ate out the jacket to the point where I can see the push rod?? Engine dude says they did a pressure test at 45 lbs and they worked. I just don't feel Comfortable at all putting this together HOPING it will work.
Also there's some type of plugs in the ports that they slopped silicone or something over. I added pics of both. Please help guys! I was hoping to get the boat running this weekend but this stopped me dead in my tracks.
Sent from my iPhone using SoCal Jet Boats mobile app (http://r.tapatalk.com/byo?rid=201)
-
It looks to me like what you are looking at through the water passage is a new exhaust guide installed and not a push rod.
Bostick(R) was telling me about why it is a challenge to install new guides in factory iron heads and what is actually a cool feature of a BBC. The guides are actually directly water cooled as in the water comes in direct contact with the guide. The guide isn't just pressed into a hole drilled in the cast iron.
I have never actually seen before digging out my heads to look and see what is in your picture. Mine isn't shiny new like, but there it is. If you look at where the push rods are, you will see it can't be a push rod.
The silicon glob, on the other hand, my guess is that those are covering four (two per head) additional head bolts installed after the fact. You should see the same thing in cylinders 2, 3, 6, and 7. I think the block has not been drilled and tapped for the four (two per head) additional head bolts. It is my understanding that if these bolts are not used, the holes should be plugged.
My opinion, I would not want that glob coming loose and passing through my new engine. Might not hurt it, but it's sure not going to help it.
I have never had heads machined for the additional four bolts and not installed the bolts. The four additional head bolts should be 3/8-16 button head or socket head cap screws. There might be pipe plugs installed in the top of the ports for access to torquing them.
I don't know what to tell you about this without opening a can of worms. I'm going to suggest asking the engine builder about the globs, what's under them, and if he has no concerns about them (warranty wise).
Good luck,
Joe
-
That glob looks like it might be epoxy.
Sent from my SCH-I535 using SoCal Jet Boats mobile app (http://r.tapatalk.com/byo?rid=201)
-
I took those globs of whatever off and there are in fact 2 plugs in each port in cylinders 2, 3, 6, and 7, I believe. The only thing Is there is no way to tighten or loosen them. They have either a little symbol on top or a number or letter or something. No Way to tighten or loosen. Could I put something over them to be sure they don't back out? Talking to my mechanic he said one of his buddies had the same set up as me with the plugs and one backed out and obviously ruined the engine. My biggest question is can I run these heads?
Sent from my iPhone using SoCal Jet Boats
-
I haven't checked on top of the ports yet but I will be sure to do that tomorrow as soon as I'm off work. I would assume you access the ones on the bottom of the port from the bottom side of the cylinder head?
Sent from my iPhone using SoCal Jet Boats
-
There is nothing to put a wrench on? Could be possible that pipe plugs were installed from the head gasket side (deck).
I'm thinking run 'em.
Sent from my SCH-I535 using SoCal Jet Boats mobile app (http://r.tapatalk.com/byo?rid=201)
-
That's what I was thinking too. Well I guess the situation isn't so bad. I just wanted to assure I wouldn't get any water in my engine. I have it apart at the moment and now would be the best time to take care of any of these issues. On those plugs I was thinking maybe a little jb weld around the little bit of thread I can get to from the inside of the ports? Or bad idea? I'm just afraid of one of those things coming out
Sent from my iPhone using SoCal Jet Boats