As has been said if they feel to hot then just drill two holes for each slot. There is NO WAY IN HELL you need to pull them off the boat to have them machined. All you should need would be like two 1/8" holes in each slot. But again there is NO WAY I would do that untell I tested it first to see. You are much better off with out those holes there if it will work with out them.

Jon

Jon, the risers came with the slots already in place. Then I took one of the risers to the machine shop for them to use as a pattern to mill out the spacers, not knowing that the manifolds had no water jackets. Your suggestion about drilling as a last resort is exactly what I'm going to do. Eddie Marine said the water jacket "area" was only about one quarter to three eights of an inch under the solid part of the flange and I have some high priced special metal drill bits that would do the job. I figured on three holes per flange. I just want to make sure I don't end up restricting the water flow too much. I'd actually thought about that if I end up drilling holes, which I really prefer not to, I might run the hose as well and make sure I've got plenty of "flowage" but then again maybe I'd have to much. Here I go again over analyzing. Time to call Billy Crystal again.

As far as sounding "worse than you" I take that as a compliment of the highest order.

Besides once in a while someone has to take some of the heat off of you and Fred.

Russ, I'm not sure, but I think Johno has an infared heat gun.

I saw the infared thermos at Home Depot or Sears ....seems like 34.95 ...cheap ..

I have no clue what an infared heat gun is. Have never seen one. Guess it tells the temperature of something huh???? Duhhhhhh!!!!!!!!!

Can't believe it's going to rain all day tomorrow. Pisses me off.

uses infared light ...point it at object ..."spacer" and it tells you what the surface temp is ....Alot of AC guys use em ...

http://www.techinstrument.com/Infrar...tersindex.html

you know you got me thinking about mine now ....

Outlaw you only need probably like 2 small holes btwn each stud on the manifolds if in fact you do have to much heat build up. All you are trying to do it to get a little water flowing through there. You DEFINATLY STILL NEED THE HOSE attached from the manifold to the riser or your water preasure will be off the charts. You will not lower the water preasure by having to many holes and what not so don't worry about that.

As for how to know about the heat then I would just use the old hand test. Put your hand on the manifolt, riser, and the spacer that you made. If there is not a large difference in temp then I would say you are fine.

Jon

I kinda agree with Jon ...I was thinking water passages as large as the risers ..when you were talking machining them .... but 1/8" holes ...just to flow some water ...makes sense ...how could this adversly affect the entire system ? If the water dumps in the riser close enough to backflow to the spacers anyway makes sense to have some flow thru them rather than just sitting there getting hotter. But .....testing as is not a huge deal either ..