Are Tiger heads too soft for boost?
 

I have had terrible luck with nitrous and this tiger headed 537. The heads actually started to go concave at the center ports and I resurfaced them 3 times. This time we had to go .010 cut. I was using .060 cometics this last time and pulled 20* timing for only a 200 shot and still torched the block and head. I am selling all the nitrous stuff and putting on my F-2 Procharger, my question is, will these heads work with about 10-15 lbs. boost?

Steve

A guy in our nostalgia group has had a similar experience running NA only. Wonder if a good heat treat on the heads will help fix this issue.

It is a cooling problem between the center exhaust valves. Drill some holes, put a second water pump on and you will get 50 hits on the gaskets. That's around how many Rex gets.

I believe na they are a very good head. With power adders I have heard of some problems. What style combustion chamber are you using?

Where should I drill holes???? Should I just sell the heads and get something a little more durable??

Steve

I would and if you're going run nitrous get the chambers softened.

Nitrous is for sale and i won't be using it anymore. I am putting my Procharger on but before I do, I need to address this issue.

After drilling today, I notice that it is completely solid between the 2 center cylinders. I assume you drill completely through, parallel to the stud and exit out on top of the head.

Steve

I ran no water and methanol....normal exhaust temps and torched heads every couple passes... take what you want from that... I know sikgoat gave up on tigers and boost and went to eheads....

Big Chief had same experience

How's your guys experience with boosted engines ?

The heads need a Cryo temper session !

So does anybody want to buy a real good set of Tigers?

We ran 2 sets of early Tiger heads. Sprayed 600 HP nitrous on these combinations. Our only real issue was the lack of clamp load available on the two step studs that go between the intake ports. Ended up boring those holes for straight 1/2" studs and installing step washers. We used copper gaskets, O-rings, and a wet deck. These heads sealed better than the E-heads for us. FWIW.

How many runs did y'all get before gaskets replacement?

Maybe this could be a option for you? I have no personal experience with them.
http://forums.maxperformanceinc.com/...t=tiger+insert

Tiger Deck inserts
 

[QUOTE=p4msi1;5923779]I have had terrible luck with nitrous and this tiger headed 537. The heads actually started to go concave at the center ports and I resurfaced them 3 times. This time we had to go .010 cut. I was using .060 cometics this last time and pulled 20* timing for only a 200 shot and still torched the block and head. I am selling all the nitrous stuff and putting on my F-2 Procharger, my question is, will these heads work with about 10-15 lbs. boost?


Steve,

I have copper inserts that can be installed to fix your problem. I would like some feed back from some of you that are using them.

We have had good results with the new inserts. We have done 15 to 20 sets of heads and have not heard of any problems other than the ones mentioned below.

I did one set of heads that was running nitrous and went lean. The alum around and under the insert was melted away and almost all of the way thru to the other chamber. The inset looked like it did when it was installed. My customer wondered if the melted area could be welded up without removing the insert. My first thought was no, then I said, it held up to nitrous, maybe it would hold up to welding also. I don't know how or if it was repaired. I would be interested in hearing if the head is fixed and how it was done.

A second set of heads had a problem after several initial dyno pulls. I'm not sure yet what caused the issue, but I will let you know when I find out.

Thanks

Glenn Sedig

Cell 815 441 0931

Yup, considered this option also.

There is no clamping issue. There is no softness issue. There is a heat issue. Remove the heat, remove the problem. It's that simple. Using the insert by itself will not resolve the issue.

We were getting 25-30 runs on a set of copper gaskets. We were running the Flatout coated copper gaskets and the coating would eventually fret through and we would get some water seepage. Occasionally, we would lose the seal between the center cylinders because of the heat concentration with the two exhaust valves. We did not have that modification to the head in the middle that is supposed to cure this. For our match race type deal, this was about half a year for us.