Put my truck on a dyno over the Labor Day weeken, first time me or the truck have ever been on a dyno. I only got one run in before she blew the head gasket, pushed coolant passed the cap and on the dyno. Had a two hour drive home, stop multiple times to refill the rad with water and got the motor very hot… I saw 250 EOT at one point.
Truck is 97 f250, ext cab long bed, 4x4, zf5, rear end locked. 250/100, s364.5, comp springs, sb push rods, exotic head studs, adrenaline hpop, etc. was running jelibuilt tunes. And the motor has 220k miles.

On that one and only dyno run the truck made 480hp and 937tq.

Besides being disappointed about the head gasket, I was hoping to see 500hp and 1000tq.

I’m curious to what some of the people on here think of why I had a head gasket failure and how I can make more power next time. I obviously cheaped out on the head studs but didn’t think it would be a problem with this power level. I installed studs one at time…. I did not do a hot retorque. I plan to switch over all the go fast parts to a different motor with only 68k miles on it. I’m planning to spend the extra coin for arp studs this time… thoughts ?

 

 

Any idea on how much boost you were pushing?

 

not sure about the head gasket, but that color is worth 10hp

 

40-45psi of boost. Yes the color of the truck definitely adds hp lol calypso green Metallica

 

Xotic, is that an import brand? I only install ARP.

 

 

• WORRY-FREE PURCHASE - Xotic Performance is dedicated to offering LIFETIME WARRANTY and full money back guarantee if you aren’t satisfied. Rigorous quality inspections are undertaken to ensure premium product standards.

 

I believed the exotic studs are made in Canada. Not quite sure I blame them, who knows I could have cracked cylinder head for all I know. I can have a lot of compression in the coolant system. I installed them one by one with the motor out of the truck. Made sure to clean holes and use proper lube and torque. I won’t be using them agian definitely will be using arp

 

I bet they are made in China. If they were made in Canada they would be proud of that and include that on the label. Cheap go fast parts cost more money in the long run.

 

Very true could be. Yes but once and definitely the lesson here lol. Anyone think these numbers are low for this set up? I understand one dyno to the next could be different

 

I think that is on the low side of HP.

 

As you said, it may not be the studs. It will be interesting to see what you find during tear down.

I think the injectors can do more but once you get it back on the rollers you can see what it will put down for numbers. I think this will be a good test of the range of the 364.5. Which housing are you using?

 

I’m using a .91ar housing, she only got one run the dyno also, but the operator felt like he had a good run and wasn’t going to see much more power…..
I’m thinking of going alittle bigger when I put the truck back together.
I talked to rosewoods who I originally got the 250cc/100 from and asked if they could put a 200% nozzles on. He told me that’s not how it works and he would have to make body modifications and he wasn’t interested in doing……. I then call full force and he said he could put some 200% on rosewoods injectors and didn’t think they needed to modify any further to accommodate bigger nozzles.
Not sure who to believe lol

 

I wouldn't count out early timing as a culprit either.