gunracer1

well i have been pushing my luck for a long time and it finally fell through. it has seen 40 plus boost and 16 to 20 degrees timing for the last 60k plus miles. it dynoed 468 rwhp 3 or 4 months ago with 48 psi with the hx55 and 20 degrees of timing. and was all but smoke free. so i decided to all some more fuel and get it rolling hard. so i did some work on my afc sunday and made the fuel come on faster and harder. well it ran like a scalded dog, built boost much sooner and smoked like a freight train. so i figured i would just put in the valet and leave it alone.
i jumped in it this morning and went to the store and left it running, when i came out it was leaking pretty good. so i went back home and took a good look at it and sure enough it was coming out between the #2 and #3 exhaust outlets right at the base between the head and block.
i am pretty sure the extra fuel down low and 20 degrees of timing killed it. so it looks like it will get a set of studs and a 10 over marine gasket. hopefully a port and polish job also.

RowJ

No o-ring while your in there?

Sorry for your trouble....sounds like you got more than most out of the stock HG, though?

Good Luck

RJ

gunracer1

no i think i will just use the marine gasket and a set of arp studs. this is my daily driver and i really don't see me going nuts with it.

Jambbii

I picked up my marine gasket from cummins and it was cheaper than piers or anywhere else I looked. Have fun changing the gasket, my truck was too big to get a chear picker up there to lift the head off. What good times

SmokinFive9 4x4

funny story about that,,,when I did mine the first time, me and a friend about killed ourself trying to lift that thing by hand out of the truck, and then when we get it on the bench, he goes "Why didn't we just put the engine hoist on it?"

cummnz4x4pwr

Sorry gunracer didnt mean to jinx u the other mornin when i asked about ur head gasket, oh and im hoping to go up ur way this next wknd, fingers crossed.


Jake

gunracer1

it was all my doing, i added a good bit more fuel saturday and now i have to pay for it.

pwrtripls1

You have a 468 rwhp diesel daily driver and dont want to go nuts with it? I hope I can say that one day. Sorry to get off topic and ask, but is your truck easy to drive still like stock exept when you hammer it? I want to make simular power but dont want it to drive to far from stock.

gunracer1

it is a lag pig with the hx 55 with the 19cm exhaust. it was much more fun to drive at 450 rwhp with a hx35 with a 14cm exhaust housing, but the egts were through the roof. i will more than likly just put a small set of twins on it for daily driving. but the big end is crazy with the hx 55, i had 375 rwhp at 146 mph last dyno day. on the interstate it is crazy fron a 75 mph punch. but it did seem to pick up almost a mile to the gallon with the big turbo over the hx35, and i have towed 10k with no real problems. but i could tow at 30k gross with the hx35 with no big problems.

RowJ

PWRTRIP
I'm sure Gunracer1 will answer for First Gen Trucks...but I suspect the answer will be the same.
Opps...guess he types faster. (with typos - he did 475 hp last dyno...not 375...I was there).

IMHO, you can get to 500 hp with an automatic and maybe 550-600 on a manual tranny and still have absolutely normal street manors. Different...but very drivable on a daily basis, including towing.

Go to a set of small twins and each # probably goes up by 100 hp.

Haven't gotten much over 500 hp myself so don't know about how far you can go...after market mfg's seem to keep raising the bar. I've only been around Diesel web pages for 3 yrs and I can remember when 400 hp was VERY impressive!

RJ

Jetpilot

You should really O-ring your head while you have it apart. The cyclinder pressures at your HP level and timing will probably kill the HG again, even running a marine gasket and studs.

Doug

HOHN

Too late for that!!

gunracer1

i am holding back waiting for a half ton short bed reg cab dodge to come up cheap. then i will start digging out all the good stuff i have been rat holing for the past couple of years. i am shooting for 11s in the 1/4, and 30 mpg.

gunracer1

hey roland i was saying i had 375 rwhp at 4k rpms or so. i did 468 at 3k or so.

gunracer1

well i pulled the head off this weekend, this truck has had the pyro buried many, many times. heck it was at the 450 rwhp range with the stock hx35 with a 14cm ex housing on it. so i was worried about what i would see when i poped the head. guess what, it looks great, it even suprised me how well it looked. 20 degrees of timing with the 370s was barley out of the bowl on the spay pattern. the gasket failed right between the #1 and #2 exhaust. the gasket just ley go, the cylinders were still sealed up tight as a drum.