CK5
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I haven't dynoed it and no headers. Quite frankly, unless they are Tri Y, headers lose too much low end

Found some papery the other day and did some math. The heads are 461x with 1.94 Stainless valves and seats with screw in studs. They've been milled so slightly under 63 cc results in about 10.1:1
Intake is a Zz4 aluminum high rise. These are supposed to be worth 10 HP & 15 lb/ft over a Performer RPM

Exhaust manifolds are ported

Cam is 440/425 220/212 @ .050 on 112/106

When I had the comp program and used these numbers, it said ~300 HP and 425 TQ through manifolds

I can tell you it runs real close to what the K5 did, and that engine was fresh

But does it do good burnouts?
 
I have a set of Tri-Y headers but haven't convinced myself to run them. Headers come with there set of headaches. That's why I was curious if you were sans-headers
 
Then you had Howell burn a chip based on what you have on the motor, correct?
 
Then you had Howell burn a chip based on what you have on the motor, correct?
Yes, I called and talked to Troy. Gave him all of the parameters for the engine, let him know which computer, trans. Had him delete out the emissions BS and remove the VSS.

Same guy burned the chip for the K5. Real pleased with the outcome both times.



As for headers, I might put a set of Doug Thorley tri y headers at some point. Those were the only ones I saw that produced more torque below 3k. Most headers do very little below 4-4500, and are less effective as atmospheric pressure drops. Re: they are worthless on SBC trucks in CO if the rest of the system works fairly well.
 
And I will say that the K5 runs very well.
It does run slightly warmer pulling hills at 70 than it does at 65-67 mph. But that I would guess has something to do with the winch, more than no VSS input.

:D
 
So do you not have EGR? Incidentally 300hp is where I'd like to be.
 
So do you not have EGR? Incidentally 300hp is where I'd like to be.
No EGR.

Realistically it might be more, but without dynoing it, who knows.
The compression is where it's at. Magic stuff happens after you go past 10:1.
The 2 highest power increases based on percentage are from 10-11 & 9-10 respectively
 
XJ steering joint conversion done. Boogied it down the crappy highway 72 at 75, just a slight twitch I need to adjust out
 
I'll take some tomorrow. Would like to scrub it up for paint first

Nothing fancy, drilled the nylon keepers out of the stock shaft and cut the hollow section off. Trimmed the XJ to fit and shimmied it together. Buzzed a few welds on and done.

For those wondering why change out the rag joint? I had one break on the trail once, had to wrap bailing wire and duct tape on it to get home.
 
10-1 with that cam is going to be interesting.. Thats a lot of cylinder pressure. Those heads are not good at fighting knock.. I hope your quench is pretty tight. Itll prob run awesome.. my 9-1 version of that build with a cam slightly larger and "headers" super comps made a ton of low end.. honestly I cant tell the difference in a truck with thorleys or without.. The H pipe made a bigger difference. But they are excellent with fitment and build wayyy better than any cheap header is.
 
10-1 with that cam is going to be interesting.. Thats a lot of cylinder pressure. Those heads are not good at fighting knock.. I hope your quench is pretty tight. Itll prob run awesome.. my 9-1 version of that build with a cam slightly larger and "headers" super comps made a ton of low end.. honestly I cant tell the difference in a truck with thorleys or without.. The H pipe made a bigger difference. But they are excellent with fitment and build wayyy better than any cheap header is.
It's had those heads on there since '98, so must be ok...
 

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