As awesome as efi and LS engines are whenever I actually get something old I’m going to leave a carbed small block in it just for that reason
Huck’s 2005 Silverado
- Thread starter Huck
- Start date
So now the question is....do I get the heads milled for 11:1 compression or stick with the factory 9.9:1? 
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So now the question is....do I get the heads milled for 11:1 compression or stick with the factory 9.9:1?
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Forced induction in the future....? Hmm..
Nope, this is my DD. But with 10:1, a cam and tune, was gonna be running 93 anyway, so thinking the bump can’t hurt anything. It gets 12-14mpg as is, doubt the compression will hurt that and add power
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I believe mine is 11.1. Don’t remember. This on the current tank. Doing more highway driving this week
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I believe mine is 11.1. Don’t remember. This on the current tank. Doing more highway driving this week
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Yeah I mean compression helps with efficiency as much as power, so 1 point should only help. What heads are you running? I know 317s would have to be milked a ton to get to 11:1
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Is yours an LQ9? I think the guys I was ready that had to mill them a lot were using dished pistons, so the heads had to be milled like .050 or .055 to get 11:1.
I’ve been researching most of the day in between work and there’s so much info and so many opinions, I’m going cross eyed lol. I think .020 would get me 10.5:1 and .030 would get me 11:1 with my flat tops. Gonna keep researching and talk to a couple machine shops though. Then I’ll have to figure out which head gasket and pushrod length. I’ve got LS9 headgaskets already, so I’m hoping I can use those
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Lq4. Has flat top pistons now. I really don’t know how to figure out all that. Lol. The builder said it was 11.1 all I’ve done to it is replace head gaskets and put arp head bolts in
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Lol yeah it’s a ton of math that makes my head hurt. I do want to learn and understand it though. Pretty sure I’ve got an engine building boom at home, need to study up. Waiting to hear back from one of the local machine shops, gonna get his opinion on my combo.
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Do you guys have emissions testing in Jawja? If not, rip out the cats, do long tubes, and a good tune with everything else you're planning and you'll see one hell of an increase. Headers and my tune on my current truck was worth EVERY penny.
We do in 13 of the 158 counties and I’m in one of them lol. But it’s just a sniffer, no visual. I’ve had several vehicles with LTs and no cats, as long as it’s tuned properly it’ll pass. If I could find a set of LTs that fit a 4wd properly, I would but I’m a little gun shy after the fiasco with my red truck. The drivers side collector sat right where the front driveshaft needed to be
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I’ll look around and see. Would love to put headers on while I’m at it. I think I’ve pretty well decided against milling the heads, not really worth it in a big heavy truck. I’ll pull the heads and get them inspected/cleaned up and new guides and seats installed. That way I don’t have to worry about different pushrods and PTV issues
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fit perfect. The off road y pipe is a bit close to the trans crossmember though
I have ARH headers on my ‘03 4wd NBS. Fit perfectly. (A bit spendy, but they’re nice.!)
Speed engineering 1-7/8fit perfect. The off road y pipe is a bit close to the trans crossmember though
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Found a couple videos of guys putting them on Z71s, thought the same. That’s no big deal though, I’ll wrap that area just for good measure. A buddy of mine has a set that he said he’d let go cheap, so I’m going speed engineering
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Found a couple videos of guys putting them on Z71s, thought the same. That’s no big deal though, I’ll wrap that area just for good measure. A buddy of mine has a set that he said he’d let go cheap, so I’m going speed engineering
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I know a guy who used speed engineering headers on his 2004 Tahoe 4x4, and they ran into his front driveshaft. Hope that wouldn’t be the situation with you, just a heads up.
I’ve got my fingers crossed. I wasn’t gonna mess with headers because every set I’ve ever put on has had issues, LPP, whatever I had on my red truck, pacesetters, all of them. But supposedly speed engineering has clocked the drivers side far enough to clear. For the price I’m getting these, it’s worth a shot
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