Hemi Killer

iTrader: (6)

My truck makes good power (Mods in sig) but on the dyno, it only makes 394/408 locked in 3rd gear. The power curve is good but takes a dump right about 5600 rpms. It should pull to at least 6000-6200 with the cam and ported 90/90 set-up. Could it be a tooth off? I would think it would idle and drive like crap if that was the case. I know nothing about installing or checking cams or I'd check it myself. I've got the hex-adjust timing chain and the engine builder told me at first he advanced it 4*, I then told him it already had a 4* advance ground in it. He messed with it before loading it up in the back of my truck and said that he fixed it to where it was straight up. I know the patriot heads could be upgraded to something like TFS or AFRs and make a lot more power, but they shouldn't be holding me back that much. Right?

Here is a link to the other post a while back with my dyno chart:
https://ls1tech.com/forums/dynamometer-results-comparisons/826427-what-do-head-problems-look-like-dyno.html

5.3LJimmy

iTrader: (10)

I'd say the cam is to far advanced. It could still drive fine being off a tooth as long as there is no piston to valve contact. Does it idle steady with a smooth lope or is it choppy and uneven sounding? If the cam is advanced to much the exhaust valves will open early and make it sound like a blown alcohol motor idling. Is it possible for you to get an idle video and post it up?

5_02ls1

iTrader: (20)

^^^yeah id say he left it +4 hell thats 8*total advance...that cam should peak ALLLLOT higher than 5600...bet its a tourqe monster though...

SOMbitch

iTrader: (8)

I agree^^

Apples and oranges cause I'm a puny 346 but cams are similiar and I'm still carrying at 6500 on a 111+2 I just don't wanna spin higher on my 98 OEM rodbolts. I am jealous of all that torque though. Wish my 99 Z71 was a stump puller like that

Hemi Killer

iTrader: (6)

I'm gonna try and get it checked by futral as soon as I get some extra cash. I can't post a video yet, don't have internet at the house and then I have to figure out how to download it and all that. It doesn't idle all that bad. The cats & mufflers eat up a bunch of the lope. It idles about the same as my old cammed 5.3.

Patrick G

iTrader: (14)

I'd wager the cam is in at 106 intake centerline and not 110 as it should be. Probably not a bad powerband for a truck, but you're still not getting best use of the combo the way it sits.

frito1

iTrader: (12)

Another thing to consider is that you are probably matching your converter stall nicely right now. Move the cam and you should have the need for a taller stall

Hemi Killer

iTrader: (6)

Thanks for the reply! I'll definitely have it checked out.

Hemi Killer

iTrader: (6)

I honestly don't think it will, because when I was running the stock 1600 converter, it would still just smoke the tires. When I still had the stock converter and stock truck intake, it spun it's *** off and still ran 13.1 @ 105mph with a 2.1 60'. After I have it looked at and put back on the dyno, hopefully it'll make ~410-415 rwhp and pull to at least 6200-6300 rpms. Hell thats the only reason I bought the ported FAST 90/90 setup was to help the upper rpms! In about a year when I get out of school, I'd like to get some trick flow 215s, 125-150 shot and upgrade to the level 5 FLT 4L60E

Hopefully that'll be good for a low or mid 11 second street truck.

Hemi Killer

iTrader: (6)

If the cam is installed at the 106 intake centerline, how much power would I gain at the 110 intake centerline? How much would it move the powerband up? Thanks.