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    LS1 cam, LT4 cam, vortec 350?

    I've been trying to research certain cams and I'm finding just trying to finish out what I might do as far as a camshaft is concerned. I've heard that a stock LT4 cam is pretty good cheap cam for a Vortec 350. Also thought I saw somewhere that said a stock LS1 cam was pretty good too. Which is best for a L31 with stock internals? Also would it benefit to have 1.6 ratio rockers with any of those cams or just 1.6 rockers with the stock L31 cam?

    I've found a pretty good deal on a stock LS1 cam with factory beehive springs and push rods out of a 02 z28. Just wondering if I should jump on it or not. Don't want it if I can't use it. Thanks.
    93 Chevy S10 ext. cab. 4.3 5 speed 4wd -> Carbed 350 Vortec with LT4 hotcam in progress
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    Re: LS1 cam, LT4 cam, vortec 350?

    I don't think the gen III+ cams will work in gen I engines. . . at least not based on cross referencing Summit's site. I thought the same thing at one time because LS1 cams are suprisingly small, only 20X/20X and a tick under .500" lift. Seemed like an enticing grind.
    Quote Originally Posted by Quyonmob View Post
    Straight pipes are for peckerheads. . .
    '98 K1500 ECSB 5.7, 4L80E, 14BSF, 4.10/G80, 7,200# GVW springs, 8600# GVW calipers/pads, 411/EFI Live.

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    Re: LS1 cam, LT4 cam, vortec 350?

    good luck getting an LS1 cam to fit into a Gen I block...
    77 Chevy K20 - 80 GMC K2500 (in pieces)
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    Re: LS1 cam, LT4 cam, vortec 350?

    That's why I was asking. So a LT4 cam is the way to go. Would it be better with 1.6 ratio rockers or not? Or just leave cams alone and just put 1.6 rockers w/ stock cam?
    93 Chevy S10 ext. cab. 4.3 5 speed 4wd -> Carbed 350 Vortec with LT4 hotcam in progress
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    Supporting Gold Member GreaseDog's Avatar
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    Re: LS1 cam, LT4 cam, vortec 350?

    you're looking at putting this into your 00?
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    Re: LS1 cam, LT4 cam, vortec 350?

    Well, now that I know that the LS1 cam isn't compatible, if I could get a LT4 cam for a good price, I'll jump on it. I would like to cam the truck so long as I don't kill my driveability of it. I only asked about the LS1 cam because I found one for a really good price, but I wasn't sure if it was compatable with my 350.
    93 Chevy S10 ext. cab. 4.3 5 speed 4wd -> Carbed 350 Vortec with LT4 hotcam in progress
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    Re: LS1 cam, LT4 cam, vortec 350?

    We have the LT4 production cam in our denali. I will tell you tomorrow how it runs as we just installed it. It tops out at .480 lift which is the max for stock vortec heads, you can change springs and retainers and go to .550 though. It isn't really a truck cam as it was designed for the vette. I did advance the cam 4 degrees to see if I can get a little more low end out of it. You will have to grind down the drive pin a bit in that it is a long pin used for the optispark on the LT engines. It does use the 1.6 narrow body self aligning rockers. I went with this cam not for performance but MPG. It uses a 115 LSA instead of the vortec's 111 LSA. The LSA should allow more vacuum which should give better MPG.
    96 LT4 production cam: 203/210 @.050, 476/480 (with 1.6 rocker) 115 LSA. (446/450 with 1.5 rocker)
    L31 cam: 191/196 @.050, 414/428 (with 1.5 rocker) 111 LSA. (442/456 with 1.6 rocker)
    89 GMC Stepside 2WD 4/6 drop, working on the stroker again!!!
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    Re: LS1 cam, LT4 cam, vortec 350?

    So the LT4 comes with 1.6 rockers too? Looks like it should help out a little bit with those numbers there. I always thought that a cam would make gas mileage worse. How do you go about advancing it 4 degrees? Can't you advance it with the distributor?
    93 Chevy S10 ext. cab. 4.3 5 speed 4wd -> Carbed 350 Vortec with LT4 hotcam in progress
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    Supporting Gold Member GreaseDog's Avatar
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    Re: LS1 cam, LT4 cam, vortec 350?

    no, you can't adjust valve timing at the distributor, you can only adjust ignition timing there.
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    Re: LS1 cam, LT4 cam, vortec 350?

    I thought vortec ignition timing was only controlled by the computer?
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    1996 silvy, 6"bds, sf14bolt, eaton elocker, precision 4.56s, 37" claws;
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    Re: LS1 cam, LT4 cam, vortec 350?

    Quote Originally Posted by mgrotel View Post
    I thought vortec ignition timing was only controlled by the computer?
    Well the computer does control the timing but it has to be set at 0 +/- 2 with a scan tool by turning the distributor. If the distributor is too much out of wack, the computer can't adjust it that much, it'll throw a code.

    Quote Originally Posted by GreaseDog View Post
    no, you can't adjust valve timing at the distributor, you can only adjust ignition timing there.
    I misunderstood what skylark stated. But I also didn't know that you could adjust the valve timing like that. There is still a lot I would like to learn about engines.

    Still looking forward to what gains skylark got from the cam swap.
    93 Chevy S10 ext. cab. 4.3 5 speed 4wd -> Carbed 350 Vortec with LT4 hotcam in progress
    07 Saturn Outlook XR

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    Re: LS1 cam, LT4 cam, vortec 350?

    How much are these cams? I still have a similar used one for sale
    awesome sig(s) xZoomerZx!
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    2006 Infiniti G35 - dropped on coils, bottle-fed

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    Re: LS1 cam, LT4 cam, vortec 350?

    And I think that cam will have quite a bit of lowend power without advancing it
    awesome sig(s) xZoomerZx!
    1996 silvy, 6"bds, sf14bolt, eaton elocker, precision 4.56s, 37" claws;
    383ci vortec, compcams 218/224 .495"/.502" 110*;
    longtubes, magnaflow exhaust, 0411
    2006 Infiniti G35 - dropped on coils, bottle-fed

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    Re: LS1 cam, LT4 cam, vortec 350?

    Quote Originally Posted by mgrotel View Post
    And I think that cam will have quite a bit of lowend power without advancing it
    The engine in the 97 Express van is the 4-bolt main GM crate engine for a 8600+ GVW application with LT4 springs, LT4 retainers, Crane 1.6:1 full roller self-aligning rockers, Production LT4 camshaft, stock single row roller timing chain, stock manifolds, running the stock exhaust system. I smoothed out the intake manifold and removed the throttle restrictor. The stock 1997 Black box has been reflashed to give 30* of timing at WOT above 3,600 rpm (F-car LT1 spark map tweaked for a little more low-end torque) and the PE fueling has been leaned out. The distributor is set at +10* on a scan tool, has been set that way for years. The engine really responed to the additional injector advance although the ignition timing was unchanged. I upped the WOT shift points to 5,500 rpm and made some small tweaks to the light throttle shifts as well as enabled 2nd gear lockup like my old 700r4. The 4L60E had smoked torque converter clutch at a mere 57,000 miles so I put in a remanufactured 4.3 2000 rpm converter and eliminated the PWM TCC setup with a Transgo Shift Kit. With 3.42 gears and P255/70/R15 tires the Van gets 15 mpg around town and 19+ on the highway running 75 mph with the a/c on. I was running through Houston this summer and a guy got angry that I was trying to pass his P71 Crown Victoria on 45, decided to swerve at me a couple of times, I flattened the throttle to the floor running 75 mph and got a 4-2 downshift and left his stupid 4.6 powered tank in the dust.
    Last edited by Fast305; 08-28-2011 at 05:04 PM.
    1997 G1500, 5.7, 906s 2.02/1.60, GM 395' marine cam, 1.7 RR's, Marine Intake, BBK TB, 85mm MAF, 6.5 aircleaner, Thorley Tri-Ys, Thunderbolt 2.5 cats, Dynomax 22865 muffler, 4L80E, 0411, Hydroboost, 9.5" 14-bolt 3.73s, 8800 GVW front calipers, March 4490 pulleys, AD244 alt, D-Max fan

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    Re: LS1 cam, LT4 cam, vortec 350?

    That sounds pretty good. I like your set-up! I betcha that guy in the Crown Vic was pretty surprised to see a full size van walk away from him like that!

    So a production LT4 cam with 1.6 rockers would be a good all around upgrade for power and mileage on a '00 vortec 350?
    93 Chevy S10 ext. cab. 4.3 5 speed 4wd -> Carbed 350 Vortec with LT4 hotcam in progress
    07 Saturn Outlook XR

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    Re: LS1 cam, LT4 cam, vortec 350?

    Quote Originally Posted by JadXtreme View Post
    I misunderstood what skylark stated. But I also didn't know that you could adjust the valve timing like that. There is still a lot I would like to learn about engines.
    Still looking forward to what gains skylark got from the cam swap.
    Well, ours runs but it is hunting for idle. I only ran it for about 20 seconds. I still need to do an oil filter relocation kit, fuel filter, reinstall the hood latch, hood and grill before I drive it. The valve timing was advanced using a cloyes timing set that has 3 different key ways for the crank, 1 is straight up at 0 degrees, 1 is 4 degrees retarded (it will give more top end) and the last one is 4 degrees advanced (more bottom). I like a nice sweet bottom! :)
    89 GMC Stepside 2WD 4/6 drop, working on the stroker again!!!
    Y2K Chevy K3500 CCLB Dually 6.5, the Black Pearl.

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    Re: LS1 cam, LT4 cam, vortec 350?

    Quote Originally Posted by JadXtreme View Post
    That sounds pretty good. I like your set-up! I betcha that guy in the Crown Vic was pretty surprised to see a full size van walk away from him like that!

    So a production LT4 cam with 1.6 rockers would be a good all around upgrade for power and mileage on a '00 vortec 350?
    I think you would like the production LT4 cam, I have used it in two builds and both ran GREAT.

    It was me, two of my buddies and our girl friends on our way back from a 4 day weekend on the beach and fishing. The back of the van was piled practically to the roof with our bags, fishing gear, icechest of beer in the back, etc. He was pissed and my buddies were all laughing. I held it up near 90 for a mile or so and he dropped back, dropped into the right lane, and took the next exit.

    I watched a 2006 P71 run an embarrasing 12.13s @ 57 mph 1/8 mile run the other night at Texas Raceway in Kennedale so they are nothing special, but then again a van weighing in at 7,000 lbs isn't exactly a rocket ship either.
    1997 G1500, 5.7, 906s 2.02/1.60, GM 395' marine cam, 1.7 RR's, Marine Intake, BBK TB, 85mm MAF, 6.5 aircleaner, Thorley Tri-Ys, Thunderbolt 2.5 cats, Dynomax 22865 muffler, 4L80E, 0411, Hydroboost, 9.5" 14-bolt 3.73s, 8800 GVW front calipers, March 4490 pulleys, AD244 alt, D-Max fan

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    Re: LS1 cam, LT4 cam, vortec 350?

    Quote Originally Posted by skylark View Post
    Well, ours runs but it is hunting for idle. I only ran it for about 20 seconds. I still need to do an oil filter relocation kit, fuel filter, reinstall the hood latch, hood and grill before I drive it. The valve timing was advanced using a cloyes timing set that has 3 different key ways for the crank, 1 is straight up at 0 degrees, 1 is 4 degrees retarded (it will give more top end) and the last one is 4 degrees advanced (more bottom). I like a nice sweet bottom! :)
    Sounds like you might have a vacuum leak or a metered air leak. Check all the PCV setup and make sure than none of the intake/pcv tubing is loose or leaking. Tighten all the clamps. After that make sure your cam position sensor in the distributor is set within tolerance, they really do not like being retarded at all. Mine likes atleast 4* advance but runs best at 10* advance, 14* will set a code. You should also make sure that the valves are correctly lashed. Then take it for a drive, after a little time adapting and learning it should run as smooth as a babies bottem and have great mid-range power.
    1997 G1500, 5.7, 906s 2.02/1.60, GM 395' marine cam, 1.7 RR's, Marine Intake, BBK TB, 85mm MAF, 6.5 aircleaner, Thorley Tri-Ys, Thunderbolt 2.5 cats, Dynomax 22865 muffler, 4L80E, 0411, Hydroboost, 9.5" 14-bolt 3.73s, 8800 GVW front calipers, March 4490 pulleys, AD244 alt, D-Max fan

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    Re: LS1 cam, LT4 cam, vortec 350?

    I does run nice and smooth until about 3000 rpm, then it is like you shut the key off. Scanner says ckp intermittent. I checked the grounds, 2 on the back of the head, 1 on the thermostat housing and 1 on the block by the ckp. I do have a spare sensor at my dads house but that will have to wait until tomorrow. I do need to set the timing properly, it is at -9 right now. I'm using the original sensor though, it does seem odd that I have a problem now.
    89 GMC Stepside 2WD 4/6 drop, working on the stroker again!!!
    Y2K Chevy K3500 CCLB Dually 6.5, the Black Pearl.

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    Re: LS1 cam, LT4 cam, vortec 350?

    I had a sneaky ground issue, the ground at the block must have loosened when I took the nut off. On to the denali. My list O' performance: LT4 production cam advanced 4 degrees, 1.6 full roller rockers, v max spacer, JBA shortie headers, no cats, mandrel bent 2 1/4 y pipe to a single 3" magnaflow, e fans, vette servo and a blackbear tune. Stout? No. Impressive? No. Was that the goal? No. It does run stronger and pull harder but the intent was to hit 20 MPG @ 75 MPH. I won't know until friday on that one. If I was going for performance then I would be disappointed. I spent around $1300 in search of 3-4 MPG with the hope of a bit better power.
    89 GMC Stepside 2WD 4/6 drop, working on the stroker again!!!
    Y2K Chevy K3500 CCLB Dually 6.5, the Black Pearl.

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