cam specs for my 02 gagt.

[SappySE107]

If you want to use 3500 springs, you can't go much bigger than stock on the cam. I have posted the 1280 specs for what you would get if you ordered it vs what is on that list. I will have it speced in the motor to get the real intake centerline soon as well.

With a good tune, you can run a decent sized cam without vacuum/brake issues. What heads/intakes are you going to use and ported or stock?

[gectek]

3400 heads stock, ported upper 3400 and ported lower 3400, hopefully a 62 or 65mm tb, i have the LS6 springs on order already, so if you have the 3400 engine, can u get possible pushrod lengths from there, so i could get the lengths already and use those for my engine and cam...i think im leaning toward the 1280 lobe, looks good and i have the dhp powertuner so i can tune, and also when i get the cam im getting new cam bearings, but i thougth i heard that the 4.3l had better bearings for the 3400, wider or something like that.

this car is my DD, and i will get shop time to work on it, but i want it running ASAP so thats why im getting everything first, and would like to be able to just order the pushrods and not have to measure everything and take extra time that i would be without a ride. i might not go as big as the 1280, maybe a step or 2 below that. i just want a good cam without much headache with the brakes and hvac system with tuning

[gectek]

ok, so im very interested in the 1280, but from what you showed before, there isnt much change from the card to the actual...and the centerline, is that going to be a problem if the cam is installed straight up, or does it move the powerband up too much in the higher revs? isnt 3400 stock like from 2400-5000 or something like that

[SappySE107]

1280 isn't too big to kill your brakes and with the DHP, its even better. Stock heads kinda sucks but perhaps in the future you can upgrade that as well.

Just simulated it on a stock 3400 and it goes from 176 peak hp at 4500 to 198 peak at 4500. Id say thats a pretty good grind, keeping the powerband about the same but higher. 22hp on a stock engine simulation isn't bad either. Adding headers shows about the same increase as well. Only problem is the lift and you want to use 3500 springs. I might be able to get the same grind or close with less lift. That or perhaps a different grind? .517/.539 lift is what the 1280 gets you.

[SappySE107]

It will put the powerband higher if you keep the centerline as it is. I have to get this 1280 cam in the block and spec it (just cleaned the engine up). If I can drill the cam gears for a new timing mark though, we can get the ICL that we want. Just waiting for the drill press to show up so I can buy bits and give it a shot.

The 1312 does't look to bad. The 1280 will give a bit more up top and both look pretty much the same down low. Thats comparing real world 1280 specs to theoretical 1312 specs.

[SappySE107]

Lets try it and see

Total ass. Bye bye low end. Peak is up but overall its not good at all. Maybe for a seriously modded motor with high compression.

[gectek]

ok, so maybe a little lower lift with what i am looking for, i wanna keep good low end and add a little to the middle and top, i dont need over 6k revs i dont think, maybe 61-6200 at the most...i just want a good breathing cam, good idle and descent powerband like stock, but maybe a bit up in the upper end

1357 looks maybe better...idk

[gectek]

yah well ill have the ls6 springs in by then, i have the ss headers and borla cat back, and a cai, so air in and out isnt that big a deal, and then later ill upgrade with the 3400 ported heads, or maybe just a complete 3500 swap after that. i wanna keep it small right now though. im takin big steps right now for some reason with everything going together. but yah, maybe a little less lift, and hopefully gettig maybe a double roller with the modified cam gear??? that would be cool, id take 2...lol. so soon ill have the ported lower and ill have an upper i need u to port that ill send in, and the ls6 springs will be in and ready for the cam, new lifters and bearings, so i just want good specs with something to stay on the good side of 6k and about kicking in where the stocker does...i think like 24-2600 or so, thats fine with me. im thinking just a little less lift, even though u show the give a little here and there with the lobe grinds, it might be nice to have an adjustable gear to set it straight up or up/back

[SappySE107]

The double roller doesn't fit right now. If you want your AC, I am not sure what will need to be done just yet. Im also not sure on space anyway for some applications. I would really like to see how the comp single roller for the LS1 is holding up for them. We have a similar chain to the LS1 (wont swap though).

Did you see the comp 26986 springs I have on the store? You could use that cam with those springs and not have to worry about seats, seals, or coil bind.

Ill try to make a guide on selecting a cam.

[SappySE107]

The last 1357 I got had a 114 LSA. I guess they modified that grind for a different LSA but kept the lobes how they wanted as if it was 112.

1280 Grind vs 1357 Grind with 112 LSA Dynomation Simulation on stock 3400.

[gectek]

damn, well i need a lower powerband than peak at almost 6k, but i want the output of the 1357, but the 1280 isnt bad eitherand is that with everything else stock? also, i dont care about the HP, it the torque #s i wanna know

[gectek]

well i got the ls6, because i thought the comp springs had a little too much $$$ for what i was looking for, plus i need new seals anyway, so it works so far, and i would like to see if i could get a grind u have already made and have used, so in case u have the pushrod lengths, then i could just use your measurements, like i said i need the least amount of downtime possible. im liking that 1280 though, good ower band for my operating range.

for the springs i was just looking for a good upgrade over my stockers(which have 174k mi on the clock) at a good price. also are those #s u posted o the cam specs with the cam installed straight up?

[prophiseer]

well im building my 4t45 for just my type of driving and punishment, which is alot, so i know it will hold up, give me a little time and ill post #s and hopefully offer perf rebuilds(if i can ever get pricing right)

actually, man, I really think the T45E can stand up to some major punisment if built right, and IMO, it's lighter weight to the T65E and it's lower relative torque capacity make it a better choice for N/A applications, especially with the smaller 60* motors compared to the 90*. I really think this tranny has a lot of potential, and I base this mostly off of the T45's gear ratios, FDR, torque multiplication and when it typically goes into a direct drive state.
If you find a good amount of information on buildups for this tranny, I'd be really interested to hear about it, for sure. If only I had the extra money to do my own research and experimentation !!!

[gectek]

well i will be offering the performance rebuilds soon for them, and ill even sell the parts if you dont want me to do the trans, and ill be getting my LSD in soon, so then mine ill go together and be able to handle alot. i like it alotmore than the t65, i just like the way it shifts, and doesnt even need the perf shift mode. plus the potential with higher stall converters and the cooler to keep temps down, i likes it alot...ill keep you posted on how it turns out

[gectek]

ok, so im lookin at the specs and was wanting some input on it, what i am looking for is good power with a widened stock powerband, which is like 2400 - 4000 IIRC, and i am def looking at higher lift, but not extreme. i want really good idle so i will post the few lobes that i am looking at and see what yall say. i will be using the ported LIM/UIM and 65mm TB, headers/catback, CAI and PT, along with custom length pushrods and ls6 springs/titanium retainers/hardened steel locks/ and ls6 seats with the appropriate seals. i have all the spring stuff, and just want to know what would make better power than stock while not sacrificing idle or lower end power. the lobes i am looking at are

1211 - I like the LSA and dur on this to keep everything smooth, but i wanna make sure that its gonna come out like that, but it looks like it installs straight up with the specs given.

1393 - same as 1211 with higher lift, but i dont know if coil bind wil be an issue or not, since the ls6 seats give me .060 shim height, and i dont remember the stock LS6 spring coil bind spec

1312 - about the same as the other two, installed straight up will give those specs, and a little more lift and dur on the exhaust, supposedly better for power???

just looking for some input, and also if someone knows the lift stall of the stock unported heads, that would be helpful also to help me determine what lift i should go with before i stop producing power and hit the land of diminishing returns

thanks