Questions about the LT4 cam kit
Questions about the LT4 cam kit ok, now before i start i am getting a hell of a deal on the entire kit. Valve springs, RR's, retainers, ect. and trust me i want so bad to go with a CC503, but i cant pass this deal up.
So i have heard some people having problems with the poly locks backing off that come with that kit... should i get new ones? if so which ones? I will be getting Trickflow hardened pushrods (TFS-21407200 is the correct part number from summit correct?), but to make sure, i do not need to get guide plates correct? Ill be getting a new timing chain kit, i already have a new opti, i will probably get a EWP. anything else you can think of? im not 100% sure if its coming with lifters or not. the car has 115,xxx miles. should i get new ones?
So i have heard some people having problems with the poly locks backing off that come with that kit... should i get new ones? if so which ones? I will be getting Trickflow hardened pushrods (TFS-21407200 is the correct part number from summit correct?), but to make sure, i do not need to get guide plates correct? Ill be getting a new timing chain kit, i already have a new opti, i will probably get a EWP. anything else you can think of? im not 100% sure if its coming with lifters or not. the car has 115,xxx miles. should i get new ones?
Last edited by 67goatman455; Oct 25, 2009 at 10:38 AM.
I now have comp polys because I needed longer locks since I had to run a shorter push rod.
I had no problems with the poly locks that came with the kit, I believe they're crane.
Before you order your pushrods, order a new set of ls7 lifters, then measure your pushrod length, then order the right push rods.
I still run the stock waterpump, but if your set on an electric you mise well buy a cloyes double roller.
As long as they're the bowtie SA RR's you do not need guide plates.
I had no problems with the poly locks that came with the kit, I believe they're crane.
Before you order your pushrods, order a new set of ls7 lifters, then measure your pushrod length, then order the right push rods.
I still run the stock waterpump, but if your set on an electric you mise well buy a cloyes double roller.
As long as they're the bowtie SA RR's you do not need guide plates.
ok looks like ill pick up some LS7 lifters. do i need to check pushrod height when swapping to these? can i not just use the standard 7.200 length?
No i'm not set on the electric waterpump. what timing chain set should i get just for a nice stock replacement? If i decide on a EWP whats the part number or a better description of the timing set? Summit had 4-5 of them
No i'm not set on the electric waterpump. what timing chain set should i get just for a nice stock replacement? If i decide on a EWP whats the part number or a better description of the timing set? Summit had 4-5 of them
Last edited by 67goatman455; Oct 25, 2009 at 11:01 AM.
I would ski[p the LS7 lifters if your's are in good shape. They are a cheap stock replacement, people are MISTAKING this for being of some performance value.
The LT4 package comes with lift limited rockers and insufficient springs, they are OK with LT4 heads because those have special liteweight valves.
Oh and guideplates should only be used with non-sa rockers, the "kit" ones are SA.
Not the screaming deal folks MISTAKE it for.
The LT4 package comes with lift limited rockers and insufficient springs, they are OK with LT4 heads because those have special liteweight valves.
Oh and guideplates should only be used with non-sa rockers, the "kit" ones are SA.
Not the screaming deal folks MISTAKE it for.
The LS7 Lifters are more suited for higher RPM's..that one was beaten to hell in the Gen III section years ago man..no mistake or whatever you want to call it about it.
But hey whatever floats your boat.
But hey whatever floats your boat.
I used everything on mine that came in the kit and haven't had a problem. I installed the kit along with a new timing chain (factory replacement because I used a regular water pump) and a new opti and have put almost 10k dd miles on it since. I reused my pushrods and lifters and haven't had a problem. Good luck and hope you enjoy it.
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I would ski[p the LS7 lifters if your's are in good shape. They are a cheap stock replacement, people are MISTAKING this for being of some performance value.
The LT4 package comes with lift limited rockers and insufficient springs, they are OK with LT4 heads because those have special liteweight valves.
Oh and guideplates should only be used with non-sa rockers, the "kit" ones are SA.
Not the screaming deal folks MISTAKE it for.
The LT4 package comes with lift limited rockers and insufficient springs, they are OK with LT4 heads because those have special liteweight valves.
Oh and guideplates should only be used with non-sa rockers, the "kit" ones are SA.
Not the screaming deal folks MISTAKE it for.
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Verdad Gallardo I used everything on mine that came in the kit and haven't had a problem. I installed the kit along with a new timing chain (factory replacement because I used a regular water pump) and a new opti and have put almost 10k dd miles on it since. I reused my pushrods and lifters and haven't had a problem. Good luck and hope you enjoy it.
I just used a gm chain. Don't remember the part number. Well I don't know about your cars exact set up but I ran my car in the 1000 ft about a month ago with mods in my sig (except for the duals cause I had a gmmg on it) and ran a
60 - 2.004
1000 ft - 11.03 @ 97.6 mph
I could have gotten into the 10's with it but my car wouldn't shift into 3rd at WOT so I was pegged out on the limiter in 2nd about the 800 ft mark. And that was with street tires. Oh well, still had fun. With a good stall (and a new tranny) and some 3.73's I hope to get deep into the 10's (1000 ft). Haven't had a chance to run the 1/4 yet so we'll see next year.
60 - 2.004
1000 ft - 11.03 @ 97.6 mph
I could have gotten into the 10's with it but my car wouldn't shift into 3rd at WOT so I was pegged out on the limiter in 2nd about the 800 ft mark. And that was with street tires. Oh well, still had fun. With a good stall (and a new tranny) and some 3.73's I hope to get deep into the 10's (1000 ft). Haven't had a chance to run the 1/4 yet so we'll see next year.
hmm, ok looks like i'm about lined out, just need to figure out what timing chain kit to go with. i seem to have the same setup as you basically. i'm not sure what my 1000ft time was....
I was working for a GM dealer at the time. I just got the chain from there and I thinkit cost me $25. That was with my discount though. I think they run like $40 regular price. Its not a bad price.
Nope, I just got a new chain. I kind of went crazy when I did mine too. I resealed the whole motor and put a shift kit and new filter in the trans, lol. Yeah I worked for a gm dealer as a tech for almost 5 years. I had to quit to finish up school (A&P school). I think cost on it was like m$25. Its been almost a year now since I've done it so I really don't remember.
The LS7's have a different spring and cup design, they are more suited for higher RPM's. Me personally I currently run them and I would go with them if needed. They are a stock replacement cause they fit, but they are a superior design.
Ok, so they have a higher rpm handling capacity, not exactly gonna be spinning a hotcam to 7000 are you?
That and the fact that they just complicate things by requiring a different pushrod length, I wouldnt bother.
Whatever floats your boat though, some people like throwing money away because it makes them "feel good".
I run a cam with lobes a hell of a lot more aggressive than the hotcam and its fine on the stock lifters.
.02
never had problems with the poly locks, i used the LT4 heavy duty chain, re used my stock lifters and bought ssome hardened 7.2 pushrods. the cam kit alone dropped my 1/4mile a full second. 13.0@105. times in my sig.