Gm847

[white97z28]

nope, i believe you are fine until you mil about 30 thou off. I did .020 on mine, lined up like i hadnt changed a thing.

edit: just saw your second post lol. In any case ive never heard of anyone taking more than 30 off. youre going to start cutting into the valve at that point. .020 and impala gaskets got me to 11.4:1

But am I going to want that high of compression? Is it needed with the smaller cc-xfi466 cam?

[JoeliusZ28]

i dont know what the specs are on that cam, a google search didnt turn anything up either (thats all the energy i have at 2am lol).

but anyway im running a 226/234 with 11.4:1 compression and i like it alot. I dont think adding a little compression can hurt ever, even on a stock cam. at the very least do impala gaskets they are worth nearly half a point. I wouldnt go much over 11.5 or it becomes difficult to tune, 12 is about the limit... ive heard 12.5 is possible if you are REALLY good at tuning.

[white97z28]

i dont know what the specs are on that cam, a google search didnt turn anything up either (thats all the energy i have at 2am lol).

but anyway im running a 226/234 with 11.4:1 compression and i like it alot. I dont think adding a little compression can hurt ever, even on a stock cam. at the very least do impala gaskets they are worth nearly half a point. I wouldnt go much over 11.5 or it becomes difficult to tune, 12 is about the limit... ive heard 12.5 is possible if you are REALLY good at tuning.

lol me to i went to bed at 2 lol. Well its a Duration 268/276, Lift .570/.565 113 LSA. well im not saying i am trying to be cheap or anything but i dont want to spend an arm and a leg on Porting and milling my stock heads...because in a few years i plan on getting better heads. Its just idk what a port job intales so idk what i should be looking for or what helps...

http://www.summitracing.com/parts/CCA-07-466-8/

[JoeliusZ28]

at .050 thats a 218/224 cam. thats just a lil guy. it would be a good cam for bottom end and still be a noticeable improvement up top. I think it would work well for you, but you could go a bit bigger if you wanted.

if you are going with a cam that size for now, you could easily get by with stock heads. obviously ported ones would be better though.

[white97z28]

at .050 thats a 218/224 cam. thats just a lil guy. it would be a good cam for bottom end and still be a noticeable improvement up top. I think it would work well for you, but you could go a bit bigger if you wanted.

if you are going with a cam that size for now, you could easily get by with stock heads. obviously ported ones would be better though.

Well what im thinking then what if i get one of these cams (http://www.summitracing.com/parts/CCA-07-467-8/) or (http://www.summitracing.com/parts/CCA-07-468-8/) and just have a mild port job done?

[JoeliusZ28]

anything in the 240 range is going to want to rev to the moon to make any power. And yes it will make power, but youre bottom end wont like it and niether will you when you realize you have to turn 4 grand plus to get the car to go anywhere in traffic.

the 230/236 is a solid performer.

honestly one of the best ways to decide what you want is to just get on youtube and watch some videos. punch in 230/236 or whatever cam and you should get a few results. btw, use the advertised duration at .050 lift. No one uses the other measurement.

I've always said its better to undercam than overcam. If you go too small, you'll know and you can always move up later. But when people go to big, they usually start hating their car and wont want to mess with it anymore.

[white97z28]

anything in the 240 range is going to want to rev to the moon to make any power. And yes it will make power, but youre bottom end wont like it and niether will you when you realize you have to turn 4 grand plus to get the car to go anywhere in traffic.

the 230/236 is a solid performer.

honestly one of the best ways to decide what you want is to just get on youtube and watch some videos. punch in 230/236 or whatever cam and you should get a few results. btw, use the advertised duration at .050 lift. No one uses the other measurement.

I've always said its better to undercam than overcam. If you go too small, you'll know and you can always move up later. But when people go to big, they usually start hating their car and wont want to mess with it anymore.

Thanks for the info i had not idea about the whole duration thing...no wonder i couldn't find videos of the cam before...but i did look it up and some people make some pretty good power off the cc-xfi467 cam with or with out major modification. but i did find this really nice video where a guy had the same duration cam but it had a 111 Lsa...did he just have a custom or do you think it is probably a different cam just same duration...

[my95z28]

IMO, its better to overcam than undercam. On a stock bottom end/ opti, I would never go with anything less than peak power being made at 6200-6300. So what it doesn't have power below 4k, how long are you going to be there if you are aggressively driving? Maybe, 2 seconds, IF you go from a dig. If you are rolling, you won't ever be there. Spin it to 6300, shift brings you back to 5000, and go from there. I never understand why people are so obsessed with power under the curve on a cammed engine.

[JoeliusZ28]

IMO, its better to overcam than undercam. On a stock bottom end/ opti, I would never go with anything less than peak power being made at 6200-6300. So what it doesn't have power below 4k, how long are you going to be there if you are aggressively driving? Maybe, 2 seconds, IF you go from a dig. If you are rolling, you won't ever be there. Spin it to 6300, shift brings you back to 5000, and go from there. I never understand why people are so obsessed with power under the curve on a cammed engine.

drive a huge cam around for a few thousand miles and get back to me.

If youre drag racing, then who gives a crap. But if you have any desire to cruise around and the car only bucks around under 3K RPM and doesnt move when you put your foot down, youre gonna hate it. period.

Also if you only make power up top youre gonna need slicks to launch, because you arent getting off the line quick with anything but a hard sidestep - which i might add just increases your chances of breaking other *stock* parts.

Lastly if you arent going to spend money on the heads, there is NO reason to do a big cam. Its like running stock manifolds on a head/cam/nitrous engine. Youre going to be making your engine rev for no reason, it could make just as much power at a lower RPM. Revving high is gonna require work everywhere in the engine if you want to do it reliably.

[my95z28]

drive a huge cam around for a few thousand miles and get back to me.

If youre drag racing, then who gives a crap. But if you have any desire to cruise around and the car only bucks around under 3K RPM and doesnt move when you put your foot down, youre gonna hate it. period.

David had a pretty big cam in his LS3, and had zero issues with cam surge. He could put it in 6th gear doing 40 mph, and have no issues. Its all about the tune.

Also if you only make power up top youre gonna need slicks to launch, because you arent getting off the line quick with anything but a hard sidestep - which i might add just increases your chances of breaking other *stock* parts.

I said that would be the only disadvantage. And if you are that concerned with your 60ft time, its going to be a pretty dedicated drag car, so that wouldn't be a concern at all.

Lastly if you arent going to spend money on the heads, there is NO reason to do a big cam. Its like running stock manifolds on a head/cam/nitrous engine. Youre going to be making your engine rev for no reason, it could make just as much power at a lower RPM. Revving high is gonna require work everywhere in the engine if you want to do it reliably.

I didn't mean that he should do a giant cam. What I meant, was that if I was going to cam an mine, I would either go with the biggest cam that won't be effected to much by stock heads, or I would go with something like Ryan has, or bigger, with all the goodies to back it up, like he has.

[JoeliusZ28]

David had a pretty big cam in his LS3, and had zero issues with cam surge. He could put it in 6th gear doing 40 mph, and have no issues. Its all about the tune.

three quick points because i gotta head out the door

1) yes it is about the tune, but remember LS1s tune better than OBD1, they have much better knock sensors and a higher tuning resolution to help dial it in. Not to mention, LS1s have an ignition system and bottom end that can handle revving.

2) an LS3 has a little more displacement than an LT1 which will help tame it down some

3) 115 LSA is tamer and more low rpm friendly than 112.

Its possible to run a GM847 without surge. but whens the last time you saw someone do everything right on an LT1 build? Its the corner cutting platform because they are cheap. Money he wants to spend on the head porting could be used for an overall better install.

[ThreeHonks]

custom grind is the only way to go with an LT1. There is not a whole lot of "good" off-the-shelf options out there nowadays for the LT1 crowd.

Kyle - IMO a cam with shift points at 6300 rpm is still a small cam. probably only in the 22x duration range on a modest LSA

Im running a 222/228 on a 112 LSA (small cam) and really love driving the car and it still makes great power up top

[Phantom409]

The 292XFI cam is the one we put in Red's stoker.
I can tell you that that cam LIKE'S TO RUN!
It's no slouch and pulls like a ***** from 1200-5500 + but she is running a 6-speed trans with 3.42 gears too.

[white97z28]

Its possible to run a GM847 without surge. but whens the last time you saw someone do everything right on an LT1 build? Its the corner cutting platform because they are cheap. Money he wants to spend on the head porting could be used for an overall better install.

So should i just go with the 230/236 xfi467 and instead of doing a head job just go with impala gaskets...rockers, lifters, springs, and just get all the good parts to do a good install?...if so what are the best or at least good for my aplication and what are the specific parts i will need....im trying to compile a list of what i need to pick up before i start tearing into this...

custom grind is the only way to go with an LT1. There is not a whole lot of "good" off-the-shelf options out there nowadays for the LT1 crowd.

Kyle - IMO a cam with shift points at 6300 rpm is still a small cam. probably only in the 22x duration range on a modest LSA

Im running a 222/228 on a 112 LSA (small cam) and really love driving the car and it still makes great power up top

Well on average whats the advantages of a custom grind and what would the price differences be?

The 292XFI cam is the one we put in Red's stoker.
I can tell you that that cam LIKE'S TO RUN!
It's no slouch and pulls like a ***** from 1200-5500 + but she is running a 6-speed trans with 3.42 gears too.

292? which cam is that?

[ThreeHonks]

there is really no price difference in a custom ground cam. It gives you the option of picking your own specs and you can use what type of lobes you want as well.

I think that the 230/236 XFI would work REALLY well for your build