I need solid roller cam for my 383. It consist of a Scat 4340 crank, eagle 6" rods, SRP 12:1 piston's, ported stock LT1 castings by Lloyd Elliot. The car really never hits the street. I won't it to roll so I am looking something nice. I was thinking something along the lines of a 25X-26X @.050 and lift in the 600's with a 110 or 108 LSA. I will also be shooting a 200 shot on the direct port setup. Also could I get yalls opion on what lifter and spring setup to use. I did a search and everyone is screaming diff. stuff. I have no clue what lifter, people talked about the 871's, 873's, 888's and the 883's ??? As far as springs looks like the 954's or the 944's. I figured I would post this in here to get some good advice from some experts.



JK

 

my intentions aren't to make this sound harsh. most people come in here from the other parts of the board that don't usually come in here and don't really know what goes on

"###Stroker motors - high end discussion only

That means you come here AFTER you have exhausted the resources at the engine specific forums. If you have questions like:

-what is a stroker
-where do I buy a stroker kit
-what rods do I need
-what cam do I need

.... that is, basic type of info. There are numerous people on LT1 Tech, LS1 Tech, etc who can help you. Most of the people here on Advanced Tech who own LT1's will also respond to posts on LT1 Tech, etc. You will actually have a much larger source of "basic" information on those boards, than you will have here.

 

I agree but if I was asking weather to use a CC305 or a hotcam that would be one thing. But I am looking to get max effort out of this motor with the listed parts and not really worring about idle streetablity or other stuff. I have been around here awhile and read up quite a bit. I thought that I might would get bashed on this question but the LT1 tech forum is just crowed with to much BS IMO. The same question's are asked day after day. You could not ask a question in there that has not already been asked. I was hoping to get some thoughts from people like SStrokerace, Jordon, etc... not Joe Blow asking about a 224/230 cam. I have done my searchs and not really come up with to much. I have read several hours tha past few nights. Hell I went back as far as seeing where Jason short had stated that he like the Crane solid lifters. That was a while back. I did find one SR that a few seemed to like that was in this thread.


http://web.camaross.com/forums/showt...ghlight=95bird

But that guy is running a 355.


Thanks, JK

 

Before even guesstimating, it's necessary to know how high you plan to rev this thing. Keeping in mind that the stock PCM will not be useful past 7,000rpm. Also, how long do you want it to last, especially springs? And what is the "free drop" of the valve to piston crown? What kind of rocker setup do you have in mind? Are you willing to invest in a set of shaft mounts?

For a max effort motor, you may want to invest a couple of hundred bucks in having a custom cam designed. I know that Bret Bauer can provide this service.

Rich Krause

 

nobody uses the phone anymore..Call comp crower crane etc etc and see what they reccomend..You get a better guess from cammaster..Then go from there

without the cars weight and trans specs as well as the head flow sheets i can tell you that you want a 112-114 cut on the cam..108 will blow it all out your headers..

 

I plan on turning it to 7000K rpm. Its not much of a street car so the car won't see much street action. I aint worried about the springs lasting. Tranny is a TH350. Car still ways probally 3500 with driver. I plan on using the comp pro mag RR's with stud girdles.


JK

 

I'm assuming you are going to continue to use both the blower and the nitrous? In that case, I agree with LT1 1980 malibu that a 108LSA will be too narrow.

I'll go out on a limb and give you a suggestion, but I still recommend spending a few $$$ to get a pro to work out some specs. You might look at something on the order of 290-300 degrees "advertised duration" on the intake with an additional 10-15 degrees on the exhaust and a 112-4LSA. That would translate into mid 260's at 0.050" as you suggested in your original post. Lift in the .650-.700" range would be fine. Have it gorund with at least 4 degrees of advance to enhince the mid range. Again, professional advice is advised.

Rich Krause

 

Rich I sold the blower. So this is just going to be a Nitrous motor only. I really won't to focus on how well it runs N/A though. I should have specified in the post.


JK

 

Not sure why you feel your LT1 request doesn't belong on "LT1 Tech"... or since you are talking nitrous.... on "N2O Tech"....

Yes, your post won't (= will not) sink to the bottom of the page as fast, but its not fair to tell everyone to post LT1 Tech questions on LT1 Tech, and then bend the rules.

Moving to N2O Tech.....

 

So you will have to give up membership in the boost+juice club I think it's dynamite street/strip combo 'cause it allows one to get away with a pretty mild tune for the street and crank it up when the traction is there (the track). But since you are building a strip only car, the N2O may be a better way to get where you want. Be interested to know how you are gonna stage the N2O, etc. Will 300hp get you where you want?

Anyway, without the blower a narrower LSA may be in order. You will need more overlap. Good nitrous cams aren't too different from good NA cams, but need more exhaust duration. This will be an interesting combo, what brand converter do you plan to use and what rear end gears are you thinking of? The 7,000rpm limitation is something you will need to keep in mind. You can't go too big on a cam or you will move the "sweet spot" above where you can use it. I think your original post is in the right range for intake duration but you will need at leat 12-15 degrees more exhaust duration than intake. A 110 or so LSA would be as low as I would go. If you make the rev band too high and narrow you will never move your relatively heavy car. Of course, the N2O will help with mid range toque, but you are going to have an interesting time bringing it in correctly.

I still advise getting a pro involved, but here's my amatuers $0.02: ~290-295 adv. duration for the intake with 305-310 on the exhaust. Lift around .680-.700. LSA ~110 with 4-6 degrees of advance.

Rich Krause