solid roller cam help please
solid roller cam help please ok i have a 396 stroker with trickflow heads ported out, intake ported. the engine guy said something about a solid roller cam 261/273 at50 688/688 lift 107 lsa. that sounds small cam for that motor. i am running stock pcm so i want to shift around 6800-7000. i have a 4400 stall. flow numbers on the heads were 304 at 700'. i also want to spray a 250 -300 shot. with the cam on a 107 lsa that will only be good to 100-150 shot before it stops making more power on the nitrous? please list some of your numbers or any info would be great, thanks.
If you think that cam sounds small I would ask if you understand the difference between advertised duration and .050 duration.
Far as LSA and that large a nitrous shot, typically yeah you want a wider LSA with that big a shot BUT I would counter with what kind of performance are you looking for?
If the Chassis and motor are decent a 150shot get you DEEP into the 9s.
Far as LSA and that large a nitrous shot, typically yeah you want a wider LSA with that big a shot BUT I would counter with what kind of performance are you looking for?
If the Chassis and motor are decent a 150shot get you DEEP into the 9s.
That is not what I would call a small cam. With the right heads and intake that cam will make 650hp on a 396 on motor.
Don't see too many 27x exh durations on LT1s - make sure you check PTV VERY CAREFULLY and multiple times during assembly. Of course it depends on your valve open/close timings but my exhaust valve hit with almost 10* less exhaust duration and my intake valve was at the bare minimum. Had to have the pistons flycut.
With a 250+ shot you probably want a cam with less overlap and a wider LSA so you're not blowing the nitrous out the exhaust. Like stated though, with that cam on a 396 and good heads even a 150 shot is going to be a handful.
Don't see too many 27x exh durations on LT1s - make sure you check PTV VERY CAREFULLY and multiple times during assembly. Of course it depends on your valve open/close timings but my exhaust valve hit with almost 10* less exhaust duration and my intake valve was at the bare minimum. Had to have the pistons flycut.
With a 250+ shot you probably want a cam with less overlap and a wider LSA so you're not blowing the nitrous out the exhaust. Like stated though, with that cam on a 396 and good heads even a 150 shot is going to be a handful.
You won't be able to utilize peak power with that cam on a stock PCM. Better to go smaller if you want to go solid roller. I had a Cam Motion 248/250 .650/.610 on a 112lsa and it peaked at 6800rpm. Was perfect for a stock PCM. If my heads were more opened up it would have peaked and plateaued well over the stock rev limit.
Not every cylinder head is the same, especially on something that has already been modified. That flow sheet (provided it's a comprehensive one and not just numbers at lift) will tell you exactly what those heads are doing. Considering this is a customized build, why would you guess on something so critical like the camshaft? You're leaving a lot on the table that way, particularly on a motor that's designed for running the pill. If you're paying for a cam and have all the necessary information to get it right, it's silly NOT to use that information when it's readily available and he's getting a new cam in the first place.
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thanks for the comments guys. i have never ran a solid cam before. some of my friends were over and said thats a small cam, i thought they were nuts, but never running one before i didnt know for sure. yes the engine buider did my heads and has the flow sheet. i am running a stock pcm for now. if i can make a better et on motor and spray less im all for it. comperssion will be 13.1-13.5 with diamond pistons. hope i dont have to have the fly cut. i will be running e85. thanks for all the help i have alot to learn about solid roller set ups. thanks
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Verdad Gallardo thanks for the comments guys. i have never ran a solid cam before. some of my friends were over and said thats a small cam, i thought they were nuts, but never running one before i didnt know for sure. yes the engine buider did my heads and has the flow sheet. i am running a stock pcm for now. if i can make a better et on motor and spray less im all for it. comperssion will be 13.1-13.5 with diamond pistons. hope i dont have to have the fly cut. i will be running e85. thanks for all the help i have alot to learn about solid roller set ups. thanks
LT1s turn more rpm for a given duration due to the ultra short runner intake. Maybe that is why they thought the cam was "small".
DeltaElite121, the direction I was going is maybe he does NOT need to buy a new cam and should try what he has first.
Flow benches vary so dramatically that they really shouldn't be discussed much but just left as a shop tool. Any good cam guy familiar with the engine type and basics of the cylinder head/intake will be able to spec a cam. If a head plateaus at .630 or .660 it really isn't going to change the cam they are going to spec unless going very high end and having someone develop lobes for you.
What kind of ETs are you chasing, if high 9s are it I would run the cam as is with 100-150shot and see how it does.
That said there is a guy around here running mid 9s on ported LT1 heads, carbed intake and I think a GMPP 847 cam which is hydraulic around 230degrees of duration all on a stock shortblock with some nitrous.
Point being a 300shot on a solid roller 396 if dialed in with a lite car could probably do 8s.
Probably a bit beyond what you were looking for.
DeltaElite121, the direction I was going is maybe he does NOT need to buy a new cam and should try what he has first.
Flow benches vary so dramatically that they really shouldn't be discussed much but just left as a shop tool. Any good cam guy familiar with the engine type and basics of the cylinder head/intake will be able to spec a cam. If a head plateaus at .630 or .660 it really isn't going to change the cam they are going to spec unless going very high end and having someone develop lobes for you.
What kind of ETs are you chasing, if high 9s are it I would run the cam as is with 100-150shot and see how it does.
That said there is a guy around here running mid 9s on ported LT1 heads, carbed intake and I think a GMPP 847 cam which is hydraulic around 230degrees of duration all on a stock shortblock with some nitrous.
Point being a 300shot on a solid roller 396 if dialed in with a lite car could probably do 8s.
Probably a bit beyond what you were looking for.
yea my car is light, 3300 with me in it. not looking for 8 ,but its kinda like nitrous you start with 100 shot then it gets old so you up it. who knows maybe one day i will want to go 8. 10 on motor, 9 on spray. i am doing a full suspension front to rear. what all that power good for if you just spin and cant hook. you see 1000 hp cars getting killed by 500 hp car that 60' like hell
First off have you ever even had a 12 second car, saying that cam is small because your friends said so already tells me you know very little to nothing on a performance stand point. I get people that tell me a bone stock LS car is "Scary Fast" then say, I want 1000 HP...I think you better regroup and realize what it takes to get into just the 10 sec zone, 96 is correct..
First off have you ever even had a 12 second car, saying that cam is small because your friends said so already tells me you know very little to nothing on a performance stand point. I get people that tell me a bone stock LS car is "Scary Fast" then say, I want 1000 HP...I think you better regroup and realize what it takes to get into just the 10 sec zone, 96 is correct..
Well then obviously you have others build your motor, the "because my friend told me so"' just states your not sure of a performance build, I was trying to educate you that it takes more than you realize to get into the 10"s and you call me. Jack ***. You kiddo are the jack ***!
OP, you have some of the best experience LT1 members trying to guide you in the right direction here…moehorsepower,96capricemgr,Puck, just to name a few. I would suggest listening, and do more searching for what you want or trying to do.
As for that cam being too small, theres plenty of LT1's running in 8's on a much smaller cam! SEARCH is your friend.
As for that cam being too small, theres plenty of LT1's running in 8's on a much smaller cam! SEARCH is your friend.
