cam gurus please step in....
cam gurus please step in.... needing a a cam to go with my new build. only thing let to pick is the cam. going off the new summit racing stg1 ghost cam i have changed a few specs but not sure which is best to go with or should i just keep the same specs they sell. this is for a 4th gen camaro with ls1 and t56.
needs-
car MUST take off from a dead stop like its stock. no bucking or wanting to stall or a hint of anything at low speeds. also a nice chop at idle and have GOOD low end power. from lets say 1500-6500rpms. has to pull well, something that rip the tires off the rim off idle and can also pull well on a highway run. would like to make 450rwhp+.
heads-
SPS cnc ported 243 heads. milled .030
.040 headgasket (questionable). depending how much compression we can run and still make sure everything will clear and be 93oct safe
intake/tb-
FAST 102mm intake fully ported by SPS and port matched to the heads
WARR 102mm TB port matched by SPS to the intake
exhaust-
speed engineering long tube headers 1-7/8s and hooker blackheart true duals (catless)
other-
25% underdrive pulley
----------------------------------------------------------------------------------------------------------------------
now the off the shelf summit stg 1 specs are 222/233 .600/.575 115+3
the few changes i have made to maybe suit my needs better but not sure. just guessing here.
1- 222/233 .600/.575 114+3
2- 222/233 .600/.575 113+3
4- 222/233 .600/.600 114+3
5- 222/233 .600/.600 113+3
i know these are very small changes but im not cam person. just ideas from other cams iv looked at and also taking my wants into account.
would like to know everyone's opinion and suggestions.
needs-
car MUST take off from a dead stop like its stock. no bucking or wanting to stall or a hint of anything at low speeds. also a nice chop at idle and have GOOD low end power. from lets say 1500-6500rpms. has to pull well, something that rip the tires off the rim off idle and can also pull well on a highway run. would like to make 450rwhp+.
heads-
SPS cnc ported 243 heads. milled .030
.040 headgasket (questionable). depending how much compression we can run and still make sure everything will clear and be 93oct safe
intake/tb-
FAST 102mm intake fully ported by SPS and port matched to the heads
WARR 102mm TB port matched by SPS to the intake
exhaust-
speed engineering long tube headers 1-7/8s and hooker blackheart true duals (catless)
other-
25% underdrive pulley
----------------------------------------------------------------------------------------------------------------------
now the off the shelf summit stg 1 specs are 222/233 .600/.575 115+3
the few changes i have made to maybe suit my needs better but not sure. just guessing here.
1- 222/233 .600/.575 114+3
2- 222/233 .600/.575 113+3
4- 222/233 .600/.600 114+3
5- 222/233 .600/.600 113+3
i know these are very small changes but im not cam person. just ideas from other cams iv looked at and also taking my wants into account.
would like to know everyone's opinion and suggestions.
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,615
From: Central Cal.
.025 more exhaust lift is not going to make much difference power-wise here. In fact the reason Summit's cam engineer went with this lift spec is to encourage a bit more velocity thru the exhaust valve, which would be compromised some if brought up to .600. Also, cutting the LSA a degree will make it idle just a bit rougher and give it just a touch less off-idle power.
.025 more exhaust lift is not going to make much difference power-wise here. In fact the reason Summit's cam engineer went with this lift spec is to encourage a bit more velocity thru the exhaust valve, which would be compromised some if brought up to .600. Also, cutting the LSA a degree will make it idle just a bit rougher and give it just a touch less off-idle power.
TECH Senior Member
Joined: Jun 2016
Posts: 22,291
Likes: 3,615
From: Central Cal.
OK, looks like you do know what you're up against. Good luck with your build!
Not a cam guru, but on your headgaskets if you're iffy on the .040 and want something in the middle check out the .045 from WS6store, they are less than half the price of .040 cometics too.
I'm not yo worried about that. But I will keep those in mind when buying gaskets. Just need to figure out this cam first.
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he has my heads just about done. starting the intake and tb when everything gets there.
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Verdad Gallardo What rear gear will the car have stock 3.42's or 3.73's or 4.10's?
Gears really help with drive ability and bottom end. That can help open up cam choices.
The Summit 222/233 Ghost Cam or similar seems to be an excellent cam. However for more power other Summit cam looks good too the ~227/235 is sized one. With a 346 cube engine the 227ish duration intake is about the max before torque starts shifting to the right.
There are a lot of excellent ~227/235 is cams to consider too. I'd want 4.10's in any T56 car even a bolt on car. It's probably the most rewarding fun to drive mod for a T56 car other an aftermarket shifter and skip shift elimination.
Gears really help with drive ability and bottom end. That can help open up cam choices.
The Summit 222/233 Ghost Cam or similar seems to be an excellent cam. However for more power other Summit cam looks good too the ~227/235 is sized one. With a 346 cube engine the 227ish duration intake is about the max before torque starts shifting to the right.
There are a lot of excellent ~227/235 is cams to consider too. I'd want 4.10's in any T56 car even a bolt on car. It's probably the most rewarding fun to drive mod for a T56 car other an aftermarket shifter and skip shift elimination.
With your bump in compression plus ported heads I would go with 228/232ish cam. Ive run several 228/232's on 110 with zero drive ability issues and it will rip the tires off from idle. My old drift car would do it from idle on 315 DR's with the 3.42 and I drove it daily in Atlanta traffic. As long as your tuner knows what he's doing even something like a T-rex cam in a stock 346 will not buck and chug.
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Remember, stick the duration/lobe separation/advance into the calculator and it will tell you what's going to happen.
