GrabberBlue5.0
Gold Member
So on a street driven DD higher lift is the better way to go?
Dirt cheap Coyote cams
- Thread starter kdanner
- Start date
In my understanding, and I could be wrong....
The more lift is good for a broad power band and good torque. The more duration, the power band shifts higher in the RPM. It creates more scavaging and therefore better high rpm power.
::EDIT::
And of course combining the two and having a higher lift and longer duration cams will result in better power throughout. But you can have too much of both and hurt the gains as well.
That's how I always knew it. Please correct me or add anything.
The more lift is good for a broad power band and good torque. The more duration, the power band shifts higher in the RPM. It creates more scavaging and therefore better high rpm power.
::EDIT::
And of course combining the two and having a higher lift and longer duration cams will result in better power throughout. But you can have too much of both and hurt the gains as well.
That's how I always knew it. Please correct me or add anything.
Last edited:
JEWC_Motorsports
S197 Junkie
On my NA beast we are doing the longer duration cams. Im not scared of revving the piss out of it.
joeymustang
Member
higher rpms = new oil pump gears too.
JEWC_Motorsports
S197 Junkie
smoken1986
Member
What about the valve springs on these? I know jegs has a kit with springs and cams (exhaust only) for $212 and if springs are needed can they be done with the heads on? But the ones I was looking at where the stock lift 290 duration ones, has anyone used the stock gt springs with these?
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SSPSTANGBANGER
LSx Slayer
Mine has seen 2k miles of 7,900rpm abuse with stock oil pump gears and not missed a lick! N/A I don't see it being a issue.
Sent from my iPhone 5S
Bullitt 3309
Senior Member
I swapped to the boss springs when doing my exhaust cams since I was doing the CJ swap as well and wanted to be able to rev it past 7500 to get the benefit of the intake. All work can be done with heads one, will need a spring compressor tool if swapping springs. Freedom Racing is where I got mine.
Bullitt 3309
Senior Member
I am not taking that risk. Since I had the front cover off for cam/spring swap, oil pump gears was another 5 minute step.
smoken1986
Member
Thanks, just ordered a set from Jegs with the springs. Plan on doing the oil pump gears, cams, springs, and a boss intake all at the same time.
UltraKla$$ic
PERENNIAL WAXXER
Is it just these 2 spots on both heads that need clearancing on the exhaust side of the head?
Clearancing GT heads for Boss Exhaust cams
Clearancing GT heads for Boss Exhaust cams
Not to get flamed on this one, but has anyone seen this from MMR, and what are your guy's thoughts? Since we are talking about oil gears.
http://www.svtperformance.com/forum...-engine!!-The-problem-and-the-fix-gt-gt-gt-gt
SStang.
http://www.svtperformance.com/forum...-engine!!-The-problem-and-the-fix-gt-gt-gt-gt
SStang.
Bullitt 3309
Senior Member
For the piece of mind if it was available when I did my swap I would have installed them as well...
Bullitt 3309
Senior Member
I would recommend using Blazers guide here:
http://www.s197forum.com/forum/showthread.php?t=111176&highlight=pump
And I would also recommend a Helm subscription as well. I used both to get mine done.
ebrow21
Member
My 2/12 built 12 GT has the clearance AND oil squirter deletes already built in. They're already cut as the pictures show in your link. I'll have to get the pictures from my Ipad.
Now that I know that, I'm thinking I'm going to buy the boss intake cams as well......have to call the machine shop!
Bud
Senior Member
Seems some aftermarket cams are quite a bit heavier than stock ford cams which has to be harder on parts. Also curious if the ramp rate on the 13mm/263 cams would cause more stress on the chains, sprocket, and springs making the stronger piece by MMR a good idea, especially when boosted with lots of cylinder pressure.
I'm pretty dumb when it comes to this stuff but good to hear other's thoughts/experience. I'm giving the 11mm/290 exhaust cams a try in my car with stock intake cams. I am running limiters but hopefully still enough variable left that we can play with overlap if needed. Seems single/twin/backpressure/etc all impacts what is a good cam choice for turbo cars. Pain to change if the car doesn't like the cams, but at $150 I had to give them a try and see.
rcm90
Senior Member
Can you either post or pm me results vs. stock cams? I'm not sure what exhaust cam im wanting to use for my turbo combo.
Bud
Senior Member
I'm not going to have specifics unfortunately. Never really dyno'd the car. Also the 8.30 run was with about 10.75 compression and the 60mm magnums. Came out about 10.4 compression on this build and has 6266 precisions now. Also changed the converter while the motor was out. Hoping for a little better ring seal with the darton sleeves as opposed to the stock sleeves as well.
Now that I think about it, I'm probably going to have no clue if the cams hurt/help. I should know better than to make that many changes at once.
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