Cam question
Thread Starter
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
Cam question Right now i have a 230/236 510/520 112lsa XE cam in my 383 below. I feel like this is kinda a baby cam for this stroker, and i want to throw a bigger one in there this winter. Question is, since the valvetrain is already set up for this cam, i should be all set to throw a bigger one in there right? This is what i've got:
CC 1.6 NSA RR's 7/16" stud
CC 1.430" diameter double springs (#987)
CC 10 degree titanium retainers and locks
CC Chromoly 7.200" pushrods
So i should be set to just throw another cam in there right? Any cam suggestions? I will also be doing 42# injectors, 58mm tb and a new tune from PCMfor less. Then in the spring, a dyno tune.
CC 1.6 NSA RR's 7/16" stud
CC 1.430" diameter double springs (#987)
CC 10 degree titanium retainers and locks
CC Chromoly 7.200" pushrods
So i should be set to just throw another cam in there right? Any cam suggestions? I will also be doing 42# injectors, 58mm tb and a new tune from PCMfor less. Then in the spring, a dyno tune.
Ha....I'm in the exact same boat, with same exact build. I think you would be fine just double check the valve spring ratings to your potential cam specs. I need to do the same on mine on my springs which I don't the brand ext. If anyone knows how to check them on the motor without the removal of the heads feel free to chim in. don't mean to hijack your thread
i haven't picked the exact cam yet but I plan on goin with something around 242/246 .59 110 LSA or so with a 3500 stall
i haven't picked the exact cam yet but I plan on goin with something around 242/246 .59 110 LSA or so with a 3500 stall
Right now i have a 230/236 510/520 112lsa XE cam in my 383 below. I feel like this is kinda a baby cam for this stroker, and i want to throw a bigger one in there this winter. Question is, since the valvetrain is already set up for this cam, i should be all set to throw a bigger one in there right? This is what i've got:
CC 1.6 NSA RR's 7/16" stud
CC 1.430" diameter double springs (#987)
CC 10 degree titanium retainers and locks
CC Chromoly 7.200" pushrods
So i should be set to just throw another cam in there right? Any cam suggestions? I will also be doing 42# injectors, 58mm tb and a new tune from PCMfor less. Then in the spring, a dyno tune.
CC 1.6 NSA RR's 7/16" stud
CC 1.430" diameter double springs (#987)
CC 10 degree titanium retainers and locks
CC Chromoly 7.200" pushrods
So i should be set to just throw another cam in there right? Any cam suggestions? I will also be doing 42# injectors, 58mm tb and a new tune from PCMfor less. Then in the spring, a dyno tune.
The next camshaft that you may put in there may not have the same base circle size which would throw the pushrod geometry off so at the very least you will have to measure the correct pushrod length to make sure the geometry is still on.
Thread Starter
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
no im pretty sure those cam specs are with 1.6rrs
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Thread Starter
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
all i know is a 510/520 lift cam is NOT big enough to get enough air through those heads. I was looking at a 575/575 or so cam instead.
how is that 108lsa with surge and driveability? are you an a4 or m6?
also how do i tell if my pushrods are the right length?
how is that 108lsa with surge and driveability? are you an a4 or m6?
also how do i tell if my pushrods are the right length?
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Verdad Gallardo I have a 107lsa cam with my A4 and it drives beautifully.
Thread Starter
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
TECH Regular
Joined: Feb 2008
Posts: 458
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From: Keller, Texas
Nice valvetrain. Investing in titanium retainers and locks is an important insurance for an aggressive cam with a hard ramp rate.
I agree you need a cam with higher lift than your current cam.
Call up Mr. LE, he will hook u up.
I agree you need a cam with higher lift than your current cam.
Call up Mr. LE, he will hook u up.
limiting factor on cam will be the springs you currently have.
If you upgrade to some Patriot Gold Extreme springs, you can pretty much use what ever hyd roller cam you want with out worries.
The cam that you have will definitely feel pretty small in a 383.
Lloyd
If you upgrade to some Patriot Gold Extreme springs, you can pretty much use what ever hyd roller cam you want with out worries.
The cam that you have will definitely feel pretty small in a 383.
Lloyd
Thread Starter
Joined: Feb 2008
Posts: 1,265
Likes: 18
From: Bolton Masshole
ive looked online and can't seem to find the info i need. anyone know what lift the 987 valvsprings are good up to? I seem to remember its .600 but i want to be sure
A good hyd roller needs 145 lbs of seat pressure and up to 155 lbs if you have steel retainers and want to spin 6500 RPM with out valve trane problems.
Even set up at 1.750, the 987 has 138 lbs of seat pressure and coil binds at 1.150 so it coil binds at .600 lift and you want .030-.040 or so before coil bind to be safe. This keeps you at a .570 limit for being "safe".
FWIW, the 987 is also rated as a .500 lift spring in the Comp catalog. .520+ lift, you can get a better spring in the same price range like the Crane 99893, K Motion K-800 springs, etc that will handle more lift and have more seat/open pressure.
If you have the 987's and do not know the set up ht or if they are set up at a taller installed ht (1.800, 1.850, etc) you have less pressure and are VERY limited on cam selection.
Lloyd
Even set up at 1.750, the 987 has 138 lbs of seat pressure and coil binds at 1.150 so it coil binds at .600 lift and you want .030-.040 or so before coil bind to be safe. This keeps you at a .570 limit for being "safe".
FWIW, the 987 is also rated as a .500 lift spring in the Comp catalog. .520+ lift, you can get a better spring in the same price range like the Crane 99893, K Motion K-800 springs, etc that will handle more lift and have more seat/open pressure.
If you have the 987's and do not know the set up ht or if they are set up at a taller installed ht (1.800, 1.850, etc) you have less pressure and are VERY limited on cam selection.
Lloyd
MTBsully Just call Lloyd. He'll set you up right!!! He can set you up with springs and grind you a custom cam for you application!
I thought that cam looked tiny for 1.6 rockers. 544/555 is alittle better but still small for your car.
I thought that cam looked tiny for 1.6 rockers. 544/555 is alittle better but still small for your car.
