big cam + small heads
Thread Starter
West South Central Moderator
Joined: Oct 2000
Posts: 3,371
From: Kilgore TX 75662
Originally posted by AdioSS
I was looking at Comp XE lobes 3196 & 3318 with 1.6s on the exhaust on a 115 LSA. I've got an AFR rev kit, Comp R liftters, and won't cheap out on the springs. I want peak power around 6500 and good vacuume with decent gas mileage.
The heads might not flow so great at that much lift, but they are still flowing air. This just means the peak airflow will be reached more. Or maybe that's just how I think of things. I might try 1.5s on the exhaust to get "only" .563" exhaust lift.
I was looking at Comp XE lobes 3196 & 3318 with 1.6s on the exhaust on a 115 LSA. I've got an AFR rev kit, Comp R liftters, and won't cheap out on the springs. I want peak power around 6500 and good vacuume with decent gas mileage.
The heads might not flow so great at that much lift, but they are still flowing air. This just means the peak airflow will be reached more. Or maybe that's just how I think of things. I might try 1.5s on the exhaust to get "only" .563" exhaust lift.
I would've chosen the 3196 lobe for the intake and this one has the milder 3316.
lobe -- adv - .050 - .20 -- lift - - 1.5 - - 1.6
3316 - 288 - 236 - 157 - .347 - .521 - .555
3196 - 288 - 236 - 162 - .390 - .585 - .624
I would've chosen to get it on a 115LSA and this one is on a 114 (not too big of a difference)
I would've chosen to get it ground with Zero advance and this one has 4* advance ground in.
I just don't know... The price is VERY appealing, but hmm... I don't know... My cam would have top end that meas I'd have a better chance of getting the trap speed I want.
This one would be better for around town driving.
Registered User
Joined: Jan 2002
Posts: 348
From: Jonesboro, GA, USA
so, it's an 84 Z28 with a T56 behind a SBC. How big is the motor?
It is a 357.
What's the compression ratio?
~10:1.. iron heads
hydraulic or solid, roller or flat lifters?
hydraulic cam, flat lifters
What's the lobe seperation?
I believe that would be a 110Lsa.. Partly responsible for some of
the drivability issues.
Advanced or retarded valve timing?
Advanced, as to how much I can't remember exactly. The car doesn't
detonate as I believe the cam bleeds off alot of compression.
One more thing, what rear gear ratio and what diameter tires are you running?
245/50/16 right now and 3.42's.. Have had 3.73's.. Not a huge difference
between the 2.. New rear has 4.56's, but haven't had it installed yet.
Not my choice to run 4.56's, because thats what the used rear had in
it I bought.. I will probably try runnin them with a 275/40/17 BFG Drag at
the track until I get some slicks for this car.
As you can see gearing will probably help my probs a bit.. I also just took the
284h cam out in favor of a 274h..Its only a 2-3 hour job to do cam and
lifters.. I figured why not
The 284 was just too much for now until I get some
better heads.
Peace,
It is a 357.
What's the compression ratio?
~10:1.. iron heads
hydraulic or solid, roller or flat lifters?
hydraulic cam, flat lifters
What's the lobe seperation?
I believe that would be a 110Lsa.. Partly responsible for some of
the drivability issues.
Advanced or retarded valve timing?
Advanced, as to how much I can't remember exactly. The car doesn't
detonate as I believe the cam bleeds off alot of compression.
One more thing, what rear gear ratio and what diameter tires are you running?
245/50/16 right now and 3.42's.. Have had 3.73's.. Not a huge difference
between the 2.. New rear has 4.56's, but haven't had it installed yet.
Not my choice to run 4.56's, because thats what the used rear had in
it I bought.. I will probably try runnin them with a 275/40/17 BFG Drag at
the track until I get some slicks for this car.
As you can see gearing will probably help my probs a bit.. I also just took the
284h cam out in favor of a 274h..Its only a 2-3 hour job to do cam and
lifters.. I figured why not
The 284 was just too much for now until I get some better heads.
Peace,
Thread Starter
West South Central Moderator
Joined: Oct 2000
Posts: 3,371
From: Kilgore TX 75662
Originally posted by dist0rtion_69
I run a 240/246 cam on vortec heads that have had a little
work done to them and 2.02 valves. They are protopline 170cc
heads. The cam is .507/.510 or so. The car really needs some
heads, IMO. After feeling the topend pull of my LS1 and comparing
it to this car. It really suffers on drivability at low rpms (which with the
t-56 you will notice) but it feels like it just runs outta breath
past 6k. Don't get me wrong.. it still pulls hard, but it feels like it
reaches a climax at 6k, and just sorta holds steady til 6500-6800.
I run a 240/246 cam on vortec heads that have had a little
work done to them and 2.02 valves. They are protopline 170cc
heads. The cam is .507/.510 or so. The car really needs some
heads, IMO. After feeling the topend pull of my LS1 and comparing
it to this car. It really suffers on drivability at low rpms (which with the
t-56 you will notice) but it feels like it just runs outta breath
past 6k. Don't get me wrong.. it still pulls hard, but it feels like it
reaches a climax at 6k, and just sorta holds steady til 6500-6800.
Originally posted by dist0rtion_69
It is a 357.
~10:1.. iron heads
hydraulic cam, flat lifters
I believe that would be a 110Lsa.. Partly responsible for some of
the drivability issues.
Advanced, as to how much I can't remember exactly. The car doesn't detonate as I believe the cam bleeds off alot of compression.
245/50/16 right now and 3.42's.. Have had 3.73's.. Not a huge difference between the 2.. New rear has 4.56's, but haven't had it installed yet.
Not my choice to run 4.56's, because thats what the used rear had in it I bought.. I will probably try runnin them with a 275/40/17 BFG Drag at the track until I get some slicks for this car.
As you can see gearing will probably help my probs a bit.. I also just took the 284h cam out in favor of a 274h..Its only a 2-3 hour job to do cam and lifters.. I figured why not The 284 was just too much for now until I get some better heads.
It is a 357.
~10:1.. iron heads
hydraulic cam, flat lifters
I believe that would be a 110Lsa.. Partly responsible for some of
the drivability issues.
Advanced, as to how much I can't remember exactly. The car doesn't detonate as I believe the cam bleeds off alot of compression.
245/50/16 right now and 3.42's.. Have had 3.73's.. Not a huge difference between the 2.. New rear has 4.56's, but haven't had it installed yet.
Not my choice to run 4.56's, because thats what the used rear had in it I bought.. I will probably try runnin them with a 275/40/17 BFG Drag at the track until I get some slicks for this car.
As you can see gearing will probably help my probs a bit.. I also just took the 284h cam out in favor of a 274h..Its only a 2-3 hour job to do cam and lifters.. I figured why not
The 284 was just too much for now until I get some better heads.
My case vs yours
383 --- 357 CID
11.5 -- 10.1 CR
alum - iron heads
roller - flat tappet
EFI ---- carb?
I'm interested in seeing how the 4.56s work behind your motor.
Registered User
Joined: Dec 2000
Posts: 568
From: Elkton, Va
I won't run my mouth alot b/c it's been a while since I've posted but I'll say this, "The faster ya go the more it takes". Low end is your friend, if you don't want to spin buy some tires but @ 4100#s you need all the bottom end you can get. Too much camshaft is only going to make drivability suffer, and put your power where you can't use it. I recently discussed this issue with a gentleman concerning the cc306. Very popular, but he said you'll hate it below 4000 R's. Basically it'll make you not like it very much when you drive it.
later,
Vicious
later,
Vicious
Registered User
Joined: Sep 2000
Posts: 550
From: KC; Where grandma drives in the left lane
Originally posted by Vicious95Z28
I won't run my mouth alot b/c it's been a while since I've posted but I'll say this, "The faster ya go the more it takes". Low end is your friend, if you don't want to spin buy some tires but @ 4100#s you need all the bottom end you can get. Too much camshaft is only going to make drivability suffer, and put your power where you can't use it. I recently discussed this issue with a gentleman concerning the cc306. Very popular, but he said you'll hate it below 4000 R's. Basically it'll make you not like it very much when you drive it.
later,
Vicious
I won't run my mouth alot b/c it's been a while since I've posted but I'll say this, "The faster ya go the more it takes". Low end is your friend, if you don't want to spin buy some tires but @ 4100#s you need all the bottom end you can get. Too much camshaft is only going to make drivability suffer, and put your power where you can't use it. I recently discussed this issue with a gentleman concerning the cc306. Very popular, but he said you'll hate it below 4000 R's. Basically it'll make you not like it very much when you drive it.
later,
Vicious
Thread Starter
West South Central Moderator
Joined: Oct 2000
Posts: 3,371
From: Kilgore TX 75662
Originally posted by Vicious95Z28
I won't run my mouth alot b/c it's been a while since I've posted but I'll say this, "The faster ya go the more it takes". Low end is your friend, if you don't want to spin buy some tires but @ 4100#s you need all the bottom end you can get. Too much camshaft is only going to make drivability suffer, and put your power where you can't use it. I recently discussed this issue with a gentleman concerning the cc306. Very popular, but he said you'll hate it below 4000 R's. Basically it'll make you not like it very much when you drive it.
later,
Vicious
I won't run my mouth alot b/c it's been a while since I've posted but I'll say this, "The faster ya go the more it takes". Low end is your friend, if you don't want to spin buy some tires but @ 4100#s you need all the bottom end you can get. Too much camshaft is only going to make drivability suffer, and put your power where you can't use it. I recently discussed this issue with a gentleman concerning the cc306. Very popular, but he said you'll hate it below 4000 R's. Basically it'll make you not like it very much when you drive it.
later,
Vicious
Others have gone with cams of similar size in smaller engines and loved them! Yes, my car is heavy and needs torque to go, but why not move the torque band to the right where I can also pick up horsepower?
Assuming the only changes to an engine are the duration specs (same LSA, same lift, same everything else in the engine) it should be able to put out X peak torque, right? What's wrong in moving that torque peak up and gaining horsepower at the same time?
If you are right about this being too much cam, then I'll put 4.56 gears in the big boat
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