Cam question for cam-smart people...
12-01-2010, 10:11 AM
#1
Cam question for cam-smart people... I keep flying back and forth on cam selection. Most days i want a CC503 cam with 1.6RR
As we know the CC503 224/230 .537/.544 112lsa
Some people do like to run the CC306 on stock heads and as we know its a 230/244 .544/.576 112lsa. Ive ran this cam befor.
Then we get to the Crane 227 cam, Said to be the record holder, yet i cant seem to find anywhere what that record was
. Its a small cam, not meant to be revved to 6300rpm to make power. Known for low end torque. The thing that worries me about the crane 227 is what will be left on the table.
So the 227 as we know is 210/224 .511/.553 112lsa.
Adding 1.65 rocker arms takes the crane 227 up to a .527/.570 lift. Now the CC306 with its .544/.576 lift, we know maxes out basically a stock headed LT1. The cc503 sits at .553/.561 when you add 1.65 rockers, also a very nice number.
The cc503 - "When I bumped the shifts up to where they wanted to be (6300ish) I picked up .4 and 4 mph in the quarter mile" So that cam still does need to be revved relatively high to get the most out of it.
So my 1st question is, is it lift or duration that is going to put my power band into place. Im thinking if i can keep the power below a 6300rpm shift point, i can maximize my engine life. The crane 227 is known for not needing to be revved high, but its also known for being a small cam.
MY 2nd question is...is it lift or duration that maxes out the stock cyl head flow making the CC306 one of the largest cams you should consider running.
The 227 may not rev as high as the 503, but if it makes more useable power faster then the 503 and at a lower rpm, then i may go with it. Im sure it will still breath up at 6000rpm right?
And my last question would be, is using 1.7 rockers with the crane 227 or the 503 on stock heads a good thing or a bad thing. That would put the 227 up to .543/.587 (which is closer to the lift of the cc306 on 1.6 rockers). and the cc503 up to a .570/.578.
Honestly the Crane 227 looks like a better cam once you start adding 1.65 or 1.7 rockers. But is it to much? The duration is alot smaller then the cc306 so im just wondering how it would all react with the high lift numbers. a .527/.570 cam sounds like an almost perfect mix (lift wise) between the cc503/cc306/crane 227 and when the goals are not to rev to 6300rpm, it comes out smelling pretty good.
If you made it through all that, all replys and input are welcomed!
As we know the CC503 224/230 .537/.544 112lsa
Some people do like to run the CC306 on stock heads and as we know its a 230/244 .544/.576 112lsa. Ive ran this cam befor.
Then we get to the Crane 227 cam, Said to be the record holder, yet i cant seem to find anywhere what that record was
. Its a small cam, not meant to be revved to 6300rpm to make power. Known for low end torque. The thing that worries me about the crane 227 is what will be left on the table.So the 227 as we know is 210/224 .511/.553 112lsa.
Adding 1.65 rocker arms takes the crane 227 up to a .527/.570 lift. Now the CC306 with its .544/.576 lift, we know maxes out basically a stock headed LT1. The cc503 sits at .553/.561 when you add 1.65 rockers, also a very nice number.
The cc503 - "When I bumped the shifts up to where they wanted to be (6300ish) I picked up .4 and 4 mph in the quarter mile" So that cam still does need to be revved relatively high to get the most out of it.
So my 1st question is, is it lift or duration that is going to put my power band into place. Im thinking if i can keep the power below a 6300rpm shift point, i can maximize my engine life. The crane 227 is known for not needing to be revved high, but its also known for being a small cam.
MY 2nd question is...is it lift or duration that maxes out the stock cyl head flow making the CC306 one of the largest cams you should consider running.
The 227 may not rev as high as the 503, but if it makes more useable power faster then the 503 and at a lower rpm, then i may go with it. Im sure it will still breath up at 6000rpm right?
And my last question would be, is using 1.7 rockers with the crane 227 or the 503 on stock heads a good thing or a bad thing. That would put the 227 up to .543/.587 (which is closer to the lift of the cc306 on 1.6 rockers). and the cc503 up to a .570/.578.
Honestly the Crane 227 looks like a better cam once you start adding 1.65 or 1.7 rockers. But is it to much? The duration is alot smaller then the cc306 so im just wondering how it would all react with the high lift numbers. a .527/.570 cam sounds like an almost perfect mix (lift wise) between the cc503/cc306/crane 227 and when the goals are not to rev to 6300rpm, it comes out smelling pretty good.
If you made it through all that, all replys and input are welcomed!
Last edited by trilkb; 12-01-2010 at 10:21 AM.
12-01-2010, 11:26 AM
#2
ideally you machine iron heads for screw in studs. some have run 227 with 1:6 all around without issues...some have experienced pulling up rr stud on exhaust side with 1:6.
FWIW I like the 227 on a stock motor and is what I am doing on a 355 rebuild but machineing the iron heads for screw in studs
12-01-2010, 12:01 PM
#5
well what im generally asking is will the Crane 227 with 1.65 rockers doing .527/.570 lift numbers still drive like a 227 with 1.6 rockers or will the power band change alot? the goal is guess is to just not have to rev the motor high to make power. And would the crane 227 make more useable power with 1.65 rockers then a cc503 car with 1.6 rockers.
12-01-2010, 01:19 PM
#7
From what I've seen ALL cam only LT1s can and typically do dyno about the same. It just depends on the rest of the car.
Stick with the cheaper of the 2 cams you find. Even the "too big for stock heads" cams still dyno about the same, just with a narrower powerband that can be adjusted for. In that way, I'd stay away from the 306 unless you have an M6 especially if you want to keep the RPMs lower.
They even all pretty much trap the same when set up correctly too.
That's the most important part. The car needs to be set up to run that specific cam. If you don't set it up to the specific cam you won't see good results.
What you seem to be worried about is a difference of maybe 1-3 hp and if that's the case then an old shelf cam is not the place to look.
Stick with the cheaper of the 2 cams you find. Even the "too big for stock heads" cams still dyno about the same, just with a narrower powerband that can be adjusted for. In that way, I'd stay away from the 306 unless you have an M6 especially if you want to keep the RPMs lower.
They even all pretty much trap the same when set up correctly too.
That's the most important part. The car needs to be set up to run that specific cam. If you don't set it up to the specific cam you won't see good results.
What you seem to be worried about is a difference of maybe 1-3 hp and if that's the case then an old shelf cam is not the place to look.
