Question about a cam swap
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 570
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From: TEXAS
Car: 1987 IROC-Z
Engine: 6.2L
Transmission: Stage III T56
Axle/Gears: 3.73
Question about a cam swap
If my motor currently has a Crane 2030 and Im wanting to go to a Xtreme Energy COMP Cams, 230 intake-exhaust 244 Part number- 08-306-08
other than the cam itself, what should be purchased to make this cam work?
other than the cam itself, what should be purchased to make this cam work?
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 570
Likes: 69
From: TEXAS
Car: 1987 IROC-Z
Engine: 6.2L
Transmission: Stage III T56
Axle/Gears: 3.73
Supreme Member
Joined: Dec 2005
Posts: 9,919
Likes: 885
From: 53.0907° N, 113.4695° W
Re: Question about a cam swap
Well, that depends.
This is assuming that you'll be re-using your factory hydraulic lifters which will carry you to somewhere around 5500-6000 before the lifters start to give up. (Yes, it's true)
If you want the minimum amount of expense then choosing a spring that'll drop into your Iron Eagle heads should allow you to reuse your retainers. You'll have to investigate that to be sure they would be interchangable. I wouldn't re-use the keepers but in a pinch, you could.
If you want to step up to a much better spring, especially for a hydraulic roller, then a change to one of the bee-hive springs is a good move. Something along the lines of the Comp Cams 26915 or 26918. If you go into the Comp catalog, they're probably listed as one of the springs of choice for that cam. With the beehive spring comes new retainers due to the springs unique design.
If you want to be very thorough, examine what the desired compression ratio should be for the new cam. It may mean a bump in your SCR to help the cam work as it should. A head gasket could accomplish this very easily. If you post the specs of both cams, (advertised duration, duration at .050", lobe centreline angle and intake centreline angle) then a calculation is easily done. Include your other engine specs if you know them. Piston type, any machine work done like decking, etc.
A new timing chain is also a cheap investment.
Now, chances are you'll find out that there are as many opinions on how you might go about this as there are people that offer to advise you.
I'm just one of them.
This is assuming that you'll be re-using your factory hydraulic lifters which will carry you to somewhere around 5500-6000 before the lifters start to give up. (Yes, it's true)
If you want the minimum amount of expense then choosing a spring that'll drop into your Iron Eagle heads should allow you to reuse your retainers. You'll have to investigate that to be sure they would be interchangable. I wouldn't re-use the keepers but in a pinch, you could.
If you want to step up to a much better spring, especially for a hydraulic roller, then a change to one of the bee-hive springs is a good move. Something along the lines of the Comp Cams 26915 or 26918. If you go into the Comp catalog, they're probably listed as one of the springs of choice for that cam. With the beehive spring comes new retainers due to the springs unique design.
If you want to be very thorough, examine what the desired compression ratio should be for the new cam. It may mean a bump in your SCR to help the cam work as it should. A head gasket could accomplish this very easily. If you post the specs of both cams, (advertised duration, duration at .050", lobe centreline angle and intake centreline angle) then a calculation is easily done. Include your other engine specs if you know them. Piston type, any machine work done like decking, etc.
A new timing chain is also a cheap investment.
Now, chances are you'll find out that there are as many opinions on how you might go about this as there are people that offer to advise you.
I'm just one of them.
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 570
Likes: 69
From: TEXAS
Car: 1987 IROC-Z
Engine: 6.2L
Transmission: Stage III T56
Axle/Gears: 3.73
Re: Question about a cam swap
Well, that depends.
This is assuming that you'll be re-using your factory hydraulic lifters which will carry you to somewhere around 5500-6000 before the lifters start to give up. (Yes, it's true)
If you want the minimum amount of expense then choosing a spring that'll drop into your Iron Eagle heads should allow you to reuse your retainers. You'll have to investigate that to be sure they would be interchangable. I wouldn't re-use the keepers but in a pinch, you could.
If you want to step up to a much better spring, especially for a hydraulic roller, then a change to one of the bee-hive springs is a good move. Something along the lines of the Comp Cams 26915 or 26918. If you go into the Comp catalog, they're probably listed as one of the springs of choice for that cam. With the beehive spring comes new retainers due to the springs unique design.
If you want to be very thorough, examine what the desired compression ratio should be for the new cam. It may mean a bump in your SCR to help the cam work as it should. A head gasket could accomplish this very easily. If you post the specs of both cams, (advertised duration, duration at .050", lobe centreline angle and intake centreline angle) then a calculation is easily done. Include your other engine specs if you know them. Piston type, any machine work done like decking, etc.
A new timing chain is also a cheap investment.
Now, chances are you'll find out that there are as many opinions on how you might go about this as there are people that offer to advise you.
I'm just one of them.
This is assuming that you'll be re-using your factory hydraulic lifters which will carry you to somewhere around 5500-6000 before the lifters start to give up. (Yes, it's true)
If you want the minimum amount of expense then choosing a spring that'll drop into your Iron Eagle heads should allow you to reuse your retainers. You'll have to investigate that to be sure they would be interchangable. I wouldn't re-use the keepers but in a pinch, you could.
If you want to step up to a much better spring, especially for a hydraulic roller, then a change to one of the bee-hive springs is a good move. Something along the lines of the Comp Cams 26915 or 26918. If you go into the Comp catalog, they're probably listed as one of the springs of choice for that cam. With the beehive spring comes new retainers due to the springs unique design.
If you want to be very thorough, examine what the desired compression ratio should be for the new cam. It may mean a bump in your SCR to help the cam work as it should. A head gasket could accomplish this very easily. If you post the specs of both cams, (advertised duration, duration at .050", lobe centreline angle and intake centreline angle) then a calculation is easily done. Include your other engine specs if you know them. Piston type, any machine work done like decking, etc.
A new timing chain is also a cheap investment.
Now, chances are you'll find out that there are as many opinions on how you might go about this as there are people that offer to advise you.
I'm just one of them.
My engine has 1.6 roller rockers, Dart Iron Eagle SS heads, (5.7L) Crane 2030 came is 216/220 with 112 lobe sep
EXTREME Energy COMP cam, 230/244 with 112 lobe sep all of this is at .050
My rockers just went in like 2,000 miles ago and had new springs or retainers (I forget) put in. Seems like they went with new valves when the heads went on and the heads went on at the same time
Supreme Member
Joined: Dec 2005
Posts: 9,919
Likes: 885
From: 53.0907° N, 113.4695° W
Re: Question about a cam swap
Looking at your signature, I see forged pistons. Do you know anything about them?
I'm asking because to accurately calculate the static compression ratio the following is required.
Bore/stroke
Combustion chamber volume
Piston valve pocket relief or dome volume
Piston position relative to the deck
Head gasket thickness and bore diameter
To calculate the dynamic or running compression ratio, to the above list the specs for: connecting rod length, advertised cam duration, ICL and LSA are needed.
Although we can speculate on some of these values, the more accurate the information, the better the results.
I'm asking because to accurately calculate the static compression ratio the following is required.
Bore/stroke
Combustion chamber volume
Piston valve pocket relief or dome volume
Piston position relative to the deck
Head gasket thickness and bore diameter
To calculate the dynamic or running compression ratio, to the above list the specs for: connecting rod length, advertised cam duration, ICL and LSA are needed.
Although we can speculate on some of these values, the more accurate the information, the better the results.
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 570
Likes: 69
From: TEXAS
Car: 1987 IROC-Z
Engine: 6.2L
Transmission: Stage III T56
Axle/Gears: 3.73
Re: Question about a cam swap
Looking at your signature, I see forged pistons. Do you know anything about them?
I'm asking because to accurately calculate the static compression ratio the following is required.
Bore/stroke
Combustion chamber volume
Piston valve pocket relief or dome volume
Piston position relative to the deck
Head gasket thickness and bore diameter
To calculate the dynamic or running compression ratio, to the above list the specs for: connecting rod length, advertised cam duration, ICL and LSA are needed.
Although we can speculate on some of these values, the more accurate the information, the better the results.
I'm asking because to accurately calculate the static compression ratio the following is required.
Bore/stroke
Combustion chamber volume
Piston valve pocket relief or dome volume
Piston position relative to the deck
Head gasket thickness and bore diameter
To calculate the dynamic or running compression ratio, to the above list the specs for: connecting rod length, advertised cam duration, ICL and LSA are needed.
Although we can speculate on some of these values, the more accurate the information, the better the results.
comb chamber 67cc
http://www.dartheads.com/products/ai...aitfile_id/97/
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