Roller cam choice - Chevelle Tech
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post #1 of 31 (permalink) Old Jul 3rd, 19, 5:28 PM Thread Starter
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Roller cam choice

Looking to add a roller cam to my motor. I have a sbc 350 .040 over. Brodix IK180 heads, air gap intake, Holley sniper efi with timing control so full tune ability. Muncie m20 with 3.73s. I’d like to add a roller cam and obviously upgrade the valve springs and add roller rockers if necessary. What cam would you guys recommend? What duration ball park? I contacted comp and crower to get recommendations but I want to hear your guys ideas too. Thanks

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #2 of 31 (permalink) Old Jul 3rd, 19, 8:04 PM
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Re: Roller cam choice

How do you like your 274 cam and what kind of use is car going to see - daily driver, occasional track etc. Depending on how you like the 274 cam and what are the specs on that one we can then assess where to go from there. Based on the information here and guessing you want a little more cam say like a 230-235 duration at .050 (say 280-290 at 0 lift - advertised) and like a .550 lift assuming your pistons can take the extra lift and duration. There are a couple of guys here that do cams and can chime in or someone that has a similar motor. Make sure the valve guides/seals have also been adjusted/cut down for the increased lift.
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post #3 of 31 (permalink) Old Jul 3rd, 19, 9:08 PM
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Re: Roller cam choice

Justin

I have a 350 roller block with this Luanti cam in it.

https://www.lunatipower.com/street-m...k-280-288.html

Of course, mine is cut on a 108 lsa. My cranking compression is right at 180 psi. Builds a lot of pressure going down the quarter or track. Runs fine on 93 octane and stays at around 185 to 190 in the 100 degree Florida heat. My timing curve is 19 initial with 36 total all in by 2700. I have a can that delievers 12 degrees of advance for a initial of 31 and a cruise of 48. Its a little soft at idle and seems to come on strong around 2000 and pulls hard to 6000 to 6200. In my 67 with a M21 and 4:10 gears, I ran a best of 12.4 quarter back in the 2010. My compression ended up at 10.3 with a strong quench of .035 with a uncut deck and a Felpro 1094 gasket. My heads are the same as yours and have been untouched with a Edelbrock RPM air gap with Crane roller rockers. My carb is a Holley 650 DP. I think I have around 420 to 430 horsepower with this combo. I did experience a little low speed bucking with this, but tuned out a lot of it.

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #4 of 31 (permalink) Old Jul 3rd, 19, 9:21 PM Thread Starter
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Quote:
Originally Posted by Lew540 View Post
How do you like your 274 cam and what kind of use is car going to see - daily driver, occasional track etc. Depending on how you like the 274 cam and what are the specs on that one we can then assess where to go from there. Based on the information here and guessing you want a little more cam say like a 230-235 duration at .050 (say 280-290 at 0 lift - advertised) and like a .550 lift assuming your pistons can take the extra lift and duration. There are a couple of guys here that do cams and can chime in or someone that has a similar motor. Make sure the valve guides/seals have also been adjusted/cut down for the increased lift.
Daily driver, I like the xe274. I just a cam with great street manners but some good power. Nothing too crazy.

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #5 of 31 (permalink) Old Jul 3rd, 19, 9:26 PM Thread Starter
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Originally Posted by Aaron View Post
Justin

I have a 350 roller block with this Luanti cam in it.

https://www.lunatipower.com/street-m...k-280-288.html

Of course, mine is cut on a 108 lsa. My cranking compression is right at 180 psi. Builds a lot of pressure going down the quarter or track. Runs fine on 93 octane and stays at around 185 to 190 in the 100 degree Florida heat. My timing curve is 19 initial with 36 total all in by 2700. I have a can that delievers 12 degrees of advance for a initial of 31 and a cruise of 48. Its a little soft at idle and seems to come on strong around 2000 and pulls hard to 6000 to 6200. In my 67 with a M21 and 4:10 gears, I ran a best of 12.4 quarter back in the 2010. My compression ended up at 10.3 with a strong quench of .035 with a uncut deck and a Felpro 1094 gasket. My heads are the same as yours and have been untouched with a Edelbrock RPM air gap with Crane roller rockers. My carb is a Holley 650 DP. I think I have around 420 to 430 horsepower with this combo. I did experience a little low speed bucking with this, but tuned out a lot of it.
Nice, that cam does seem to fit the bill, not too much duration and good street manners. I definitely don’t want a bucking since this is a 100% street/daily car. And you’re also running the Brodix 180 heads? What valve springs are you running?
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1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #6 of 31 (permalink) Old Jul 3rd, 19, 9:35 PM
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Re: Roller cam choice

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Originally Posted by JF74chevelle View Post
Nice, that cam does seem to fit the bill, not too much duration and good street manners. I definitely don’t want a bucking since this is a 100% street/daily car. And you’re also running the Brodix 180 heads? What valve springs are you running?
Mine has light bucking if you try and idle while moving along in first gear. If you give it a little gas in 1st gear as your lightly moving along and keep the rpms at 1200 then there is no bucking. The timing curve is the key.

Im running whatever the springs where that were recommend by Luanti. Nothing exotic or anything.

Yes, that is the Brodix 180 heads with a 2.02 valve. Nothing fancy.

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #7 of 31 (permalink) Old Jul 3rd, 19, 9:36 PM Thread Starter
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Quote:
Originally Posted by Aaron View Post
Quote:
Originally Posted by JF74chevelle View Post
Nice, that cam does seem to fit the bill, not too much duration and good street manners. I definitely don’t want a bucking since this is a 100% street/daily car. And you’re also running the Brodix 180 heads? What valve springs are you running?
Mine has light bucking if you try and idle while moving along in first gear. If you give it a little gas in 1st gear as your lightly moving along and keep the rpms at 1200 then there is no bucking. The timing curve is the key.

Im running whatever the springs where that were recommend by Luanti. Nothing exotic or anything.

Yes, that is the Brodix 180 heads with a 2.02 valve. Nothing fancy.
Nice, glad to hear from someone with real world experience with a similar set up. Thank you
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1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #8 of 31 (permalink) Old Jul 3rd, 19, 9:40 PM
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Re: Roller cam choice

Quote:
Originally Posted by JF74chevelle View Post
Nice, glad to hear from someone with real world experience with a similar set up. Thank you
Welcome!

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #9 of 31 (permalink) Old Jul 4th, 19, 2:30 AM Thread Starter
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Originally Posted by Aaron View Post
Quote:
Originally Posted by JF74chevelle View Post
Nice, glad to hear from someone with real world experience with a similar set up. Thank you
Welcome!
Are you running power brakes and steering? What vacuum is it producing?

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #10 of 31 (permalink) Old Jul 4th, 19, 7:11 PM
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I’d run this with your combination of parts

https://www.summitracing.com/parts/hrs-110325-08/
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post #11 of 31 (permalink) Old Jul 4th, 19, 8:43 PM Thread Starter
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Originally Posted by 68Maliblue View Post
I’d run this with your combination of parts

https://www.summitracing.com/parts/hrs-110325-08/
That is exactly the cam I was looking at too. That duration seems like a good area to be.

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #12 of 31 (permalink) Old Jul 4th, 19, 8:52 PM
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Re: Roller cam choice

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Originally Posted by JF74chevelle View Post
Are you running power brakes and steering? What vacuum is it producing?
Yes, I do run power brakes and steering. They work fine. The brakes are as good as it would be with a more stock like cam that produces around 19 at idle but they work well enough.

It pulls like 12 to 13.

When I started bracket racing I switched over to a manual steering set up.

67 chevelle malibu / SS/ custom

Currently undergoing a metal work to remove all rust, if I ever get there.

Cant decide on prostreet or cruiser with a 4 speed.
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post #13 of 31 (permalink) Old Jul 4th, 19, 9:15 PM
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Re: Roller cam choice

That Howards cam looks like a good choice. LSA at 108, it's going to have a rougher idle than you have now. if there's enough clearance everywhere I'd run 1.6 rockers on 7/16 studs with it.

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post #14 of 31 (permalink) Old Jul 5th, 19, 1:56 PM Thread Starter
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Originally Posted by Tom Mobley View Post
That Howards cam looks like a good choice. LSA at 108, it's going to have a rougher idle than you have now. if there's enough clearance everywhere I'd run 1.6 rockers on 7/16 studs with it.
They have the same cam but ground on a 110 LsA. I don’t know if the 108 would be too tight for the fuel injection.

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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post #15 of 31 (permalink) Old Jul 5th, 19, 4:17 PM Thread Starter
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Re: Roller cam choice

looking to run this cam https://www.summitracing.com/parts/hrs-110325-10
would these valve springs work? https://www.summitracing.com/parts/hrs-98213-k12

1974 chevelle with 73 laguna nose sbc 357 Brodix IK180 heads Comp Cams XE274H Edelbrock RPM airgap 650 AED double pumper, M20 muncie, Truetrac with 3.73s
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