Roller cam choice - Page 2 - Chevelle Tech
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post #16 of 28 (permalink) Old Jul 5th, 19, 6:48 PM
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Take a look at these. Summit has them too but Jegs has more info on them

http://www.jegs.com/i/Manley/660/22410-16/10002/-1
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post #17 of 28 (permalink) Old Jul 6th, 19, 10:11 PM
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Re: Roller cam choice

If you like your Comp XE cam they have a hydraulic roller line as well.

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post #18 of 28 (permalink) Old Jul 10th, 19, 4:28 PM Thread Starter
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Spoke to Howard’s cams and they said that I could shim my current valve springs to work. I need an installed height of 1.800” mine are currently at 1.850. Here’s the valve spring specs currently on the heads:

1.250 Hydraulic Valve Spring – CC 981,
100 lb Closed, 300 lb Open,
1.850 Installed Height,
.525 Maximum Lift

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 #19 of 28 (permalink) Old Jul 10th, 19, 6:58 PM
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Re: Roller cam choice

I'd think about some better springs. How high do you want to spin it?

Jim

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post #20 of 28 (permalink) Old Jul 10th, 19, 7:43 PM Thread Starter
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Quote:
Originally Posted by 77 cruiser View Post
I'd think about some better springs. How high do you want to spin it?
I agree I’m not comfortable running those springs. I’d like to go about 6k or so.
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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 #21 of 28 (permalink) Old Jul 10th, 19, 9:39 PM
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Re: Roller cam choice

I'm at 165/420 I go to about 6500. First set was 140/380 Eric thought he saw some evidence of float after I dynoed it.

Jim

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421 Profilers ported by Eric Weingartner, Straub HR 3200 conv. from Jake 200-4r w/ 3.73's
Machine work by Torvinen's machine
11.93 @ 112.7 & tuning
67 Imp.SS for the wife 275 hp 327-TH350
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post #22 of 28 (permalink) Old Jul 10th, 19, 9:57 PM
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Give Chris Straub a call and tell him what you have and what your goals are. He can recommend you a semi custom cam designed to work specifically with the flow characteristics of your heads. That’s what I did and my 383 made 505 hp at 6k rpm with 200 cc Edelbrock etec 200 heads(which are ok but not great). Chris knows his stuff.

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383, 10.3:1, etec 200 heads, isky 280 mega, holley 770,
th350, 2600 stall,
12 bolt, 3.55 eaton posi
no time slip yet

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post #23 of 28 (permalink) Old Jul 11th, 19, 9:09 AM
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Re: Roller cam choice

Springs are relativley inexpensive and should be based on the cam you buy. I would get that along with the correct retainers. Remember if you shim .050 you loose that in lift capacity as the max lift is probably based on some coil bind number. so your 525 max lift becomes 475 max lift.
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post #24 of 28 (permalink) Old Jul 11th, 19, 11:57 AM Thread Starter
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Okay, I spoke to Chris (awesome customer service) and he said he has a roller cam that fits the bill. He said “That GTA cam of mine has made north of 400/400 in similar projects and will give you both power and reliability.” What do you guys think? Whole kit would come with proper valves springs and lifters etc.
These are the specs.

Lift is with 1.5 Ratio Rocker

Adv. Dur. Int/Exh 280/294

Dur. at .050" Int/Exh 221/235

Valve Lift Int/Exh .510/.510

Center Lines Int/ Exh 104/112

LSA 108
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post #25 of 28 (permalink) Old Jul 11th, 19, 9:59 PM
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I think that’s pretty spot on for a nice street cam. 221 duration on the intake is in the ball park for a 350 and the 108 will make your power come on strong and give you a good rumble. You should have pretty good vacuum numbers too. I ordered the lifters from Chris also. Nice Morel hydraulic rollers. I ordered the matching clay smith springs after the fact. I had the motor apart at the time so I had the local machine shop set up the heads. Came out at 420 lbs over the nose of the cam. Called clay smith and they said it was fine. I’m rambling at this point. Let us know how it runs when you get it back together. I think it will be a very nice running small block with a very usable powerband on the street.

1970 Malibu
383, 10.3:1, etec 200 heads, isky 280 mega, holley 770,
th350, 2600 stall,
12 bolt, 3.55 eaton posi
no time slip yet

just got out of paint
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post #26 of 28 (permalink) Old Jul 12th, 19, 12:28 AM Thread Starter
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Would this cam really benefit from using 1.6 rockers?

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 #27 of 28 (permalink) Old Jul 12th, 19, 6:26 AM
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Re: Roller cam choice

Don't cheap out on the springs. I used the AFR 8019 springs. I swapped mine out before running the engine and used a Lunati .535/.550 231/[email protected] hydraulic roller in my 355 with 195 AFR heads.
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post #28 of 28 (permalink) Old Jul 15th, 19, 2:17 PM Thread Starter
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I decided to pull the trigger on the Straub spec cam hopefully should be getting the parts soon. Kit included morel lifters, valve springs, Cam button and bolt locks. I’ll pull the motor to do the swap degree it, measure pushrod length etcI’m going to go with the Howard’s 1.6 ratio 7/16th stamped steel rockers with poly locks.

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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