Help - low comp bbc cam choice - Chevelle Tech
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post #1 of 24 (permalink) Old Jun 30th, 20, 11:27 AM Thread Starter
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Help - low comp bbc cam choice

Hi all,

I have a 1971 402 big block with 820 heads. Came from the factory with 8.5:1 compression. I have since added a weiand 8123 low rise dual plane (idle to 5500rpm), 750 holley, msd pro billet distributor and 6-al, 1 3/4 headers.

The heads flow:
71/52 at .100
145/105 at .200
227/144 at .300
260/176 at .400
279/190 at .500

My searches for a hydraulic FT cams has so far come up with Lunati Voodoo 10110701 .515"/.530" lift 213/219 at 050 duration 112 lsa basic operating RPM range:1,000-5,500

Im after plenty of torque and as much hp as possible as it is a 90% street car 10% strip. Is this a good cam considering my low comp? Do any of y'all have better recommendations?
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post #2 of 24 (permalink) Old Jun 30th, 20, 3:33 PM
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Personally I like a 108 centerline with low compression big block. Summit sells a hydraulic flat tappet that’s like the old Crane 282.
I’ve run that cam before in set up like yours. Great cam. It’s 226/226 at .050 512 lift I think, cut on a 108.
Find some Delphi hydraulic lifters. They’re the best by far.
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post #3 of 24 (permalink) Old Jun 30th, 20, 3:47 PM
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Gary
 
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Re: Help - low comp bbc cam choice

Low compression needs a small tight cam I agree with Roscoe. I certainly wouldn't run any bigger camshaft than that duration wise and I would probably suggest you go with a few degrees smaller. Esky is another good company
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post #4 of 24 (permalink) Old Jun 30th, 20, 5:12 PM
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Re: Help - low comp bbc cam choice

I'd look at Isky's Mega 264, seems like a good fit. Summit house brand have a good rep for quality.

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post #5 of 24 (permalink) Old Jun 30th, 20, 5:48 PM
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Re: Help - low comp bbc cam choice

Isky Mega cams work really well. The 280 mega cam on a 108 is the best one.
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post #6 of 24 (permalink) Old Jun 30th, 20, 7:01 PM
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The part number of the summit cam I referred to is 1796.
Really good cam. I think summit cams are actually Elgin grinds.
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post #7 of 24 (permalink) Old Jun 30th, 20, 8:23 PM
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Re: Help - low comp bbc cam choice

I know that you don't hear about them, but for stock heads Lunati's version of the Thumper cam should perform well in your 402. 224/236 @ .050", 269/296, .525"/.525" 108 LSA, 104 ICL.
Strong mid-range power. Great street cam. 2,500+ stall converter, 3.42+ gear and 9:1-9.5:1 compression recommended.

Use direct lube lifters Howards 91116.
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post #8 of 24 (permalink) Old Jun 30th, 20, 9:21 PM
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Re: Help - low comp bbc cam choice

What is your desired idle quality?
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post #9 of 24 (permalink) Old Jun 30th, 20, 9:48 PM Thread Starter
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Re: Help - low comp bbc cam choice

Thank you all for the responses, I will most definitely look into all the recommendations. From what I gather a 210-220 at 050 duration on a 108 lsa is somewhere around the mark.

My desired idle quality is that I want enough vacuum to run my power brakes, other than that I wouldn't mind a lopey idle (it is a classic muscle car at the end of the day).

I'm hoping that with the right cam, along with the other parts ive already added, I aim to run high 12s
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post #10 of 24 (permalink) Old Jun 30th, 20, 10:33 PM
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Just as a reference point, I ran the k03072 cam from summit. 514 lift, 226 duration at .050 on a 108.
My engine was a 9 to 1 454 with L29 heads, 8123 weiand intake, Holley 780, stock converter, 3.08 gear with power brakes and steering. Ran, drive and stopped great.
Pleasure to drive and sounded great.
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post #11 of 24 (permalink) Old Jul 1st, 20, 1:35 AM
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Re: Help - low comp bbc cam choice

Quote:
Originally Posted by moncam View Post
...My desired idle quality is that I want enough vacuum to run my power brakes, other than that I wouldn't mind a lopey idle (it is a classic muscle car at the end of the day)...
Quote:
Originally Posted by moncam View Post
Lunati Voodoo 10110701 .515"/.530"
I ran this cam in my 454 for over 10 years with peanut port heads and a little over 9:1 CR. Great street cam. Lots of low end torque and great vacuum. You wont get that lopy idle though or at least I didn't.

-Kevin
1965 Chevy Biscayne
<removed> 454cid, "peanut ports", Voodoo 60201
<coming soon> 460cid, Brodix RRO 270, 229/241 Hydraulic Roller
TH400, 3.36 Stock Rearend
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post #12 of 24 (permalink) Old Jul 1st, 20, 8:48 AM
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Re: Help - low comp bbc cam choice

Quote:
Originally Posted by moncam View Post
Hi all,

I have a 1971 402 big block with 820 heads. Came from the factory with 8.5:1 compression. I have since added a weiand 8123 low rise dual plane (idle to 5500rpm), 750 holley, msd pro billet distributor and 6-al, 1 3/4 headers.

The heads flow:
71/52 at .100
145/105 at .200
227/144 at .300
260/176 at .400
279/190 at .500

My searches for a hydraulic FT cams has so far come up with Lunati Voodoo 10110701 .515"/.530" lift 213/219 at 050 duration 112 lsa basic operating RPM range:1,000-5,500

Im after plenty of torque and as much hp as possible as it is a 90% street car 10% strip. Is this a good cam considering my low comp? Do any of y'all have better recommendations?
Honestly I think the cam YOU picked is better than any of the other suggestions. With only 402 cubes, and 8.5:1 compression, any cam bigger than the one you selected is going to be a complete dog at low RPM. JMHO

Mike

69 Chevelle 496/TH400
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post #13 of 24 (permalink) Old Jul 1st, 20, 10:52 AM
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Jeff
 
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Re: Help - low comp bbc cam choice

The was a guy on here that specd a custom cam for my 454 with low compression 781 heads.. I want the same as you, smooth idle with 20" of vac and torque right of idle.. After years of lumpy motors on the street, I've had enough.. lol
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post #14 of 24 (permalink) Old Jul 2nd, 20, 6:40 PM
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Re: Help - low comp bbc cam choice

with the flow numbers on your heads i would go with a hyd flat tappet comp cam 280 , no need to go more than 520 lift always match your cam to your heads 17 inches of vacume at idle
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post #15 of 24 (permalink) Old Jul 3rd, 20, 7:13 AM Thread Starter
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Re: Help - low comp bbc cam choice

Thank you all for the replies.

For this application, what does everyone think of the comp cam XE262 11-238-3 218/224 duration at .050 .504/.510 lift 110 LSA?
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