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05-29-2020, 06:28 PM
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#1 |
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Senior Member
 
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,208
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Cam Downgrade
Guess I'm officially old now. Getting tired of the cam in my new crate engine. It has great power but the idle is pretty bumpy due to a 108 LSA. thinking about going to mild cam with a 112 LSA or similar or even the stock L31 cam. Has anyone done this and did you really notice any loss in power during normal driving? I know I'll lose some top end power but what about the low end?
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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05-29-2020, 06:33 PM
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#2 |
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,690
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Re: Cam Downgrade
Dude the stock L31 cam is pathetic. At least get an LT1 [gen2] cam.
Best option would be the smallest modern grind. I think comp has like 203/210 with a 110lsa.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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05-29-2020, 06:49 PM
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#3 |
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Registered User
Join Date: Jan 2013
Location: Eastern TN
Posts: 1,919
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Re: Cam Downgrade
Go custom grind so you can get that 114 lobe separation and still have some duration. Look at the LS cams and you will follow what I am saying. The only concern will be DCR if the crate motor has alot of compression to begin with.
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05-29-2020, 08:18 PM
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#4 | |
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Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Cam Downgrade
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05-29-2020, 08:48 PM
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#5 |
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Senior Member
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,208
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Re: Cam Downgrade
looks like the LT1 cam has a little too much lift. With Vortec heads max is about .480.
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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05-29-2020, 08:53 PM
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#6 | |
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Senior Member
Join Date: Mar 2005
Location: Jurupa Valley, Ca
Posts: 1,208
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Re: Cam Downgrade
Quote:
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Terry 1970 Custom Camper/C20 , GM Crate 350/7004R, Dana 60, factory AC |
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05-29-2020, 10:24 PM
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#7 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,709
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Re: Cam Downgrade
Marine cams or nitrous cams are great street cams for smooth idle and decent power. Looking through Comp's catalog there are a lot of options.
The XM262H has 218/224 @.050 and 112 lsa. And the XM256 is 212/218 @ .050 and 112 lsa to really smooth it out.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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05-29-2020, 11:46 PM
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#8 |
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Registered User
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,613
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Re: Cam Downgrade
94666492
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