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-   -   Camshaft selection and overdrive (https://67-72chevytrucks.com/vboard/showthread.php?t=811772)

General23cmp 09-10-2020 09:15 PM

Camshaft selection and overdrive
 
Looking at a 224 duration (at 0.050Ē) cam and another 228 one for my 6L build. Itís a high compression pump gas build (I should be able to get by with a little more duration), and will have a 4L60e behind it. Iím open to torque converter options, depending on the cam I select, but was wondering about overdrive and bucking/drivability. Iíll probably be changing my rear gears to help raise my cruising rpms, but am debating how far to go. I do want overdrive.

What have you guys with overdrive been able to get away with for duration and have good cruise manners at 50+ mph?

Duck1 12-04-2020 07:54 PM

Re: Camshaft selection and overdrive
 
You never mentioned your rear gears or wheel size

gmc684x4 12-04-2020 09:46 PM

Re: Camshaft selection and overdrive
 
I would ditch the 4l60e and start looking for a 4l80e which will live longer behind your 6 liter

EVRLET 12-05-2020 03:59 AM

Re: Camshaft selection and overdrive
 
What makes you think a 4L60E should be ditched for a 4L80E? Thereís nothing wrong with a 60 behind a 6.0. Heck, GM offers an LS3 connect and cruise package with a 65 or 70 transmission.

So many people bash the 60 because the internet bandwagon said theyíre junk. Thereís nothing wrong with a 60 transmission.

I can attest to my stock 60 in my 2001 Silverado with a turbo 5.3 that has taken a beating for the last 3 years and still is going strong. Yes, all stock except it has a Circle D converter. I have built a 60 with just about every Sonnax part installed and itís behind an 800hp 6.0 turbo. That transmission is going on itís 5th year with zero issues.

So many haters of the 60 but so many also donít know how good a 60 is. Two each their own.

gmc684x4 12-05-2020 12:02 PM

Re: Camshaft selection and overdrive
 
Its a 6 liter comes with a 4l80e

and the fact I can take a mid mileage 4l80e use it as is with out having to put a ton of money into it with a lot of sonex parts to make it handle the abuse i know it will get

LS short box 12-05-2020 06:11 PM

Re: Camshaft selection and overdrive
 
My .02 on the cam is I would do the 224I duration about 230 on the exhaust. Around .590 lift with either a 112 or 114 lobe center line. The 112 will give you bit more low end with more chop at idle. The 114 will smooth out the idle a bit but loose a bit at the low end. Should be a piece of cake to tune.
I like Circle and Yank billet converters. I have 3000 stall Yank in my 68. It drives like stocker until you nail it. Because where I live there are a lot of 40 mph roads so I have the tuner program the ECM to lock up the torque converter at 45 mph. Prevents lugging the engine.
I'm running 20" tires. 285/40. 4:10 gears.

General23cmp 12-05-2020 06:48 PM

Re: Camshaft selection and overdrive
 
Quote:

Originally Posted by LS short box (Post 8845438)
My .02 on the cam is I would do the 224I duration about 230 on the exhaust. Around .590 lift with either a 112 or 114 lobe center line. The 112 will give you bit more low end with more chop at idle. The 114 will smooth out the idle a bit but loose a bit at the low end. Should be a piece of cake to tune.
I like Circle and Yank billet converters. I have 3000 stall Yank in my 68. It drives like stocker until you nail it. Because where I live there are a lot of 40 mph roads so I have the tuner program the ECM to lock up the torque converter at 45 mph. Prevents lugging the engine.
I'm running 20" tires. 285/40. 4:10 gears.

Thanks. As you can see I posted this 3 months ago, but Iím glad to see your response. I went with a 224/228-0.600/0.600 on a 112. Itíll be some time before itís all ready though.


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