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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

383 with the GM 847

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Old Apr 1, 2009 | 07:47 AM
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Default 383 with the GM 847
Any one here running a 383 with the GM 847 cam? Would like to know if they like this combination. Also if they ran into any problems with the rods hitting the cam. Thanks
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Old Apr 1, 2009 | 09:41 AM
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Originally Posted by 93Z28Sam
Any one here running a 383 with the GM 847 cam? Would like to know if they like this combination. Also if they ran into any problems with the rods hitting the cam. Thanks
Rod clearance shouldn't be an issue. What most people will wonder is why you're choosing the 847 when a custom grind will net you more bang for the buck.
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Old Apr 1, 2009 | 12:03 PM
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ive learned with a 383 anything over 550 lift rod clearance is an issue. or lobe lift of .390

been there and done that.



the one on the top is a comp cam. then i went to a lunati with a 4/7 swap and a small base.

that was the second comp cam i had. the first one the lobes started to flake off it. then i bought the same one to replace it. and it ran for a year then snapped.
Last edited by 7.0 camaro; Apr 1, 2009 at 12:09 PM.
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Old Apr 1, 2009 | 01:09 PM
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What rods are in there?
stock style pretty much dictate the use of small base cams.

H-beams seem to clear with ease w/ or w/o small base cams
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Old Apr 1, 2009 | 01:12 PM
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so over .550 lift is a problem? i have h beam rods and the cam will be up in the .600 lift thatll be an issue? how do i fix that?
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Old Apr 1, 2009 | 01:27 PM
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Originally Posted by z28rob18
so over .550 lift is a problem? i have h beam rods and the cam will be up in the .600 lift thatll be an issue? how do i fix that?
Small base circle cam. Measure for your applications required pushrod length.
I too would recommend getting a custom cam for your set up.
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Old Apr 1, 2009 | 02:32 PM
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Originally Posted by ss.slp.ls1
Small base circle cam. Measure for your applications required pushrod length.
I too would recommend getting a custom cam for your set up.
I would agree with that, you want to setup a 383 the right way
Last edited by slick1851; Apr 1, 2009 at 11:46 PM.
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Old Apr 1, 2009 | 03:11 PM
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yeah i had eagle i beam rods. im sure h beams will hit with .400 cam lobe lift
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Old Apr 1, 2009 | 09:45 PM
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my eagle i beams had zero clearance issues with my cam standard base circle
Last edited by myltwon; Apr 3, 2009 at 09:37 AM.
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Old Apr 1, 2009 | 10:23 PM
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how much duration did you have. i think that cam was 260-270 at .050
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Old Apr 1, 2009 | 11:17 PM
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Originally Posted by 7.0 camaro
how much duration did you have. i think that cam was 260-270 at .050
Yes it is duration more than lift that needs to be of concern. The 847 is 234/242 with .575/.590 lift with 1.6RR's on a 112lsa.
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Old Apr 1, 2009 | 11:23 PM
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ah. mine had .588 lift with a 1.5 rocker. i used 1.6's so it would have been like .627?
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Old Apr 3, 2009 | 09:37 AM
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230/242
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