vortec cr question???
07-02-2008, 05:55 PM
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Car: 89 formula/00 z28
Engine: carbed 350/ls1
Transmission: 700r4/ a4
Axle/Gears: 3.23 posi/ 3.73 posi
vortec cr question???
how does gm come up with a stock vortec motor having 9.4 cr. having 12cc dished pistion with them .025 in the hole? , 64cc vortec heads, .045 head gasket how does that come up to 9.4 cr? i did the math and come up with around 8.9 cr. so what am i missing here?
07-02-2008, 10:24 PM
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Car: 1987 Camaro Sport Coupe
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Axle/Gears: 7.5 inch 342
Re: vortec cr question???
I have read that Vortec heads are more like 61cc. Still not 9.4. By the way my wifes aunt lives in Taccoa. Beautiful place.
Last edited by BASSETT IROC 85; 07-03-2008 at 11:46 PM.
07-03-2008, 03:39 PM
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Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Re: vortec cr question???
Where do you get a 12cc dish? Every GM-built OE Vortec headed 350 I've seen had flat top pistons in it, which is typically a 5cc or 6cc "dish", not 12cc.
07-03-2008, 11:47 PM
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Car: 89 formula/00 z28
Engine: carbed 350/ls1
Transmission: 700r4/ a4
Axle/Gears: 3.23 posi/ 3.73 posi
Re: vortec cr question???
well that what they come was dish piston just like the l98. and the heads are off it now
07-03-2008, 11:54 PM
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Car: 1987 Camaro Sport Coupe
Engine: 355
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Axle/Gears: 7.5 inch 342
Re: vortec cr question???
I'm sorry for the typo, I mean 61 cc. I have seen that when you cc them they come up 61 instead of the advertised 64 cc. Not going to make a great difference.
07-04-2008, 12:02 AM
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Car: 89 formula/00 z28
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Transmission: 700r4/ a4
Axle/Gears: 3.23 posi/ 3.73 posi
Re: vortec cr question???
anyone have any idea?
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07-06-2008, 02:08 PM
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Re: vortec cr question???
I think it's a typo. The r code 350 I put in my car had dished pistons when i pulled it apart..... no way it was over 9:1. The heads are 64cc's stock. Just figure the compression up on paper for whatever you're working on. It is more accurate then advertisments. Here is a pic to show it is dished. I've only rebuilt the one r code though, but everything was as it came from the factory.
07-06-2008, 03:22 PM
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Car: 89 formula/00 z28
Engine: carbed 350/ls1
Transmission: 700r4/ a4
Axle/Gears: 3.23 posi/ 3.73 posi
Re: vortec cr question???
I think it's a typo. The r code 350 I put in my car had dished pistons when i pulled it apart..... no way it was over 9:1. The heads are 64cc's stock. Just figure the compression up on paper for whatever you're working on. It is more accurate then advertisments. Here is a pic to show it is dished. I've only rebuilt the one r code though, but everything was as it came from the factory.
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