05-31-2010 | #11 |
Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Re: Paging Marc Haibeck: Cams
The stock cams look real healthy for a 4 valve per cyl. engine.
In comparison the stage 1 cams appear to be pretty radical (IMO). |
05-31-2010 | #12 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,710
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Re: Paging Marc Haibeck: Cams
Quote:
I forget who I was speaking to while at BG, but they mentioned that the stock motor was actually "overcammed". Could explain why ported heads work well with stock cams. |
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05-31-2010 | #13 | |
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Paging Marc Haibeck: Cams
Quote:
H
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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05-31-2010 | #14 | |
Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Re: Paging Marc Haibeck: Cams
Quote:
IMO the stock cam's are fine for a stock mildly ported 350. |
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05-31-2010 | #15 | |
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: Paging Marc Haibeck: Cams
Quote:
Oh,I forgot this is not a corporate sponsered and run forum. Exhaust does not need that much help,the exhaust/intake ratio is well over what N/A motor needs. Do a web search a good ratio for N/A motor is 75-85% we have well above that on a stock head so porting the intake helps bring those #'s closer to perfect. With big exhaust cams,unless you go with nitrous or turbo/supercharged you will find it hard to tune, idle quality suffers, loose some low end power/torque,drivability suffers . DRM had .239 intakes with stock exhaust,LPE had B cams .239 IN. .221 EX You may ask why have Stage III's or LPE C cams because bigger is always better What i have seen is what GM figured out over 20 years ago keep exhaust duration around 15 degree split. Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage Last edited by Pete; 05-31-2010 at 01:58 PM. |
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05-31-2010 | #16 |
Join Date: Jan 2004
Location: Portland, OR
Posts: 1,057
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Re: Paging Marc Haibeck: Cams
I'm feeling pretty well bashed and insulted Pete, you should be duly booted
I've been thinking about our talk at BG. To bring the lift up to .425 requires taking .035 off the base circle but to get more duration don't you need to take off more than that? Working on figuring out a way to measure valve height in relation to the cam journals... damn you for giving me ideas Pete
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Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368 |
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