05-30-2010 | #1 |
Join Date: Aug 2006
Location: Texas
Posts: 518
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Paging Marc Haibeck: Cams
I noticed reading Marc's schedule of ZR-1 preformance mods, he does not recommend a Stage One cam change with fully ported 350 cube LT-5's. Just curious, is that because of cost /reward or ? Most tuners think a stage one treatment is worth 20-25 HP in a ported 350. Is that optimistic ? A couple of us are making that decision right now and don't need to spend more money if the reward isn't there.
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1991 ZR-1, Black, Black, # 541 |
05-30-2010 | #2 |
Join Date: May 2010
Location: Japan
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Re: Paging Marc Haibeck: Cams
Greg,
Thanks for posting this question. Does Marc post on here? Excellent question as there are many different opinions from the different builders.
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 |
05-30-2010 | #3 | |
Join Date: Jan 2004
Location: Alex VA
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Re: Paging Marc Haibeck: Cams
Quote:
no question you can pick up some HP with cams, even on stock displacement. how much, will vary depending on quite a few factors, porting, tuning, ect... is it worth it? well, that depends on how "spendy" you are cams are expensive, and again, folks are working on new ones that might not be as bad but figure 1000-1500 PER cam (yikes!!) look at the black widow and snake skinner projects. both used revised cam profiles I believe on the LT5 and picked up to 475 HP or so with the stock displacement pete is well over that figure with more agressive porting and proper cam timing. but it's clearly NOT cheap and should only really be considered when you are pulling the engine and porting the heads, tops end. with the stock bottom end being rock solid, its a good way if you have "the means" to get more ponies the amount will all depend on the full combination and getting the cam timing spot on to match the porting and tune
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95 390 LPE ZR1 (505 rwhp) LSV = Lingenfelter Super Vette Twin Turbo 2003 Z06 (800 RWHP) |
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05-30-2010 | #4 |
Join Date: Apr 2006
Location: Ideho
Posts: 2,653
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Re: Paging Marc Haibeck: Cams
Marc does not post to any of the forums as far as I know. Call him direct at 630-458-8427. I think it would be more appropriate to talk with him directly on this matter.
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[I][FONT=Comic Sans MS]John Boyd[/FONT][/I] [I][FONT=Comic Sans MS][SIZE=1]Ideho[/SIZE][/FONT][/I] [FONT=Comic Sans MS][SIZE=1][I]2015 ZL1 [/I][I]Camaro #1121 BLACK/BLACK 6 SPD (540 RWHP)[/I][/SIZE][/FONT] [I][FONT=Comic Sans MS][SIZE=1]1991 ZR-1 #458 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK 72[/COLOR]k miles ([B][COLOR=red]SOLD[/COLOR][/B]) 1991 ZR-1 #473 [COLOR=red]RED/[/COLOR][COLOR=black]BLACK [/COLOR]37k miles ([B][COLOR=red]SOLD[/COLOR][/B])[/SIZE][/FONT][/I] |
05-30-2010 | #5 |
Join Date: May 2007
Location: Chicagoland, IL
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Re: Paging Marc Haibeck: Cams
I wonder if it wouldn't help to use the 93-95 cams in a ported 90-92.
It was my impression that cam profile was one if the reasons for the 405hp in the latter ZRs. |
05-30-2010 | #6 |
Join Date: Aug 2006
Location: Texas
Posts: 518
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Re: Paging Marc Haibeck: Cams
Hmm, I thought the difference was primarily in the plenum porting changes from early to late models..
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1991 ZR-1, Black, Black, # 541 |
05-30-2010 | #7 |
Join Date: Jan 2004
Location: Portland, OR
Posts: 1,057
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Re: Paging Marc Haibeck: Cams
It was a combination of things: revised cams, intake and exhaust manifolds.
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Robert ZR-1 Net Registry Oregon State Director 91 ZR-1 #431 Black/Black LPE 368 |
05-30-2010 | #8 | |
Join Date: Jun 2006
Location: Sparks, NV
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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 | #9 |
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: Paging Marc Haibeck: Cams
I will not get into this with cams on an open forum i might get the boot some might think i'm bashing/insulting them.
Just compare for yourself. Stock Cam Specs Intake .214 .229 .390 .390 Exhaust .214 .214 .390 .390 Stage I Specs Intake .228 .228 .415 .415 Exhaust .228 .228 .415 .415 Look and compare the two cam set up and tell me what's the differance,besides lift. You can figure it out yourself. 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 04:42 AM. |
05-31-2010 | #10 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,709
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Re: Paging Marc Haibeck: Cams
Quote:
Are you saying cam profile was the same, just LSA was tighter? It would make sense that if both ports are flowing equally, that you'd want same intake for both primary and secondary. Not sure about exhaust needing any help as I have heard it's pretty efficient already and then if you throw on headers... You want to make certain you don't over-scavenge robbing power. Pete, Who would give you the boot over a discussion on cams?! Last edited by XfireZ51; 05-31-2010 at 09:16 AM. |
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