what factory gm cam shall I insert ----->
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From: eastern mass
Car: 87 firebird none soon
Engine: None
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Axle/Gears: 2.73 10 bolt
what factory gm cam shall I insert ----->
hey guys i don't want to do any head work to accommodate the cam because when i eventually go forced induction I will be ditching these heads most likely any how and the cam so i want a used roller cam with as close to .450 lift as possible and i figure a factory cam would be the cheapest.
thanks for reading!
thanks for reading!
Joined: Sep 2003
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
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From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Re: what factory gm cam shall I insert ----->
LT1 cam is a bit small for an 11:1 engine (even with 10.4:1 and aluminum heads the stock LT1s have spark knock issues because the cam is so small, and a big 117* LSA), but the regular LT4 cam wouldn't be a bad choice.
Look at Crane's website though, they have lots of high performance cams that are low lift - called "stock lift rule" cams... most are around .400 or so lift, but duration from as little as 190* @ .050 all the way to the 240-250 degree range. Maybe worth a look.
Look at Crane's website though, they have lots of high performance cams that are low lift - called "stock lift rule" cams... most are around .400 or so lift, but duration from as little as 190* @ .050 all the way to the 240-250 degree range. Maybe worth a look.
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From: Casselberry, FLA
Car: 88 V6 'bird/89TBI bird/85 T/A
Engine: 2.8/TBI/TPI
Transmission: V8 T-5/700R4 x2
Axle/Gears: 3.42 open/2.73 open/ 3.27 9 bolt
Re: what factory gm cam shall I insert ----->
I think that the stock LT4 cam is best as well...
I prefer used!
I prefer used!
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From: Houston, Texas
Car: 1991 firebird
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Re: what factory gm cam shall I insert ----->
I'ld agree with everyone else and say a stock LT4 cam. Air_Adam is right Crane Cams does have the "stock lift rule" camshafts but their all way to tight on the Lobe Serperation Angle "LSA" for computer controlled or forced induction. Their lobes are between 104-108* lsa.
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Joined: Oct 2002
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From: Saskatoon, SK, Canada
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
Re: what factory gm cam shall I insert ----->
I'ld agree with everyone else and say a stock LT4 cam. Air_Adam is right Crane Cams does have the "stock lift rule" camshafts but their all way to tight on the Lobe Serperation Angle "LSA" for computer controlled or forced induction. Their lobes are between 104-108* lsa.
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Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: what factory gm cam shall I insert ----->
depending on the duration, a 108 lsa cam will notbe that bad on a TPI computer...just need to really tweek the idle and low rpm part throttle settings to handle the overlap that cam has. Its been done before
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Joined: Jan 2007
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From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: what factory gm cam shall I insert ----->
yea I will probably go with the stock lt4 cam and 1.5 rockers. and you are correct i want it to work with my heads as they are now, but I also want ti to cost $30 and on top of that I could run a little boost on those cams because they have enough lsa
Joined: Sep 2003
Posts: 25,895
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: what factory gm cam shall I insert ----->
could run new springs and shim them up with offset locks to gain total safe lift of about .525" lift. then you could run a hotcam
u can snag a hotcam used for 100 bucks or so
u can snag a hotcam used for 100 bucks or so Senior Member
Joined: Jul 2006
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From: 4-22 / 7-25
Car: '91 Z28 L98 G92
Engine: Modded L98
Transmission: Modded 700R4
Axle/Gears: Modded 10-Bolt
Re: what factory gm cam shall I insert ----->
You can snag MY used ZZ4 cam for $75 plus shipping.
Bill
Bill
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Joined: Jul 2006
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From: 4-22 / 7-25
Car: '91 Z28 L98 G92
Engine: Modded L98
Transmission: Modded 700R4
Axle/Gears: Modded 10-Bolt
Re: what factory gm cam shall I insert ----->
I ran this cam (240 rwhp) with ZZ4 valve springs on stock L98 iron heads (disclaimer- stock except I trimmed the bottom edge of the valve locks .030";, deburred the trim to eliminate stress risers...) for 10 years and saw a few trips to 6K. It works. Bill
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From: CT
Car: 92 trans am clone
Engine: LO3
Transmission: 700r4
Re: what factory gm cam shall I insert ----->
hes right if you want higher lift you can buy cheap +.050 keepers basically anywhere as long as theyre 7 degree. the also sell +.050 retainers that i know manley sells that fits stock size springs.
BTW burnout91 what other mods did the car have when it dynoed 240whp? 350 i assume?
BTW burnout91 what other mods did the car have when it dynoed 240whp? 350 i assume?
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Joined: Jul 2006
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From: 4-22 / 7-25
Car: '91 Z28 L98 G92
Engine: Modded L98
Transmission: Modded 700R4
Axle/Gears: Modded 10-Bolt
Re: what factory gm cam shall I insert ----->
When it made 240 hp, it had the ZZ3(4) cam, Edelbrock TES (the dual diameter primaries version), Edelbrock Hi-Flo base, SLP runners, Bosch 22# injectors, and most of the minor / free mods. Yes, 350 cu. in. Bill
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