l69 305 h.o. how big a cam should i get?
#1
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Car: 84 camaro
Engine: 72 chevy 406 sbc
Transmission: 700r4
Axle/Gears: 3.42 eaton posi
l69 305 h.o. how big a cam should i get?
i got a l69 305 h.o. motor just how big a cam can i put in it?and not be too big that it hurts performance rather then helps? it rebuilt but all stock it does have a better crank i guess the one was out of stock at gm so they gave me a better then stock one ?oh its a 84 non computer car 4 brl carb thanks
im looking for better performance with a lumpy idle if its possible?
im looking for better performance with a lumpy idle if its possible?
#2
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You don't want to go nuts. "Lumpy" is way too much for these motors. A litte choppy maybe, but that's the absolute limit if you expect it to run decently.
The factory stock L-69 cam is a little short on duration (not much) but could use a little more lift and a little tighter LSA.
Intake duration around 210-215*, little more on the exhaust and a ~112* LSA is about what you're looking for. HOWEVER.... you must also keep lift under ~.460" or you'll be hitting your reatainers against you guide seals on a stock head.
The Comp Cams XE 256 would be perfect but the LSA is a little too tight at 110*. Fortunately, they make a "computer controlled" version of this cam with a slightly wider 112* LSA under part number 12-256-4. Here's a link to the cam card for it....
Camshaft Specifications
Also, stock valve springs are not going to keep even a mild high performance cam under control in the upper RPMs. You NEED to upgrade the valve springs at the same time. A set of Comp 981 springs will work just fine and drop right into your stock valve spring pockets with no machining whatsoever.
The factory stock L-69 cam is a little short on duration (not much) but could use a little more lift and a little tighter LSA.
Intake duration around 210-215*, little more on the exhaust and a ~112* LSA is about what you're looking for. HOWEVER.... you must also keep lift under ~.460" or you'll be hitting your reatainers against you guide seals on a stock head.
The Comp Cams XE 256 would be perfect but the LSA is a little too tight at 110*. Fortunately, they make a "computer controlled" version of this cam with a slightly wider 112* LSA under part number 12-256-4. Here's a link to the cam card for it....
Camshaft Specifications
Also, stock valve springs are not going to keep even a mild high performance cam under control in the upper RPMs. You NEED to upgrade the valve springs at the same time. A set of Comp 981 springs will work just fine and drop right into your stock valve spring pockets with no machining whatsoever.
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Car: 84 camaro
Engine: 72 chevy 406 sbc
Transmission: 700r4
Axle/Gears: 3.42 eaton posi
thanks for the info bout how much better performance will this yeild i allready run 14.88 in the 1/4 with alot of right wheel spin, lol thats next on the ole checklist
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
oh its a 84 non computer car 4 brl carb thanks
So then you don't really need that wider LSA. The 256 is still a good suggestion. You can always use aftermarket springs (definately good idea), and offset locks/retainers to help give breathing room for more lift.
Have you done exhaust, and a better air intake to the motor yet?
Hard to say what time gains you'll see, but I will say, the cam, lifters, springs, is a very good investment, HP/dollar is nice
#6
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.480"/.500" 238*/248* @ .050 114lsa
hrm...no that's kinda much, that's what i'm running in my 10.4:1 .030 over 305 with ported 113 heads...
214*/224* @.050 .442"/.465" lift 114lsa, that's what was in the first combo, 9.5:1 compression .030 over 305 with stock 416 heads. went 13.03@103.
hrm...no that's kinda much, that's what i'm running in my 10.4:1 .030 over 305 with ported 113 heads...
214*/224* @.050 .442"/.465" lift 114lsa, that's what was in the first combo, 9.5:1 compression .030 over 305 with stock 416 heads. went 13.03@103.
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Car: 84 camaro
Engine: 72 chevy 406 sbc
Transmission: 700r4
Axle/Gears: 3.42 eaton posi
i dont remember 60 ft times cant find my old slips from last summer, but its got full exhaust from stock manifolds to a hollowed cat and a flowmaster muffular the intake is i think the original alluminum gm one, or thats what was one it when i bought it. but i think ill just swap motor before i dump a ton of money into a 305 just to be where a 350 would be stock thanks for all the replys
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Car: 83Z28 HO
Engine: Magnacharged Dart Little M 408
Transmission: G Force 5 speed
Axle/Gears: Moser 9" w/Detroit Trutrac
The cam I used when I had my L69 in the car was a Crane Compu-cam 2040.
I noticed a substantial increase in power throughout the RPM range. - And it played nice with the computer!
I noticed a substantial increase in power throughout the RPM range. - And it played nice with the computer!
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Car: 1982 Trans-Am
Engine: 355 w/ ported 416s
Transmission: T10, hurst shifter
Axle/Gears: 10 bolt, true-trac, 3.73
NOVA! I'm itching to see what that 305 will run, find out yet?
#10
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Originally Posted by Sonix
NOVA! I'm itching to see what that 305 will run, find out yet?
track time on friday. i'll post time slips too!
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Car: 00 Camaro SS
Engine: 5.7
Transmission: 6 speed
I used a Summit brand for my 84 l69.214/224, 0.442/0.465. It worked great and had more power than the stocker.
https://www.thirdgen.org/forums/body...-car-home.html
https://www.thirdgen.org/forums/body...-car-home.html
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Car: 1984 Camaro Z28
Engine: L69 305 H.O.
Transmission: T-5
Axle/Gears: 3.73
I found an old Car Craft magazine article on the web where they took a 1983 Camaro with the L69 and did an engine build with all of the specs for the heads, intake , cam and exhaust, etc. I'll dig it up and send you the specs.
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Car: 1986 Pontiac Firebird s/e
Engine: 305 Chevy
Transmission: 700r4
Axle/Gears: 2.77 for now
CAn you
Is there any way you can scan that article and post it here on this thread, please . I also believe either CAR CRAFT/HOT ROD magazine did an article as well around that time period on how to build the 305 for performance as well, or how to hop up a Z28 for more performance.
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Car: 1984 Camaro Z28
Engine: L69 305 H.O.
Transmission: T-5
Axle/Gears: 3.73
Sir, Is there any way you can scan that article and post it here on this thread, please . I also believe either CAR CRAFT/HOT ROD magazine did an article as well around that time period on how to build the 305 for performance as well, or how to hop up a Z28 for more performance.
http://www.hotrod.com/how-to/engine/...-engine-build/
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Car: 1986 Pontiac Firebird s/e
Engine: 305 Chevy
Transmission: 700r4
Axle/Gears: 2.77 for now
Re: l69 305 h.o. how big a cam should i get?
Sorry, I meant the early 80's. But thanks for this link. I did read that.
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Car: 1986 Pontiac Firebird s/e
Engine: 305 Chevy
Transmission: 700r4
Axle/Gears: 2.77 for now
Re: l69 305 h.o. how big a cam should i get?
Found it. It was the HOT ROD magazine sept 1982 issue. I will see about getting it scanned for everyone and put it forum. "How to hot rod the Z/28" is the article. I'm just brought it from ebay, and soon as I get it, I will get it scanned for the 3rd gen group.
Last edited by w41duvernay; 01-17-2016 at 10:07 AM.
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Car: 1986 Pontiac Firebird s/e
Engine: 305 Chevy
Transmission: 700r4
Axle/Gears: 2.77 for now
Re: l69 305 h.o. how big a cam should i get?
Is there someone in this gruop who would be able to scan this article for everyone to read in the 3rd gen forum? I don't have a scanner, and I would be willing to send copies of this article to get scanned for this group.
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