Comp Cams 306 - 383ci
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Comp Cams 306 - 383ci
Hi all,
looking for people that have experiece of this cam in either a 383, or 350. I'm building a 383 and was planning to use this, but am having doubts regards drivablity on the street.
Comp Cams "306" LT1 Camshaft, 230 / 244, .510 / .540 112 LSA
Please see tuning discussion here - https://www.thirdgen.org/forums/diy-...eperation.html
looking for people that have experiece of this cam in either a 383, or 350. I'm building a 383 and was planning to use this, but am having doubts regards drivablity on the street.
Comp Cams "306" LT1 Camshaft, 230 / 244, .510 / .540 112 LSA
Please see tuning discussion here - https://www.thirdgen.org/forums/diy-...eperation.html
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Comp Cams 306 - 383ci
306 is popular cam in 383' s with manual.Would need good stall in auto.
Has lots of exhaust timing so better suited to stockish heads with low exh flows rather than aftermarket heads
If you have decent heads then more like 230 / 236 >.550 lift on both sides
Has lots of exhaust timing so better suited to stockish heads with low exh flows rather than aftermarket heads
If you have decent heads then more like 230 / 236 >.550 lift on both sides
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From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
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Re: Comp Cams 306 - 383ci
LT1 guys have run it on good ported heads with good exhaust flows and still produce 400whp+ on 383's with 11 to 1 compression
my custom grind is very similar duration wise at .050" timing specs, but i have loads more lift.
That cam will make a wide power curve on the top end. great flat hp curve up top so help you dial in your shift points.
Driveability will be ok. using the 730 ecm will require good tuning since that cam has 74.5 degrees overlap. Thats a good amount of overlap. For a 350 that would be hard to tune but doable with the 730 ecm, but on a 383 its much more liveable.
my custom grind is very similar duration wise at .050" timing specs, but i have loads more lift.
That cam will make a wide power curve on the top end. great flat hp curve up top so help you dial in your shift points.
Driveability will be ok. using the 730 ecm will require good tuning since that cam has 74.5 degrees overlap. Thats a good amount of overlap. For a 350 that would be hard to tune but doable with the 730 ecm, but on a 383 its much more liveable.
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Joined: Apr 2007
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From: BC, Canada
Car: C4 Vette
Engine: Gas Guzzler
Transmission: ZF-6 Manual
Axle/Gears: 3.75
Re: Comp Cams 306 - 383ci
thanks for your relpies so far! some good advice...
another question is what Distributor gear would I want for this??
another question is what Distributor gear would I want for this??
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From: TX
Car: 1984 Firebird SE
Engine: 388 sbc, Brodix Track 1s
Transmission: turbo 350 transmission
Axle/Gears: 4.10 gears
Re: Comp Cams 306 - 383ci
Can use a stock distributor gears since you are not changing to a roller cam. This is about the only time you need to worry about distributor gear.
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From: TX
Car: 1984 Firebird SE
Engine: 388 sbc, Brodix Track 1s
Transmission: turbo 350 transmission
Axle/Gears: 4.10 gears
Re: Comp Cams 306 - 383ci
Just be careful with choosing a cam for the 383 with 6inch rod. Clearance will be your enemy and will probably have to stick with a small base cam as I have just discovered and will be going to a roller cam.
Last edited by mcbchild; Jun 10, 2008 at 10:10 PM. Reason: Spelling errors
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From: Heart of Dixie
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Re: Comp Cams 306 - 383ci
I think it is to much cam for the street with an automatic trans. in a 350. 383 will be ok.
Joined: Sep 2003
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From: Pittsburgh PA
Car: 89 Iroc-z
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Axle/Gears: MWC 9” 3.00
Re: Comp Cams 306 - 383ci
update my experience with a very similar cam. I love it in a 383. Not a bad streetable cam if i do say so myself 
Runs mid 11's at over 116mph and its not 100% tuned yet, nor does it have proper gears/launch yet. But yet it drives very nicely around town. I just cant tune the idle yet. Idles ok in park/neutral but it gear it tends to want to surge alittle
Runs mid 11's at over 116mph and its not 100% tuned yet, nor does it have proper gears/launch yet. But yet it drives very nicely around town. I just cant tune the idle yet. Idles ok in park/neutral but it gear it tends to want to surge alittle 
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