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Old 02-28-2010, 09:51 PM
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cam choice???

hello everyone, I'm trying to decide what cam i want to stuff in my 305. I have a 79' chevy truck with a 83' firebird 305 engine with the 58cc heads i put in it last summer when my 350 wore out. My set up is: 305ci with 58cc heads (9.5:1 comp) Holley 600cfm carb, edelbrock dual-plane performer intake, full lenth headers with tru dual exhaust(2 flowmaster mufflers and an H-pipe) I also have a th350 trans with hard shift kit, stock converter, and i have 3.73 gears in the rear. It a very mild setup and i'm wanting more pep by choosing the right cam. I'm contemplating a single or dual pattern camshaft... I'm wondering with my good flow exhaust and 58cc heads if I could use a single pattern? Or either one? I like the xe262 cam and the xe268. Im favoring more of the 262 cam. I want a noticable idle and good all around power. I want streetable and getting on it on the strip sometimes. So what do you all think?...Single or dual pattern 262 cam? Any input is greatly appreciated. Thanks,
Mark

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Old 02-28-2010, 10:12 PM
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You should be able to run the 262 without issue. Make sure you get the correct valve springs. Break it in with valvoline racing oil, as it still has ZDDP so the cam doesn`t go flat.
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Old 02-28-2010, 10:15 PM
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cam choice???

okay great. And what about single or dual pattern cam?
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Old 02-28-2010, 11:12 PM
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Lets put it like this. When headers and duals are added to the mix, I run a single pattern cam. Most SBC`s have a very efficient exhaust port, the intake port is not so good. Most dyno tests I`ve seen where dual patterns were compared against single patterns the single would always make more torque and horsepower. A dual pattern cam is to me for use when the exhaust system is not as efficient as it could be, such as factory exhaust manifolds and etc. Turn the clock back you`ll see most chevy factory cams were dual pattern, however, unless you look at the vehicles they knew would likely recieve headers after the car was sold, such as the duntov 30 30 cam, and the L79 cam, both were single pattern. However, with your cam pick, I think it`s a little big for a 305, but your lower rear gear will make up for it. Small displacement engines are very cam sensitive. I`m rather conservative on my cam picks and if it were I, I would go with something a step smaller and I wouldn`t care it didn`t lope at idle. The XE cam is a good cam, it`s got a good power band, your lower gears will make up for the loss with a small displacement engine. So, even in your case in comparison of dual and single pattern cams, the XE has everything your looking for, low end response and a noticeable idle. You would benefit likely by adding a higher stall converter to eliminate idle creep in gear.
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Old 03-01-2010, 10:45 PM
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cam choice???

thanks alot DoubleVision for the useful info. I greatly appreciate it. And that does make sense with the single and dual pattern kind of cams. So im gonna go with the single patttern cam...probably the 256 or the 262.
Thanks again man!


Mark
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Old 03-01-2010, 10:48 PM
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Scroll down on this page and look at Tech Tip 2003, Longer Exhaust Duration.....
http://www.iskycams.com/techtips.php#2003
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Old 03-03-2010, 03:12 AM
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cam choice???

thanks for the link techinspector1, great link!

Last edited by markzepp820; 03-03-2010 at 03:16 AM. Reason: wanted to add more
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Old 03-03-2010, 09:27 AM
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Pull the heads off your 305 and home port them to get the port airflow up.
( the stock 305 heads have modest airflow. If you want to go fast you need to improve them. They need a good bit of hand work to unleash the hounds.)

Reinstall using a felpro #1094 shim style gasket to get the cr up a bit while you are at it. use A Isky 262 Supercam pn 201262. get some stock replacement style 1.6 rockers to maximize performance on the home ported heads with the new cam.

Summit makes a nice and affordable stock type rocker arm with a roller tip in a 1.6 ratio Your net valve lift will be .463" at the valve with the isky 262 cam and 1.6 rockers.

Any of the replacement stock diameter "Z/28" valve springs including isky 205D are fine.

Be sure to degree in the cam so it is on a 104 intake C/L for max perf.

A "3000 stall" torque converter is a nice upgrade for this combo.
You'll see a bit less than the rated 3000 stall behind a 305cid motor. (less engine torque) A 3000 stall is not too much for this combo at all.

You'll be smokin your share of 350's (and Fords too) when you do all these details to your lil 305.

Last edited by F-BIRD'88; 03-03-2010 at 09:39 AM.
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Old 03-03-2010, 09:42 AM
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Quote:
Originally Posted by markzepp820
thanks for the link techinspector1, great link!

Mark, keep in mind ...its the LSA that makes'em cut-up when they idle. A circle-track grind camshaft is ground on a 106/108 LSA..you know how sweet they sound when they idle! 110LSA is sortuva choppy idle also. 112/114LSA is smoother. Keep in mind though...that rump-rump sound comes at a cost as far as ease of city driving and fuel mileage is concerned. The torque converter issue as well.
6sally6
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Old 03-04-2010, 05:05 AM
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cam choice???

thanks you all for your replies. Great info!
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