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Old 11-07-2005, 01:59 PM
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finding my new cam

ok im in the market for a camshaft dont know alot about them except they make a engine sound like heaven can some one help me pick a good cam at a decent price.by buying a new cam im looking for lots of low end power.but guess i need some midrange also.its for a 1975 gmc sprint with a stock rear for now till i get gears im wanting 4.10 not much highway driving with it.it has a th350 trans,307sbc motor with headers out to glass packs,holley dual plane intake,holley 600cfm carb.the rest is all stock.

ps i saw some cams for like 79 bucks on ebay there speed pro brand with lifters are they any good thanks alot

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Old 11-07-2005, 03:30 PM
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79$ with lifter !! i wont buy a used stock for that price .. i doubt its reliability

try Competition Cams , the best way to buy a cam & be sure its working as much as u paid for is to know who ur buying form .. they are not like crank shaft or rods these parts will work anyway , cams needs engineers & craftsmen. I can say this is the most important part in performance .

268 to 292 that is the rang you be looking for ,more than 284 you'll need to change Converter and rear end .
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Old 11-07-2005, 04:55 PM
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with a 307 you can't go very wild of a cam, especially becuse the stock comp ratios are crap on 307's. pobably just 1 up from stock specs will be best, which would be like 1,500-4,000 rpm.
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Old 11-07-2005, 06:20 PM
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so you guys think a big cam is out of the question. for low end power do i need big or small cam.i no hardly anything about how cams work.would it even be worth a new cam for added power would i not even see any gains.may be i should wait and get lower gearing first i hear its the best bang for my nickel
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Old 11-07-2005, 11:21 PM
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In my opinion, the cam should be the last item you buy for your combination. Get the gear installed first. I don't know if you've ever run a 4.10 gear, but it runs the r's up pretty good, so if you are interested in fuel mileage, you're going the wrong way. It'll make the truck accelerate much better than it does now and you may decide at that point that you don't need a longer cam. A good compromise between acceleration and fuel mileage can be had with a 3.73 gear.
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Old 11-07-2005, 11:47 PM
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Originally Posted by techinspector1
In my opinion, the cam should be the last item you buy for your combination. Get the gear installed first. I don't know if you've ever run a 4.10 gear, but it runs the r's up pretty good, so if you are interested in fuel mileage, you're going the wrong way. It'll make the truck accelerate much better than it does now and you may decide at that point that you don't need a longer cam. A good compromise between acceleration and fuel mileage can be had with a 3.73 gear.
what a rear end will do without encreas in power !!?? lock ur speed in 1/2 mile !!
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Old 11-08-2005, 05:41 AM
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thanks ill wait on my cam and get deep gears installed so far my mods has got me a little difference in the seat of my pants caint wait for gears every one says there the way to go cause man i got airplane gears the truck feel like it could do 150 and all i want is low end neck snaping take off
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Old 11-08-2005, 06:25 AM
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Originally Posted by 75sprintguy
thanks ill wait on my cam and get deep gears installed so far my mods has got me a little difference in the seat of my pants caint wait for gears every one says there the way to go cause man i got airplane gears the truck feel like it could do 150 and all i want is low end neck snaping take off
bro its allways up to you , , what kined for Trany you got there ?
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Old 11-08-2005, 06:48 AM
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Gears will do wonders without more HP. If he is going from a 2.xx gear to a 3:73 it will make a dramatic increase to the seat of the pants meter.

I would do a gear change 1st then dig in to the engine.
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Old 11-08-2005, 01:09 PM
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Quote:
Originally Posted by camaro 77
what a rear end will do without encreas in power !!?? lock ur speed in 1/2 mile !!
A numerically higher rear gear ratio will allow more power pulses from the motor in the same revolution of the tire, resulting in more work applied to the tire, resulting in quicker acceleration.
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Old 11-08-2005, 01:10 PM
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Originally Posted by bigbadbowtie
Gears will do wonders without more HP. If he is going from a 2.xx gear to a 3:73 it will make a dramatic increase to the seat of the pants meter.

I would do a gear change 1st then dig in to the engine.
Exactly right.
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Old 11-08-2005, 02:42 PM
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Originally Posted by techinspector1
A numerically higher rear gear ratio will allow more power pulses from the motor in the same revolution of the tire, resulting in more work applied to the tire, resulting in quicker acceleration.
higher ratio is more power ??!!!!!

tell me something ,, Same car with higher cam VS Same car with 4.1:1 ratio 1 mile race distance 350th trany.. who wins ?
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Old 11-08-2005, 02:58 PM
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tell me where you can find a mile stretch to race on? most are 1/8 or 1/4 mile and in all likelyhood a 307 with a cam won't make great mph with tall gears it will just stop pulling at a certain rpm depending on wieght, drag etc.just won't have the power to keep going. mph=horsepower ,acceleration =tourque which gears multiply.
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Old 11-08-2005, 03:09 PM
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what he said ^^^
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Old 11-08-2005, 03:11 PM
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Originally Posted by barnym17
tell me where you can find a mile stretch to race on? most are 1/8 or 1/4 mile and in all likelyhood a 307 with a cam won't make great mph with tall gears it will just stop pulling at a certain rpm depending on wieght, drag etc.just won't have the power to keep going. mph=horsepower ,acceleration =tourque which gears multiply.

i donít really wanna continue arguing about it more .. its so simple .
lm talking about the street racing , who wins ??.
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