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Old 03-31-2015, 07:14 PM
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Please help me understand some basics before I get started

Hello everyone Elijah here I'm all new to all this I just bought my first hot rod and was hoping to get a little help with some things I'm having trouble with on it and hopefully learn all I can from every one I can first of all its a 1975 Chevy c10 short bed truck with the stock 350 small block the guy I bought it from told me he installed the biggest cam he could before having to change the springs can someone please tell me what size cam would that be also I am wanting to change the open 12 bolt rear end and put a posi rear end under it but don't know which car or truck to look to in the junk yard for the right one. Thanks

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Old 03-31-2015, 10:37 PM
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the cam will be a guess at best as everyone thinks a big cam can go under stock springs. can you post a video.
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Old 03-31-2015, 11:17 PM
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Well the motor is together and running I drive it every day so don't know how I could take a pic of the cam with out taking it apart any idea or are you just looking to hear the motor running
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Old 03-31-2015, 11:34 PM
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. Hello... welcome... where do you live?


. Can't tell by listening... a power pull in 2nd gear might give some indication of where the powerband RPMs are (if you have a tach)...


. Biggest cam for stock springs could mean using the old original springs... or it could mean new performance springs that still fit in the stock location...

. In any event, even the stock cam was too big for the stock too low compression ratio of those 1975 engines and so there is little to no gain from a bigger cam... just more RPMs at less torque...


. Best bang for the performance buck is a set of inexpensive generic headers and true dual 2 1/2" or 3" exhaust pipes/mufflers... (assume it has 4 bbl. carb.)


. Next would be some new pistons to fix the compression ratio... called 8 or 8.5:1, but actually about only 7.6:1... need to bump it to about 9.5:1... also get the cam spec.s while in there...


. If have stock single exhaust, you're currently operating at about 125-175 HP... the mods outlined above bump you up to about 325-350 HP... an improvement you can definitely feel... also more MPG (a bonus)...
.

Last edited by BuzzLOL; 03-31-2015 at 11:41 PM.
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Old 04-01-2015, 08:40 AM
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It is possible to get some idea of what cam is in there, but will take a good mechanic with a dial indicator, and a degree wheel. Measurements taken at the intake/exhaust rocker arms will tell total lift, and the degree wheel will give an approximation of when it's happening. After that's all done, it still wont be exact, but if it's important to you, it can get close.
I'd probably just start by doing the upgrades BuzzLOL listed, and not get too hung up on figuring out exactly what cam is in it.
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Old 04-04-2015, 08:52 AM
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About the camshaft, I would say that if you like the way the truck runs, you do not need to worry about what camshaft the engine has!

I cannot help you with your limited-slip rear question...
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Old 04-04-2015, 09:14 AM
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. Most of those trucks will have an open rear, kinda hit or miss to find a posi one... just have to jack up one rear wheel, put tranny in neutral, and see if you can turn the wheel easily by hand... may have to simply buy a clutch type posi unit for it...

. You didn't tell us the main use for the truck, so hard to say what size cam you're looking at...

. My first guess would be the guy put this 204/214 cam in it:

http://www.summitracing.com/parts/sum-k1102

https://www.youtube.com/watch?v=3LPlbVG93JU
.
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