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Old 03-28-2013, 08:55 PM
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Need guidance

Hi guys I'm a new guy into gas engines I was a diesel junkie for years and want to try something new. I have a 71 gmc with a 350 that I want to put power into sadly it's a 2 bolt main. I'm haven troubles choosing a cam. I want to bore it out .30 over and run 10:1 compression with forged flat top pistons. Help with a cam choice and heads would be helpful. The truck will be kinda a daily driver but mostly for fun at the track so max power I can get would be nice but still be able to run pump gas premium and drive it without needing to rev the piss out of it.

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Old 03-28-2013, 10:44 PM
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Need guidance

So you have a 2 bolt main block ande want to add hp. How much hp do you plan on with this engine? If you are worried about the 2 bolt caps you can switch the three center caps with a set of Howards billet steel 4 bolt splayed caps. Howards Cams Extreme Billet Main Caps H350S - SummitRacing.com. As for building a 350 engine I wouldn't. For the same amount of money you can build a 383 stroker engine with more hp and torque. Have your block checked out by your machine shop. Shop around for a 383 cid rotating assembly. Scat Engine Rotating Assemblies 1-90350BE - SummitRacing.com If you want good heads look at AFR, Dart, Brodix aluminum heads. The heads produce the power so don't cheap out.
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Old 03-28-2013, 10:48 PM
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Can I go with a 454 or will I have mounts to cut and move
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Old 03-29-2013, 09:03 AM
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To make a 383 stroke seems like allot of messing around did a little reading. What's wrong with getting 350 or 400 horse out of a 350 there's tons of them out there for parts there a dime a dozen cheap. I'm not looking for a 650 plus horse power truck what's the fun in that when you can bearly drive it in town or down the highway. I want as max as I can get with it being street able
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Old 03-29-2013, 10:39 AM
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400 hp is easy
a 383 will do it at a lower rpm
first buy heads that you can afford and match requirements
like e tec or 180,afr s
or equal in iron?
then we need to match cr and cam
then a 750 carb,good intake like performer
rpm, 1 5/8 long tube headers
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Old 03-29-2013, 10:54 AM
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How do you match cr and cam what are thE general rules
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Old 03-29-2013, 12:26 PM
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Is a 4 bolt main really that much better then 2 what is the actual pros and cons
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Old 03-29-2013, 01:28 PM
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Quote:
Originally Posted by Summit77 View Post
Can I go with a 454 or will I have mounts to cut and move
to install a bbc you need the bbc frame stands and mounts..
year one has the stands,, brothers trucks has the poly mounts..
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Old 03-29-2013, 03:36 PM
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Quote:
Originally Posted by Summit77 View Post
How do you match cr and cam what are thE general rules
These are the general rules. If you want to run it on the ragged edge ie maximum cr for minimum cam, you must pay close attention to things like quench, plug heat range, carb jetting, tuning generally...

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Old 03-29-2013, 03:56 PM
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Diesels are so much easier haha. Ok so compression and duration are important got that part now. So 454 with 10:1 compression is good?
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Old 03-29-2013, 04:18 PM
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Quote:
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Diesels are so much easier haha. Ok so compression and duration are important got that part now. So 454 with 10:1 compression is good?

....with a camshaft duration of 227 - 230 degrees at .050" lift. This is a basic guide. There is much written on the subject.
Here's a couple of links to articles that explain things a whole lot better than I can.

http://www.crankshaftcoalition.com/w..._compatibility

http://www.crankshaftcoalition.com/w..._relationships

http://www.crankshaftcoalition.com/w...ose_a_camshaft

Hope this helps.


Duke
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Old 03-29-2013, 08:04 PM
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454 now?
the biggest difference between diesel and gas is the fuels.If you understand how to make power with diesel engines,then build a gas engine like a diesel and use propane
Turbo charged propane engines make decent power for reasonable costs.and cheaper than a diesel.

maybe you have a couple diesel turbos kicking around your shop?
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Old 03-29-2013, 08:16 PM
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Well they say go 383 stroker so if I'm going threw the screw around with mix and matching different engine parts might as well go big block and get it over with. Diesels are easy a monkey could slam power in a diesel. Gas is tricky that's why I want to learn it. Just having trouble figuring out how to choose the right cam and heads and what cr to run. Turbo 454 would be nice but this is my first gas project and don't want to get to far out of my league and end up with something that sits half done for 15 years like most of the people I know.
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Old 03-29-2013, 09:45 PM
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start with simple math
how much horse power do you want?
then choose the heads that will make that much power.
choose N.A. or compressed.
choose engine size and RPM range that best delivers your needs.
then choose CR/cam/fuel management
Make sure ignition is compatible
Tune exhaust to match system
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Old 03-29-2013, 09:53 PM
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Ok I'd like 500 hp maybe 600. So I start with heads that can hold and produce that power. I want naturally aspirated. I want a 454 and it also need to be street able so idle to 5500 rpm would be ideal. Which my research says performer rpm cam and performer intake. I'd like 10:1 compression which here in Canada we can do so and run pump gas premium. Is this somewhat on a good track or am I far off?
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