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Old 11-05-2009, 05:19 PM
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Building a vortec 350

Ok Im pretty new at building engines so all info is much appreciated.

I have a 98 vortec 350 and Im wanting to stroke it to a 383. It has a Jims performance harness on it and he told me to use a ram jet cam on it. Is that a good idea? And what will I need to do to use it? And allso what would be a good stroker kit?

Thanks in advance!

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Old 11-06-2009, 06:22 AM
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Quote:
Originally Posted by Dodgeman7979
Ok Im pretty new at building engines so all info is much appreciated.

I have a 98 vortec 350 and Im wanting to stroke it to a 383. It has a Jims performance harness on it and he told me to use a ram jet cam on it. Is that a good idea? And what will I need to do to use it? And allso what would be a good stroker kit?

Thanks in advance!
GM used the RamJet350 cam in their HT383 crate engines, so yes it will be a good torquey cam. You'll need a Stroker kit for the 1-piece rear main seal block as these are different from the older 2-piece rear main.
Scat has a good quality stroker kit >>> http://www.gofastnews.com/board/tech...le-budget.html
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Old 11-06-2009, 06:52 AM
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There are better cams out there but if you alreayd have a ram jet cam it does make for a nice very mild and drivable machine.
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Old 11-06-2009, 07:06 AM
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Quote:
Originally Posted by Dodgeman7979
Ok Im pretty new at building engines so all info is much appreciated.

I have a 98 vortec 350 and Im wanting to stroke it to a 383. It has a Jims performance harness on it and he told me to use a ram jet cam on it. Is that a good idea? And what will I need to do to use it? And allso what would be a good stroker kit?
A lot depends on how you plan to use this engine- 4x4 truck, race, DD, etc.
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Old 11-06-2009, 12:22 PM
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It's for a rockcrawler. The only reasen why I ask if the ramjet
is good is the guy that cut my harness and did my comp said he has a good program for the ramjet but what would u use? The rev limiter is set at 6,000 so I won't need a cam for anything higher than 6,000.

Thanks for all the info so far.
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Old 11-06-2009, 12:33 PM
How fast is fast enough?
 
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HRS-110235-10 from howards cams would give you great low end, but it won't go much past 5,000 RPM. Depending on your gearing/tire size that may be ideal though.
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Old 11-06-2009, 12:48 PM
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What Rpms is the ramjet good for?
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Old 11-06-2009, 12:50 PM
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the ramjet cam is basically a stock cam, which is good for basically stock power- no more than about 4500 RPM. The howards cam would produce more tq all the way from idle to redline.
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Old 11-06-2009, 01:27 PM
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Thanks alot.

On the stroker kits what is something I need to look for like do I need forged stuff or eternally ballinced or externally?
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Old 11-06-2009, 01:49 PM
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externally balanced is fine, a cast crank should be adequate, you can reuse your 5.7 rods, hypereutic pistons would be better than forged in this application. I would buy a Scat crank, some Speed Pro or KB pistons, and some ARP rod bolts. Also, you'll need a new balancer and flex plate and you'll ned to have it all balanced when you get all the parts together.
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Old 11-06-2009, 02:01 PM
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I want to by a full kit so what would you recomend?
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Old 11-06-2009, 02:07 PM
How fast is fast enough?
 
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any street duty? or just rock crawling?
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Old 11-06-2009, 02:35 PM
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Pretty much just rockcrawling Im going to try and make it where I can go to town on Friday night but any rig with 42's is pretty hard to make streatable. It is keeping the same fuel injection it has ben cut down Im just telling you that in case it changes anything and I need something so I can put it in low and crawl the stuff but when I need to I can give it to it and it go
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Old 11-06-2009, 02:45 PM
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short rods tend to do better at low RPMS, but 6" rods make the most power, I'd use 5.7's in this application, but 400 rods or 6" rods may be a hair better in some aspects, a 5.7 would be a good compromise.

hyper pistons, and a Scat crank are about and budget you can go and still be reliable. I'd reuse the rods you have but if you want to buy another set in a kit you can do that. I'd get it balanced by a local machine shop with a good reputation though, you never know how far mail order balancing can be off.
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Old 11-06-2009, 02:51 PM
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Ok man thanks alot for you're time. Does scat make a good kit?
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