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NEW CAM and Computer

 
Old 02-11-2019, 08:48 AM
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Troyschroeder
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I'm rebuilding my 84 engine and have a question about the cam and computer that will need to be synchronized to provide the proper amount of fuel in the cross fire fuel injected system. The guy rebuilding the engine asked if there is a cam the is already set up with the computer to minimize any impacts???? Any comments or suggestions are appreciated. thanks
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Old 02-11-2019, 05:33 PM
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Kevova
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You might contact tuners ,PCM of NC formally pcmforless, one may have something in their files. Rarely are mail order perfect "out of the box", some tweaking is normally required. Installing adjustable FPR maybe helpful.
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Old 02-11-2019, 11:45 PM
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zachaeous
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An OEM replacement stock camshaft is manufactured by Sealed Power. The part number is SEALED POWER CS766. It is a decent cam manufacturer and will work with the ECM in your 84. Rock Auto has them listed on their website.

I did some mods to my new engine for my 84 and used the 327-350HP old Gm 151 camshaft and the stock ECM handled it just fine.

Last edited by zachaeous; 02-12-2019 at 12:42 AM.
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Old 02-12-2019, 12:29 AM
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The comp 12-388-4 works just fine with the stock tune of that's what you're going for. I have it in mine and it has a little more grunt than stock but nothing crazy. I didn't know what would work when I did the intake so I chose that. Looking back now, a 212/218 would probably work fine... you can get away with quite a bit with the stock ECM.
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Old 02-12-2019, 08:30 AM
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Thanks for the info, It will be bored out 30th and the engine rebuild company had just asked about what the best cam would be that would work with the stock computer in the car. Do you have a recommended manufacturer for the cam?
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Old 02-12-2019, 08:34 AM
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Thanks for the reply, the engine will be bored out 30ths. And the engine guy had the question on what cam would work best with the stock computer or if they sold new computer to match up with a cam they sell. Do you have a cam shaft recommendation and manufacturer? thanks again
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Old 02-12-2019, 08:35 AM
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Thanks I will do some research
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Old 02-12-2019, 02:36 PM
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Tom400CFI
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Originally Posted by zachaeous View Post
I did some mods to my new engine for my 84 and used the 327-350HP old Gm 151 camshaft and the stock ECM handled it just fine.
Originally Posted by 84 4+3 View Post
The comp 12-388-4 works just fine with the stock tune of that's what you're going for....a 212/218 would probably work fine... you can get away with quite a bit with the stock ECM.


I ran a sbc 400 with a 224/234 cam, heavily ported intake, bored TB's, headers/exhaust and other mods. This was on the stock ECM/Chip/Tune...for a 170hp, 305 CFI...so I had ventured quite a long ways from "stock". The thing ran like stock...except way MORE so, and even got great gas mileage, to boot. The key is to avoid changing the cam so much that you change the SHAPE of the tq curve substantially. If you keep the SHAPE of the tq curve about the same as stock, you can make fueling adjustments with injector sizing and fuel pressure and get quite acceptable results.
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Old 02-12-2019, 03:11 PM
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Thanks Tom, I'm also running new headers and exhaust on mine. I believe the stock 350 has 209 hp, I'm hoping to add nearly 100hp to that.
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Old 02-12-2019, 04:06 PM
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Tom400CFI
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I don't think that you'll get 100 hp on a 350 CID w/o a tune OR some drivability issues. I feel that 100 hp is going to require too much cam. I had a friend (you can search him on here; CFI-EFI) who had an '84; he had a heavily ported intake, "free mods", manifold back dual exhaust (w/no cats), everything else on the engine was stock. He was right around 250 chp or so. So if you added a MILD cam, ported heads, you might get another 20 or so? I can't see getting to 310hp w/o using so much cam that it wouldn't be annoying to drive w/o a tune done on it. I was able to do that (~310ish hp) b/c I increased displacement by 95 CID...so the bigger cam in my engine still didn't dramatically alter the shape of the tq curve from the stock cam in the stock 305.
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Old 02-13-2019, 02:38 PM
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Originally Posted by Tom400CFI View Post
I don't think that you'll get 100 hp on a 350 CID w/o a tune OR some drivability issues. I feel that 100 hp is going to require too much cam. I had a friend (you can search him on here; CFI-EFI) who had an '84; he had a heavily ported intake, "free mods", manifold back dual exhaust (w/no cats), everything else on the engine was stock. He was right around 250 chp or so. So if you added a MILD cam, ported heads, you might get another 20 or so? I can't see getting to 310hp w/o using so much cam that it wouldn't be annoying to drive w/o a tune done on it. I was able to do that (~310ish hp) b/c I increased displacement by 95 CID...so the bigger cam in my engine still didn't dramatically alter the shape of the tq curve from the stock cam in the stock 305.
With a more modern cam grind you might be able to squeak out 300 and it would be alright but you would really have to match everything well and even at that point, it could be a bear to drive still. IIRC the crane 114132 is about as large as plays well... That could squeak it to 300 with some head work and exhaust imo....
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