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Old 11-19-2012, 12:54 AM
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When I started this build I was just planning on getting an engine running, I decided to spice it up a bit with the bigger cam, it seemed like a good choice, but I guess it wasn't

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  #17 (permalink)  
Old 11-19-2012, 01:40 PM
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Adjustable Bore? Interesting
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Old 11-19-2012, 02:08 PM
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I installed World Products S/R 58cc heads on my old 1986 305, with a Crane cam, Powermax 2020 designed for computer controlled motors which mine was at the time.
I had very good low end torque.
The heads and cam went onto my 350 and worked just as well sans computer.
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Old 11-19-2012, 03:07 PM
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To the OP: You're going to need to spend a LOT of time and MONEY to get that cam to perform well in that engine, pretty much you need a new ->EVERYTHING<-!

Your best bet is just to switch out the cam with something a bit smaller, like the XE268H. 12-242-2 - XTREME Energy

Note that's a flat tappet cam, I assumed you're using flat tappet since it's an 84 and you didn't mention a retro fit.

That cam will give you better power down low, and you won't need to swap your converter, although a 2000-2200 will benefit it. Likely your stock gearing will work just fine, but again some 3.42s would be nice. Porting the heads always helps. You'll want to swap the intake to a performer rpm and a better carb. That smaller cam should give you a nice sound at idle as well.
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Old 11-19-2012, 03:18 PM
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That is a mean 305 Fbird. Is that the one you are working?

IF you are pulling the trans back for a converter. You might as well put a 3000 stall in. The 2200-2400 are to close to the stock stalls from the cars I remember. The 90's and on, had factory 2400-2800 stalls in what you may loosely call performance models. Even a 3000 is going to foot brake around 2200. You are not likely to lose drivability at that level.

Your cam is similar to the RPM design. That is a little much for a 305 driver, but still it should be workable. It will like/need the compression increase you factored.
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Old 11-19-2012, 06:44 PM
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Well I tried firing it up today and had a problem, it seems like the starter doesn't have enough tourque to crank it over, it would crank a few times (slowly), it fired a couple times too, but it would stop cranking before it fired enough to get running, it seems to be draining the batter very quickly. First I used the battery out of my truck, fired a few times then wouldn't crank anymore, I bought a brand new battery with 780 cranking amps and the same thing happened. Any idea what the problem might be?
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Old 11-19-2012, 06:50 PM
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check starter draw.check that the cables are clean and well connected
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Old 11-19-2012, 06:57 PM
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The cables are clean and well connected, it just seems like the starter is draining the batteries before it will start, after charging up a battery it will crank fast, fire a few times, then it will slow down to the point where it stops firing, then it stops cranking, it has to be the starter, the one battery is brand new and the other one was out of my truck and it starts without a problem
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Old 11-19-2012, 07:05 PM
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With the plugs out does it turn by hand normally?

Load test the battery.

If it is amperage that is suspect, run 2 batteries in parallel circuit. 1400 amps will spin any 11:1 engine fine.
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Old 11-19-2012, 07:12 PM
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i was able to crank it with a breaker bar by hand with the plugs in, i also did try running the 2 batteries in parallel, same thing happens, could it be the starter?
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Old 11-19-2012, 07:21 PM
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It cranked by hand normally you say . The batteries are tested assuming you took them to napa.

What is the gear reduction on the starter? what type of starter? Shimmed?
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Old 11-19-2012, 07:29 PM
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I will have the batteries tested, and the starter is a re-manufactured stock starter for that engine and that year, the gears meshed perfectly without shims, think it could be the starter not having enough torque?
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Old 11-19-2012, 07:32 PM
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Its not my first guess.

If the oem type starter is good it should turn it over even at 11:1 compression.
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Old 11-19-2012, 07:40 PM
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it turns it over fine, but it seems as the starter heats up it loses power, to the point where it wont be able to crank the engine at all
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Old 11-19-2012, 07:40 PM
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What is your inital? Fbird told you about recurving, did you heed?

Can you twist/retard the distributor while it is cranking to a point it becomes easy enough to light.
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