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Old 12-28-2003, 08:14 PM
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305 rev limit?

Hi. i was just wondering what i should set the idle for on my 305, and what my rev limit should be. it's a rebuild 1977 chevy 305. stock, except for cast flat top pistons, headers, this cam, and these valve springs. the engine is making 9.3:1 compression.

Thanks.

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Old 12-28-2003, 08:25 PM
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With stock 305 heads, you likely wont rev past 4500 or 5000 anyway.
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Old 12-28-2003, 08:28 PM
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would it be safe to take it up to 5000 rpms or should i keep it around 4500 or so?
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Old 12-28-2003, 08:32 PM
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Well Lets see my stock 305 saw over 7000 RPM daily.... and it still runs.

I'd set the rev limiter at 6500 even though, unless you are out to destroy the engine doing clutch dumps and such, you want to shift around 5500 cuz going any farther does nothing good.

383, you can rev any engine as far as you want.... the question is where it breaks....
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Old 12-28-2003, 08:49 PM
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Have you ever heard of an engines powerband? ie idle-4500, 1500-5400, etc? I didnt say it was impossible to rev it high. Just wont pull itself that high.
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Old 12-28-2003, 09:25 PM
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I run a 9-1 305 with 601 heads, 300-36 Holley intake, 1 1/2" headers, and a 219/229, .456/.479, 114 cam. Peak power is right at 5400 rpm. Your cam is about the same size, so your peak rpm should be about the same.

Do some testing at the track. For your first run, shift at 4800. next run 5000. If you go faster, try 5200 for the third run. Keep going up until you go slower. Shift points can change from vehicle to vehicle, even if the same motor is used. Weight, tire size, gear ratio, and trans type all play a role in shift points. You may even find that your combo likes a higher 1-2 shift rpm than your 2-3 shift wants. I wouldn't be worried taking it to 6000 if thats what the motor needs and wants. Dan
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Old 12-28-2003, 09:27 PM
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THere's no reason to take a 305 over 5500 ever. Even if your engine does survive past that, your peak power is long since gone at 7000. You're actually creating less power by reving that high.

K
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Old 12-28-2003, 11:17 PM
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Quote:
Originally posted by killerformula
THere's no reason to take a 305 over 5500 ever. Even if your engine does survive past that, your peak power is long since gone at 7000. You're actually creating less power by reving that high.

K
YUP!
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Old 12-28-2003, 11:24 PM
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I'd set it at 6,000 RPMs. It will make it. I shift my 400 SBC at 6,500 all the time.
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Old 12-28-2003, 11:28 PM
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Quote:
Originally posted by killerformula
THere's no reason to take a 305 over 5500 ever. Even if your engine does survive past that, your peak power is long since gone at 7000. You're actually creating less power by reving that high.

K
I know this.... but you obviously haven't seen how much better you can do a burnout when you rev the engine past red and let the clutch out
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Old 12-28-2003, 11:33 PM
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Quote:
Originally posted by stonedchihuahua
I know this.... but you obviously haven't seen how much better you can do a burnout when you rev the engine past red and let the clutch out
I think that engine can spin more RPMs without damage. Revving an engine that high without load, such as in a burnout, now that is asking for it.
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Old 12-28-2003, 11:42 PM
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I'm sure you could do a decent burnout... like once. You're also looking at things like shattering your clutch, killing your axle or whatever else might happen. Poor little 305 of yours, I feel bad for it! Why not get some more cubes and leave that little thing be?


K
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Old 12-29-2003, 01:11 AM
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I have more cubes, I just need to assemble it

and I did this many many times, never broke nothin..... although the breakstand through second and then clutch slipping in 3rd caused an oil seal to blow on an exhaust valve
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Old 12-29-2003, 08:25 AM
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Killer......lol...... You guys have been TROLLED again...LOL...............

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Old 02-12-2004, 10:26 AM
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I have a 305 in a 77 nova.I rev it to 6 grand all the time and have had 0 problems out of it.It seems to like 6 grand better than 5.But I have installed true dual exhaust with no converters so that probably helps it a lot.And it also has a 15 inch elactric fan so that helps it rev a little quicker.
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