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Old 09-29-2008, 08:10 PM
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How high can my 283 rev, safely.

Steel reconditioned crank and rods, stroke 3", bore 3.935", hydraulic cam/roller rockers, hei , double hump 68-70 heads, 2-bolt main....

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Old 09-29-2008, 08:18 PM
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It`ll rev as high as the valve train lets it. The cam and the condition of the valvetrain dictates with a iron fist how high it can rev. But remember, if you rev it high on a regular basis with stock parts you`ll always be against the weakest link in the engine and in your case it would be the rods. If you place a big enough cam in it to rev to 7000 RPM, your going to lose a lot of low end torque and drivability. You would have to gear it really low to make up for the loss, especially in a small cubic inch motor as you have, it would not make a good street machine. Whatever cam you run it must be matched to the valve springs and if you expect to rev it high on a regular basis you`ll need more than reconditioned rods to live, same goes for the pistons.
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Old 09-29-2008, 08:24 PM
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Well right now as high as you want it to... the info you give is very vague...

The 1053 GM crank is fine
The stock rods are crap, especially with stock bolts. The SJ 283 rods are week. If you have some 327 castings or aftermarket rods then things are a bit better.

Roller cam will probably float the valves at 6,000-6,200 depending on the lifters you are using.

With good rods, the gm crank, main studs, solid cam, and good machine work, the 283 should be good to 7,000 and on up depending on the compression and cam.

Heads- The double hump chambers should come in somewhere between 62-64cc depending on the casting number. I've cc'd some and they were at 66cc. What kind of piston are you running? A flat top is going to kill your compression, the stock 283 power pack heads were in the 58cc range, with flat tops and the 64cc fuelies you are looking at 8.3-8.5 even with a .015 steel head gasket. I hope you have some kind of dome or +cc piston.

Give more info...
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Old 09-29-2008, 08:56 PM
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283 specs

Flat pistons
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Old 09-29-2008, 08:58 PM
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just roller rockers

The motor has roller rockers.
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Old 09-30-2008, 06:35 AM
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solid lifters and arp fasteners might hold it together past 6k.

i can take my single plane hydraulic 323" mopar w/shaft roller rocker about 5,800rpm.
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Old 09-30-2008, 09:36 PM
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What kind of rods do you have?

Roller rockers will help but they aren't the week link at this point

Flat tops? What's your deck height? I assume .025 (stock) If that's the case, don't worry about the rpms, your compression is way too low to think about anything past 5,000. That thing will sign off at 4,500.

Get more compression then you can worry about valve float and rod strength.
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Old 09-30-2008, 10:09 PM
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use some good rod bolt's,If you have the cam and valve train,It will pull 6K easy! Gotta wing those 283's up to make some power!
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Old 09-30-2008, 10:26 PM
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I'd say safely just under 7000 rpm.
The factory engineers never intended this engine to rev much higher than 5500-6000 rpm.
From what I understand about Engineering Development the safe operating standards are calculated by exceeding safe to the point of failure & then backing off from that point.

It would be my belief that the early engines (265-283's) were designed (by Ed Cole) to Exceed NORMAL operating conditions so failure testing wasn't necessary at that point.

However later on & decades later the general public through warranty claims & related issues performed much of the research for GM on what would last & what would fail throughout normal & abnormal service.
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Old 09-30-2008, 10:36 PM
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It is easier to answer your own question when you realise that your engine is many different systems operating together.

Each system has a maxinum speed at which it will operate without failure.

Some systems will far exceed others.

I have listed some examples in your engine.

Crankshaft ---- probably good to 9000rpm
Connecting rods depend heavily on piston weight----- 6000-8000 rpm
rod bearings ---- 6000 rpm
cam bearings ---- 14000rpm
main bearings ---- 8000 rpm
oil pump ---- 10000 rpm
oil level before starvation on stock pan setup ---- 5500-6500rpm
valve springs depend heavily on valve & retainer weight. 5000-7000 rpm
pistons depend on bore clearance as loose skirt clearance tend to promote failure at all engine speeds.

As you can see it really depends on what system fails first.

Usually the valvetrain will give out first, followed by the rod bearings & then the rods themselves through piston interita wieght.

I wouldn't rev that sucker much past 6500 if you want to enjoy it for any length of time, but hey that just me. Have fun
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Old 10-01-2008, 05:17 AM
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283 specs

Quote:
Originally Posted by GenYnNC
What kind of rods do you have?

Roller rockers will help but they aren't the week link at this point

Flat tops? What's your deck height? I assume .025 (stock) If that's the case, don't worry about the rpms, your compression is way too low to think about anything past 5,000. That thing will sign off at 4,500.

Get more compression then you can worry about valve float and rod strength.
Thanks for responding....The engine has stock reconditioned rods, aftermarket flat tops, the deck hieght could be .050,( due to the aftermarket pistons being smaller) The compressed head gastket thickness could be .040. This is bugging me...So I plan on removing the heads to measure everything.
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Old 10-01-2008, 11:12 AM
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for 5,800 rpms i did this to my 318"

without going expensive, this is what i did. i can rev to 5,800. probably 6k safely without breaking "the big parts".

273 forged crank, 6.123" rods

get thinner gaskets , .025" compressed.

mill the heads .050" mine 318" s are (52cc)

peen your stock rods thats what i did.

used grade 8 fasteners, or ARP$

i vote for a hi volume oil pump. a good crank scraper, or screen, not a windage pan tray.

performance balance (cant use a centerforceclutch)

single plane intake

mopar iron shaft roller rockers. and hipo factory 340 4bbl cam.

stock HEI distributor, with a frankenstiened GM 4 pin HEI system.

Last edited by spinn; 10-01-2008 at 11:23 AM.
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Old 10-01-2008, 01:34 PM
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52cc combustion chambers!?

Spinn,

What's the static compression ratio on that 318c.i.d. mopar?
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Old 10-01-2008, 01:52 PM
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Spinn

What else was was done to the heads after removing .050. Did the intake mounting sides need to be re-aligned?
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Old 10-01-2008, 06:28 PM
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Quote:
Originally Posted by espo1980
Spinn,

What's the static compression ratio on that 318c.i.d. mopar?
its a 323" 4speed w/ 3.23 gears. iron cop 302 heads 1.88/1.60's 318" heads/ factory adj shaft rockers.

about 9.91

54cc 's shaved/worked
4.0? bore gasket
.028 compressed
.060 down bore


if i switch to magnum heads i will lose a little, but gain a lot.

as is , it pulls like the first 4 gears of a 5 speed 90's mustang 5.0L.
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