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GT40 Tech - Engines/Induction/Exhaust Motors and engine related - right here!

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Old 5th January 2018, 05:48 PM   #1
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Smile max safe revs from a 302

Just wondering... I bought the car a while back, and cannot get detailed info on the engine internals. Moderate power (250), 4-barrel Holley, conventional valve gear. Of course max revs will go well past peak power, but on our lovely deserted Scottish roads :-), I'm just wondering how high I can permit this engine to rev? For what its worth, its an ex-Torino motor, ie not a marine derivative!
Thanks...
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Old 5th January 2018, 05:57 PM   #2
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Re: max safe revs from a 302

Hi Pete, I thought 6000 was relatively safe, but use 5500 as a general limit which is exciting enough for me😁 When I had the old cast iron heads, the valve train was not so happy up there.
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Old 5th January 2018, 07:18 PM   #3
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Re: max safe revs from a 302

Thanks Dave, but I KNOW you have some neat valve gear under those valve covers!
Peter
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Old 2nd March 2018, 04:36 AM   #4
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Re: max safe revs from a 302

Hi Peter,

The 302 can rev easily up to 8K rpm, with the right parts and setup. I used to build them all the time when I was building Mustangs. I also built a 351C 4V which revved to 8500 without too much trouble, it could rev higher but I didnt see it safe for the engine. Beyond this there is no point.
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Old 2nd March 2018, 05:37 AM   #5
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Re: max safe revs from a 302

Given the OP's original post any attempt to run it at 8k will require a large drip tray, probably sooner rather than later....
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Old 2nd March 2018, 07:30 AM   #6
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Re: max safe revs from a 302

It all depends on the valvetrain. If it is a solid lift cam, flat tappet or roller, you're better able to minimize valve float at higher rpm's and continue to have good power. Even a hydraulic roller will start to float the valves around 6500 rpm's. And you'll hear it.
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Old 2nd March 2018, 09:36 AM   #7
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Re: max safe revs from a 302

The older 302s usually started seeing valve float issues above ~5500. I believe the rotating assembly is good for ~6000. Considering the "moderate" power value you've provided, it sounds OEM, so I'd stay below 6K. Any modifications (improvements) to the valve train would probably push the limit up to the OEM rotating assembly limit, which would be safe at 6K for sure, and pushing it at 6.5K.
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Last edited by blueovalz; 2nd March 2018 at 12:45 PM.
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Old 2nd March 2018, 10:20 AM   #8
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Re: max safe revs from a 302

Quote:
Originally Posted by DC40 View Post
Hi Peter,

The 302 can rev easily up to 8K rpm, with the right parts and setup. I used to build them all the time when I was building Mustangs. I also built a 351C 4V which revved to 8500 without too much trouble, it could rev higher but I didnt see it safe for the engine. Beyond this there is no point.
That sounds great, really, I bet it does.
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Old 13th April 2018, 03:07 PM   #9
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Re: max safe revs from a 302

Been away, and just caught up on some later contributions, for which I am very grateful. Most helpful - thanks all! Happy to report my use is well clear of the danger zone...
Peter
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