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I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.

Anyone have experience with this cam & spring combo during break-in? Opinions?

Thanks.

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Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better

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I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.

Anyone have experience with this cam & spring combo during break-in? Opinions?

Thanks.

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Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better

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I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.

Anyone have experience with this cam & spring combo during break-in? Opinions?

Thanks.

---

Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better

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I assume you have a solid lifter cam..??
His pressures are fine and the cam lift is in the post. As long as you break it in with 30 wt Brad Penn or equal oil your fine. Then change out oil to the wt oil of your choice as long as it has Zinc and phosphur.

MLR426

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I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.

Anyone have experience with this cam & spring combo during break-in? Opinions?

Thanks.

---

Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better

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I assume you have a solid lifter cam..??
His pressures are fine and the cam lift is in the post. As long as you break it in with 30 wt Brad Penn or equal oil your fine. Then change out oil to the wt oil of your choice as long as it has Zinc and phosphur.

MLR426

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It's a hydraulic lifter cam. I'm using Brad Penn 30wt break-in oil with a bottle of Comp Cams break-in oil additive.

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I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.

Anyone have experience with this cam & spring combo during break-in? Opinions?

Thanks.

---

Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better

---

I assume you have a solid lifter cam..??
His pressures are fine and the cam lift is in the post. As long as you break it in with 30 wt Brad Penn or equal oil your fine. Then change out oil to the wt oil of your choice as long as it has Zinc and phosphur.

MLR426

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It's a hydraulic lifter cam. I'm using Brad Penn 30wt break-in oil with a bottle of Comp Cams break-in oil additive.

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It should still be fine, closed load isn't the killer, it's open load pressures that kill. I would have like to see the open pressure under 300. Good oil is the a must especially after the break in.

MLR426

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Thanks for your help!

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