Awest623
A juicy girl got me, again
Well you just more than doubled the price I had in mind. Lol. Oh well. It ain't about if I can afford it. It's about how long I gotta save
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Cam Swap Help
- Thread starter Awest623
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The real point of running roller rockers is the decrease in friction and temperature from the roller bearings (not the ones on the tips of the rockers that actuate the valves). The increased ratio from 1.5:1 to 1.6:1 adds a very nominal amount of lift at the valve, and a similar nominal amount of "duration" under the curve being driven by the cam lobe profile. All else the same, sometimes adding 1.6:1 rockers yields no noticeable performance differences. Example a buddy's sbc powered drag nova with 280H comp magnum cam. He ran the same 60', same mph and same ET's with either 1.5 or 1.6 rocker arms. I never ran my truck with the 395 cam and 1.5's so I don't honestly know if the 1.6 scorpions helped performance or not.
If you feel like you need the 1.6:1 rockers, and can't swing buying the scorpions, there are stamped long slot narrow body 1.6:1 rockers out there.
https://karlperformance.com/i-24718...s-1-6-long-slot-late-model-self-aligning.html
Awest623
A juicy girl got me, again
Should I be worried about the friction and temperature with such a mild cam? Also, if I replace the rockers do I HAVE to replace the springs? The engine only has about 25k miles on it
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Awest623
A juicy girl got me, again
Btw. Keep up the good work man. I've seen you around the forums and you've had a lot of good stuff to say so Imma trust you more than most people on here. Is there any disadvantages of going with bigger ratio rockers? I know this is a truck, and I'm putting a cam in it, but I'm still trying to think about economy a little. If the rockers will make me lose 1 mpg for a 5hp gain then it just ain't worth it to me. I'm an 18 year old working a part time job so I can't throw away mpg that easily. I do realize the cam will probably make me lose a little but I'm ok with that.
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You don't have to worry about friction and heat. It's more like less energy getting consumed by the engine means it has more to output, and less heat means more efficiency to an extent.
That engine will run great without bigger rocker arms.
Good question. More cam and more rocker arm means more air and fuel. You'd make more power which means less work to do the same job but there is a critical mass where increasing power just translates to less efficiency. You would be nowhere near the ragged edge of power and economy. The biggest piece of the puzzle for economy with you will be if you can keep your foot out of it after you feel how nice it accelerates.
Post any other questions you have. We will answer the best we can.
That engine will run great without bigger rocker arms.
Good question. More cam and more rocker arm means more air and fuel. You'd make more power which means less work to do the same job but there is a critical mass where increasing power just translates to less efficiency. You would be nowhere near the ragged edge of power and economy. The biggest piece of the puzzle for economy with you will be if you can keep your foot out of it after you feel how nice it accelerates.
Post any other questions you have. We will answer the best we can.
Awest623
A juicy girl got me, again
Thanks man. For the rockers, will there be any noticeable difference between roller or normal rockers? I know for a high performance engine every little bit counts. But for a slightly above stock, dd engine is there any significant real world advantage? And one last question, I have found a good instructional video for the cam swap. But are there any special tools I need (harmonic balancer remover) or can I get it all done with my mass of regular tools?
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Awest623
A juicy girl got me, again
Ok. Thanks for all the help. I think I'll be installing that cam and the cheap rockers. Save the fancy rockers for later. It'll probably be about a month before I get started on this. But I'll make sure to give an update on this thread. One last question (I mean it this time, lol), would it be safe to run this cam without a tune for a couple weeks? Or should I not drive it much until I have it tuned?
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Supercharged111
Truly Awesome
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I'm running Comp Pro Magnum 1.6:1 roller rockers with the Marine cam and stock springs. Same springs that the ramjet engine came with, but I did install new valve seals and put them on all the way down for adequate seal to retainer clearance. IMO no use in going to a roller rockers if you're not going to increase lift. On the LT4, GM found the stock rockers didn't gall until north of the LT1 redline which is well north of where a Vortec runs.
