Wow this thread is starting to sound like the varsity cheerleading team locker room , ( everyone's ****** is starting to hurt).
The real deal is flat tappet cams are a great way to go on a budget and last many miles with the right break in and oil , (as we all know). If your flat tappet cam is providing the most of your engine's potential , (cylinder pressure , crappy head flow , etc.) the power gain will be not much by going to a roller , (little bit). Now on the other side of the fence, my girls truck that we built has 10 to 1 comp. ported 202 heads , decked .040 quench , harland sharp roller rockers , crane springs , locks and retainer's ,(last longer in sprint car's) hardened seats , comp 270 roller cam , all bolt on's , etc..... and it get's it on like a scalded dog , 4.11 gear's , 35's.
That being said the extra money and time was major , roller cams have faster ramp rate's and higher lift's , (more area under the curve) , which means a power increase , but there is a lot more to it than just the cam, (which the cheerleading team forgot to mention).If you want to keep a mechanical fuel pump you will need a an aftermarket pump push rod to prevent wear on a steel cam , shorter push rods , better valve springs , distributor gear,(if your cam does not have a soft iron gear on it) , cam button , stock timing chain cover no good because of flex , new timing chain cover , (I ran a cloyes cover with button built in) , (I also ran a cloyes timing chain with a torrington bearing in it) , all because you have to set the cams endplay and that all costs money and work.
Shift pro , that engine has 36,000 miles on now and it is a daily driver and it has been perfect so far so I dont know the longevity of this engine , we will see, ( we dont baby it either).
So I think on a basically stock engine, (with the wish of a 150 hp. miracle cam) with stock heads you are better off to run a flat tappet cam, (save money ,roller not worth it) If you are building a bad ass motor to tear some **** up , I think I would go with a roller cam, (just me).
Here is a pic of her bad ass roller motor truck to cheer you guy's up.
It will bake 35's as long as you want to!!!!!!!!!!!!!!!!!!!!!!
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