I'm somewhat new to engines and I was wondering, when one gets their heads ported and polished do they need to get new rocker arm's? I could be mistaken but the way I understand heads it just seems like you would if you went too big with your porting. It would also seem that with ported heads a new camshaft might be necessary. Also, another term I've seen on some other automotive sites is a Valve Job. What is a Valve Job? I'm pretty new to performance engines and whatnot and I want to learn this stuff.
Question concerning porting & polishing
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with porting you won't need new rocker arms. 4.6's don't have rocker arms anyways, they have cam followers. you might on a 5.0 for increased valve opening to take advantage of the porting. new cams also aren't necessary, but will exascerbate the effects of the port work. a valve job is simply grinding the valve pocket on the head and the valve's to ensure a perfect, leak free fit. also some valve jobs have certain angles that are performance minded.
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Theres many types of cams, all depends what you want to get out of your motor.
Do you want to stay N/A or go boost in the future or possibly nitrous. All depends.
I recommend Comp cams, Hi Techs, Cushman Motorsports, theres more some can chime in.
Do you want to stay N/A or go boost in the future or possibly nitrous. All depends.
I recommend Comp cams, Hi Techs, Cushman Motorsports, theres more some can chime in.
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856 Posts
Also a note, best thing to do is find performance shops around you. Decide who you think is the better or well known and most of the time I think its best what they use since they will know more about the parts.
Also.. I've started looking into the 4.6L and I've noticed that the traditional model of engine that I'm used to doesn't apply... I'm used to dealing with a pushrod engine with rockers and lifters and whatnot... but as has been said in this thread so far the 4.6 doesn't have rockers but has cam followers and since its a SOHC design it doesn't have pushrods either... I'm wondering if anyone knows where I can find a good diagram or exploded view of the 4.6 so that I can familiarize myself with the parts that are in my engine.
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Stock rockers/followers are fine.
Have an experienced company do the porting. Bigger isn't always better, velocity has a lot to do with the performance of the heads. I recommend over sized SS valves, bronze valve guides, 5 angle valve port, high pressure valve springs, Viton valve seals, and titanium retainers. Maybe have the heads check for small hair line cracks and any warping if reusing your own..
I bought patriot stage 2 ported stock heads with all that already done for me. The company has had problems in the past but they have since seemed to have resolved them. I have been very happy with mine. They have always made good power.
Have an experienced company do the porting. Bigger isn't always better, velocity has a lot to do with the performance of the heads. I recommend over sized SS valves, bronze valve guides, 5 angle valve port, high pressure valve springs, Viton valve seals, and titanium retainers. Maybe have the heads check for small hair line cracks and any warping if reusing your own..
I bought patriot stage 2 ported stock heads with all that already done for me. The company has had problems in the past but they have since seemed to have resolved them. I have been very happy with mine. They have always made good power.
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