Heads ported, is it ok that they went into the rocker arm bolt area???
09-26-2010, 01:56 PM
#1
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Heads ported, is it ok that they went into the rocker arm bolt area??? CFM Performance ported and polished a pair of 241 casting heads they had for me. I just today got to a point where I could put them on and do a piston to valve clearance. Like normal, I check the threads to make sure they are clean, even with these being very clean to begin with.
I look down the #1 intake rocker arm bolt hole and see that half of the end is gone. I then realize that during the port job each intake rocker arm bolt hole in the heads are cut into???
I don't think this is part of the head design but a product of the port and polish. Could someone post if their 241 casting head (stock) has a hole in each intake port coming from the intake rocker arm bolt hole?
Thanks so much!
I look down the #1 intake rocker arm bolt hole and see that half of the end is gone. I then realize that during the port job each intake rocker arm bolt hole in the heads are cut into???
I don't think this is part of the head design but a product of the port and polish. Could someone post if their 241 casting head (stock) has a hole in each intake port coming from the intake rocker arm bolt hole?
Thanks so much!
09-26-2010, 03:03 PM
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Just make sure you use a thread sealant on the rocker bolts to prevent oil from dripping into the ports.
If you want some more peace of mind, this is a picture I used when I was porting my own heads, that include self-ported and professionally ported heads.
http://i29.photobucket.com/albums/c2...g?t=1285531307
As you can see, all thee bosses have been cut into.
09-26-2010, 04:53 PM
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I just dont get the point in porting the runner till you open the rocker bolt hole up in doing that you should cut the bolts down so there isnt any thing sticking out in the runner and use a real good sealer ...gas is spraying/flowing thru those runners and will eat everything
09-26-2010, 08:06 PM
#7
I just dont get the point in porting the runner till you open the rocker bolt hole up in doing that you should cut the bolts down so there isnt any thing sticking out in the runner and use a real good sealer ...gas is spraying/flowing thru those runners and will eat everything
if you look at a stock un-ported set of heads, you will see a "lump" smack dab in the middle of the runner wall that sticks out about a quarter of an inch. that KILLS flow in that area and creates turbulance. removing that "lump" improves flow dramatically and decreases turbulance.
the reason that lump is there is to keep the rocker bolt hole blind, removing the lump exposes it. but as long as you use good thread sealer, there will be no problems, only improved flow and less turbulance.
look at any set of professionally CNC ported stock heads, (TEA, TSP etc...) and you will see the exact same holes exposed.
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11-10-2010, 09:20 PM
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Sorry for the late reply but unfortunately looking further into the port i noticed some stray metal pieces at the end of the bolt hole. Fortunately I caught that and removed them. Then i had to remove all the valves to clean out the stray metal pieces that were on top of the valves 
Attention to detail may have just saved my engine lol. Thanks for all the replies everyone!
Attention to detail may have just saved my engine lol. Thanks for all the replies everyone!
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