to port or not to port?
#1
to port or not to port?
i need some advice on porting and polishing ,after doing some research about it i knew it wasnt something i should do my self so i called the local machine shop and was told that i shouldnt have 455 oldsmobile heads(j)ported or polised because he said they were just as good stock.now i had always thought that better airflow was better.is what hes telling me true ? thank. you
#2
i need some advice on porting and polishing ,after doing some research about it i knew it wasnt something i should do my self so i called the local machine shop and was told that i shouldnt have 455 oldsmobile heads(j)ported or polised because he said they were just as good stock.now i had always thought that better airflow was better.is what hes telling me true ? thank. you
#4
porting will help but if the person does not use a flow bench he may do more harm than good. i like mondello but i don't always agree with him, on this issue i do fully agree with him. read some of mondellos info on oldsmobile heads. he won't steer you wrong. i have seen many people wast big money on porting and had no gain or even negative gain because they used a shop that did not know what they were doing.
#5
porting will help but if the person does not use a flow bench he may do more harm than good. i like mondello but i don't always agree with him, on this issue i do fully agree with him. read some of mondellos info on oldsmobile heads. he won't steer you wrong. i have seen many people wast big money on porting and had no gain or even negative gain because they used a shop that did not know what they were doing.
#6
Don't bother porting heads if you aren't going to frequent the drag strip. Find yourself a set of C or Ga heads and you will be fine. The Js are more restrictive than others but flow fine for a street car.
#8
He can be found at the Mondello Technical School in Crossville, Tennessee.
Norm
#11
I am throwing a wrench into the works here, still on topic at least. I read a long thread over at ROP discussing porting/polishing the heads and on the subject of polishing this came up. Polishing the heads makes for a smoother surface which does not necissarily (sp) make for better air flow. Something about fluid dynamics and all......A few posters on that thread claimed to be engineers and to know what they were saying. I don't recall what the final say was on that, as if there can be with a discussion on the internet. I don't really want to instigate an argument here but know our members won't do so but, just wondering if anyone else heard of this before. For me anyway, I don't worry about it because I don't race and doubt that I could reap the benefits of it even if it is a good thing to do.
#12
I am throwing a wrench into the works here, still on topic at least. I read a long thread over at ROP discussing porting/polishing the heads and on the subject of polishing this came up. Polishing the heads makes for a smoother surface which does not necissarily (sp) make for better air flow. Something about fluid dynamics and all......A few posters on that thread claimed to be engineers and to know what they were saying. I don't recall what the final say was on that, as if there can be with a discussion on the internet. I don't really want to instigate an argument here but know our members won't do so but, just wondering if anyone else heard of this before. For me anyway, I don't worry about it because I don't race and doubt that I could reap the benefits of it even if it is a good thing to do.
#13
Yes, I have. In regards to polishing I heard you polish the exhaust but not the intake the rougher finish on the intake helps with the air and fuel mixing. I also have the mondello book and it shows basic porting etc but do we really need that on the street? If so perhaps grab a set of aluminum heads, weren't there ports designed by Mondello?
I think in this day and age (for street vehicles) to run a vehicle everyday or regularly we really need to lower the compression, perhaps retard the ignition to factory settings etc and generally can not whoop on our vehicles the way we did in the 70's LOL.. for racing or guys who run there cars occasionally on the street or with additives fine, but for stop light bandits? hmmmmm I think I will match the ports, but that'll be about it, I have a set of c heads and a 69 455 that will be going in my cutty.
I kinda agree with Joe, who to get to do it? and is he equipped? I am having a hard enough time finding a guy I trust to rebuild oldsmobiles LOL...
#14
Basic bowl cleanup, and a 4 angle valve job, will deliver the most bang for the buck.
No. He was involved in the early stages, but the R & D was done by an Edelbrock engineer.
http://www.urbandictionary.com/define.php?term=cutty
Depends on your goal and your budget.
Norm
#15
Ohhhhh Lawdy I had no Idea!!!
geez who can keep up with all this.....
well the next time that ol' bat down the road asks me if i am interested in her 62 cutty I NOW know exactly what she means!!! DAT WENCH!!
#16
#17
I checked into porting by mondello, doing it myself etc. What I decide to do was buy a set of Edellbrock aluminum heads. The story does not end there because the heads need to be gone through buy a profesional to make sure there lapped correctly etc. I found out the hard way with three rebuilds that I had done buy somebody who I was recomended too. Will start with the distributor oiling plug missing on the first one. Thats another story. Buy the time you port I found it was less expensive to go aluminum. I still have my original heads and intake. The increase in HP is pretty significant. I am running 500hp at 10.5 to 1 compresion and 530ftlbs torque. It makes power at about 5200 rpm which is well in range of where I expect to shift. The added benefit of aluminum heads is you can run 94 octane. Nice talking to a guy in Windsor On. You are just across the river.
tim72
tim72
#18
Go to the bottom of page 2 and give this man a call.
Smitty! He is in Ohio, so he's close to you.
http://72.22.90.30/phpBB2/viewtopic.php?t=44670
http://72.22.90.30/phpBB2/viewtopic....234&highlight=
BTW his CNC edelbrock's flow 325/214 @ .600 lift.
MORE if you have more lift.
BTW your shop just does not want to deal with it.
Jim in Phx.
Smitty! He is in Ohio, so he's close to you.
http://72.22.90.30/phpBB2/viewtopic.php?t=44670
http://72.22.90.30/phpBB2/viewtopic....234&highlight=
BTW his CNC edelbrock's flow 325/214 @ .600 lift.
MORE if you have more lift.
BTW your shop just does not want to deal with it.
Jim in Phx.
Last edited by Warhead; April 6th, 2009 at 05:06 PM.
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