Extrude hone intake & exhaust manifolds?
- Thread starter Dan B
- Start date
Thunder_Lloyd
Active member
removing the intake and exhaust should be pretty straight forward. I am unfamiliar with what extrude honing is tho...
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Dan_Austin
Member
I considered it while building a fresh engine. The intake and exhaust already flow better than the stock heads, so there isn't much benefit. If you can get it done for free, you might see some improvement in spool response from having the exhaust manifolds done, otherwise there are better parts of the truck to spend money on...
What got me thinking of it was I was considering removing them for cerakoting anyways, def pricey though.. I had a stock motor rebuild on my old 87 turbo t, previous owner had the intake extruder honed, my engine builder who had done a ton of turbo buicks kept telling me how nice the manifold was inside
When I look under the hood it's a bit daunting, not sure where to begin lol.. Extrude hone though is a process where they hydraulically inject an abrasive putty through all the passages resulting in a really smooth surface in theory making better air flow
djsy934
Active member
From my understanding, a slightly rougher surface is better for a lower intake as it helps atomize the fuel. (see pics of my lower porting) This is the same when I ported my heads, I left the intake ports a little rougher but polished the exhaust ports smooth.
As for the stock exhaust manifolds all I did was port match, I'm told the stock manifolds are good for up 700hp. Not sure how much extrude honing will add.
As for the stock exhaust manifolds all I did was port match, I'm told the stock manifolds are good for up 700hp. Not sure how much extrude honing will add.
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Here is another theory.. They have there's you have yours I'm not in a position to say which is right/wrong, just posting for discussion.. Nice job with your parts I hope to get as involved with mine someday.
Not sure if this adds any insights... https://howtune.com/articles/43-port-matching-the-turbo-on-a-gmc-typhoon
Intake isn't bad coming off, make sure to label all the connections. Exhaust is just tight...always easier on a lift if at all possible. Lot of back and forth when it's on jacks that makes it hard.
Intake isn't bad coming off, make sure to label all the connections. Exhaust is just tight...always easier on a lift if at all possible. Lot of back and forth when it's on jacks that makes it hard.
On port injected motors, like the Sy/Ty, there is no fuel in the intake ports, that would need help antomizing. If you're worried about the fuel atomizing, get better injectors
Good advice thanks.. I may just swallow my pride n have my mechanic friend do the r&r in his shop, I'll slap in a few led fixtures n call it a wash.. far as the turbo porting yes sir all part of the plan, I just worry I'm gonna live to regret Dave P's sage advice of leave it the fuck alone lol
On that note.. I realize the factory (30 lb?) Injectors are perfectly matched for a stock setup, but do the new 42's that are available perform (atomize) any better? Disk vs pintle etc
Pintle injectors have better spray pattern then disc injectors, but are more prone to lock up, when running them on higher fuel pressure
corsair231
Active member
Consider 60 lb injectors. From what I understand is they have better idle and drivability than the 42's and the 255 should be enough pump for a street setup, plus they will give you room to grow in the future. Of course, what do I know since I'm running 50 lb'ers, lol.
corsair231
Active member
It's my understanding from talking with Eric at Turbotweak that it is more than just greater fuel flow capabilities from the 60's over the 42's. It may be all from the chip writer/tuner's end, but I trust his advice. There have been a bunch of people who were happy with the 42's though so either one will be an okay choice. The only reason I didn't go with the 60's this time was the great deal I got on a set of low mileage 50's and a chip from a couple of guys from the sites. Got to save a dollar when ever I can, lol.