Extrude Hone? or the BAND SAW!?!?

[gtsr515]

Anyone ever tried to whack the stock intake in half and port it and reweld?, i know it was done a bit in the late 80's to 90's be fore extrude honing.

like FORD say's...HAVE YOU WHACKED YOUR INTAKE?.....LATELY?

[Unit 5302]

Yep, it's been done. They cut the intake apart and epoxy it back together. Don't know why you'd bother though. To have a professional do that is more expensive than getting a used Cobra or Explorer, which will flow good.

Extrude honing helps the stock intake a lot, but you're never going to see the flow an aftermarket intake would give you, and it's more expensive.

[gtsr515]

Oh I agree, I dont want to do it, just wondering about others success, I never heard of epoxying it back though, whatever works right?

[Green9550]

Dude, I might be a little biased, but I would say extrude hone all the way. The result is AWESOME. I couldn't believe how well my intake turned out. I also gained 100cfm from an unported Cobra intake. Those are great #'s. I know it is expencive, but if you can afford to have it done, it is worth every penny. Also, it doesn't look like anything has been done to it, very stealthy. Oh well. Good Luck on your decision. Take it easy.

-Billy

[Five0]

That is what I did on my 88 gt only I did all the work except the welding. (no epoxy) It worked great for me and I did it because I wanted to have every thing look stock.

We smothed the welds out and polished the intake. When it was done you would have to look really hard to even know it had been done.

[Unit 5302]

There have been head to head comparisons. You can spend $600 having a full extrude hone job done and get a little less flow than an Explorer manifold, which flows a little less than the GT40 and Cobra intakes.

[Green9550]

Unit, what are you trying to say? I sent my intake to extrude hone and got 100 cfm more out of the intake. 305cfm on the lower and 302 on the upper. Those are AWESOME #'s. The only reason I wouldn't cut the intake would be because it looks ugly. You can't tell if an intake or heads has been extrude honed or not. I would definitely pay for it again. Good luck on the decision.

-Billy

[red82gt]

I think Unit was referring to the stock HO intake, not a Cobra intake. You'll do better with a stock Cobra or Explorer than with an Extrude Honed HO intake.

[Five0]

Actually I read in 5.0 magazine a couple of years ago that they tested and extrude honed and retested several intakes and they found that the extrude honed stock intake out flowed the non extrude honed cobra intake and had a better runner balance of all the intakes tested.

After the extrude honed the cobra intake it did flow more than the stock one but they did say they could have even removed more material if they wanted. They also said that the stock extrude honed intake was a very good intake.

I will agree that you can do better than the stock intake but if you are going for the stock look or do not have the money for the extrude honed or after market intake and know how to hand port it that it will work good if done right.

[Dark_5.0]

An extrude honed stock HO intake will out flow the cobra or the explorer manifold out of the box. since the holly intake was released everything else is second rate anyways.

But if you are building a sleeper its worth the cash to me.

Later,

[Unit 5302]

The last head to head article I saw was in a MM&FF magazine several years ago. The extrude honed stock intake did NOT outflow the Cobra. I'll have to dig up the article and double check.

100cfm out of extrude honing? I'd have to see it to believe it. Extrude honing doesn't take much material out. Just smooths out the casting.

[Dark_5.0]

I dont know if you have ever seen an extrude honed intake or not UNIT but it takes "A ***** LOAD" of material out. After extrude honing there is no room for porting. It cost $600.00 for a reason, I would much rather have a stock extrude honed intake than the one I got.

After I bought my intake I seen an extrude honed stock intake. The runners on it were way bigger than the runners on my GT-40 and were smooth as glass.

I was impressed
Later,

[Five0]

Also extrude honing takes material out if the places it needs to and not in the places it does not.

It acts just like air taking the same path the air wants to take.

It does remove a crap load of material too.

I have to agree with Dark_5.0

[red82gt]

The last head to head flow test I saw, the stock intake with extrude honing only flowed ~200 cfm per runner, it did do wonders for evening out the flow of all the runners (all were now within 5cfm) the low cylinder on the GT-40 flowed 215, after they straightened and welded the runners it did like 250+CFM. The design of the GT-40 is also superior to the stock intake, no matter how big you make the ports on the HO intake. But then again, don't believe everything you read.

[Coupe5oh]

I met a guy at the track, with a stock intake and 69 windsor heads running a ported h.o intake, he said he had 800$ into the porting, and i saw him rip off a 11.3 with a 100 shot, 12.6 on the motor, also he said his intake outflowed the cobra, im hoping to port mine, does the intake have to be cut to extrude hone the h.o? just curious, im not really going to spend that much

[Five0]

No it does not have to be cut.

They bolt it up to a machine that pushes an abrasive material through it and it removes material as it goes.

[Mach 1]

Ill throw my .02 in.

I have no personal experience with extrude honing, but my Brother in Law, who has a Doctorate in engineering was sporting a coffee cup that had a "extrude hone" logo on it. Its now in my possession.

Anyway, to my suprise, when I questioned him about the coffee cup, it turns out he designed thier equipment and worked on the process with them. They contracted his company to help them design the process.

I asked him about it, and all he said was "It doesnt work as good as they say it does". Take that for whatever you think its worth.

later