[AG]

Originally Posted by 70 bird

How much did that work of art set you back?

I think it was $3200 shipped from coast to coast. I got the first set of bare CNC chamber 72 cc Eddy heads he got his hands on, had to wait over a year to get them from Edelbrock. He CNC ported them to 338 cfm at 0.700" lift set up for a HR cam and use his small spring package and tool steel retainers.

[AG]

Pics

[70 bird]

They look Nice! thanks.

[NeighborsComplaint]

Originally Posted by ID67goat

Man, that guy is a little rough on the equipment....

If I saw my heads being removed from the box like that, I would be packing them up and heading back out the door regardless of how good he thinks he is.

[Formulajones]

You guys are a little overboard. I've seen nothing he's done that matters. The fact that he'll be completely going through the heads to a finished product makes how he removes them from a box a moot point.

[Murf]

Originally Posted by Formulajones

You guys are a little overboard. I've seen nothing he's done that matters. The fact that he'll be completely going through the heads to a finished product makes how he removes them from a box a moot point.

He held the knife wrong!


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[ZeGermanHam]

Agree that nothing of consequence occurred, but flippant behavior is never something you want to see in a mechanic or machinist.

Anywho... I'm a total novice when it comes to cylinder heads. Does the photo AG posted above of the combustion chamber show anything that is noteworthy? To my entirely untrained eye, the machine work looks rather crude.

[AG]

The combustion chamber is CNC machined by Edelbrock with some smoothing around the spark plug hole by Dave B. Could be an artifact of the pic, but in person it looks excellent.

[Formulajones]

Originally Posted by Murf

He held the knife wrong!


Sent from my iPhone using Tapatalk Pro

lol

[mgarblik]

Thanks for the video. I especially liked it because he was using the exact same Sunnen seat and guide machine I have and the same runnout gauge. It's a little clunky and out dated, but does a decent job. Much better equipment is out there now. Serdi makes nice stuff among others. I shoot for .0005-.001 seat runnout. That's about as good as I can get with the 20+ year old equipment and the worn pilots. We like to consider the Sunnen equipment "student proof" and it is pretty tough. It's belt drive vs direct drive so pretty hard to badly crash. Serdi machines are very delicate, but accurate. BTW, I have found AFR heads to be among the best aluminum stuff I deal with, Edelbrock, middle of the road, and Chinese aluminum heads can be pretty rough. In the video he took .003" off the seat to clean it up. I have had some new Chinese stuff need .010-.012 to make it right. You do what you have to do to make the stuff usable. Once it's purchased, you are kind of out of options.

[Formulajones]

Excellent post Mgarblik. I wasn't going to post this next video but your comments are spot on and makes this next video just as important for this thread.

https://youtu.be/Be89NmuD2kY

[mgarblik]

Good video as well. The guy knows what he is doing IMO. Everyone does things a little different, but I personally would not put aluminum Scorpion rocker arms on a 600 HP BBC. I have seen way too many problems with them to send one out with those on it. I just finished a BBC that failed several of those and did quite a bit of damage. I like steel rockers for anything doing street time. The guides, studs, and valve guides don't surprise me. He put CHE valve guides in. They are about as good as you can get. Actually all the parts sounded good except the rocker arms. The HP numbers and torque numbers were actually inflated probably by the very fast 600 RPM/sec they made their runs at. Zinging the engine up quickly like that produces bigger numbers on the dyno. Good for bragging rights I guess. We run most of our pulls at 300 RPM/sec. Make the engine work a little. If your scared to run your engine for 10 seconds at WOT, you should probably not be building them for a living. 3000-6000@ 600 per second is only a 5 second pull. I have pulled some of our Pontiacs from 2500 -7500 RPM's @ 300 RPM per second. That's a good workout at almost 17 seconds WOT and load.

[mgarblik]

Couple little mistakes on previous post.. As I was proofreading it, I accidentally posted it. I meant to say the guy in the video probably cheated himself out of a little HP with his acceleration rate of 600 RPM/sec. The more standard rate of 300 RPM/sec will produce a little more HP on the dyno. This is because it takes a little more HP to accelerate quickly. Regardless, I like to make the engine work on the dyno. Part of the process is to fully seat the rings and break everything in. Sorry for the confusion. For some reason I was not able to edit my previous post.

[NeighborsComplaint]

Originally Posted by Murf

He held the knife wrong!


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Do you throw bolts and wrenches at your brand new heads or just at customers' heads?

[Murf]

No and I didn’t see him “throw” anything either. If anything he did in the video hurt those heads, they suck.
I do apologize for my flippant remark.. I didn’t think it would be big of a deal.

Murf

[Formulajones]

Originally Posted by mgarblik

Couple little mistakes on previous post.. As I was proofreading it, I accidentally posted it. I meant to say the guy in the video probably cheated himself out of a little HP with his acceleration rate of 600 RPM/sec. The more standard rate of 300 RPM/sec will produce a little more HP on the dyno. This is because it takes a little more HP to accelerate quickly. Regardless, I like to make the engine work on the dyno. Part of the process is to fully seat the rings and break everything in. Sorry for the confusion. For some reason I was not able to edit my previous post.

Mark has a pretty good reputation around the Colorado area and is known for making HP. He usually builds those BBC street engines with factory iron oval port heads that he does his work to and that same engine will make 620+ HP and nearly as much torque, and doing it with a pretty small 230-something @ .050 camshaft. Considering he only squeaked out 604 with those aluminum heads after a bunch of port work kind of explains a lot too.

Oh and I agree, Scorpion rockers never end up on any of my engines, ever.

[Murf]

Getting back on the subject of Speedmaster heads. �� What do you guys think about the 2 core plugs inside the valve cover area? Would you tap them for pipe plugs? They are in the water jacket, aren’t they?

Thanks
Murf

[Jim Moshier]

Curious if the guys running these heads are having the same oil drain back issues as the Edelbrock heads when they came out or if they are opening up the holes to alleviate it? They look good from here and price is right, I have not heard any really bad issues just growing pains as all the Pontiac heads have gone through.

[Mike Davis]

Originally Posted by Jim Moshier

Curious if the guys running these heads are having the same oil drain back issues as the Edelbrock heads when they came out or if they are opening up the holes to alleviate it? They look good from here and price is right, I have not heard any really bad issues just growing pains as all the Pontiac heads have gone through.

They are similar to the later Eheads that don't have as much of the issue.
But very easy to remedy with a sandpaper roll to lay the opening of the drain hole back

["QUICK-SILVER"]

many birds,

What round port exhaust manifolds or headers are you planing to use and have you done bought them?

If you're doing round port manifolds, I would definately get mandrel bent head pipes to get all the goody you can from the head swap.

Clay