1206…

6901…

 

 

Does AFR have that same gasket in a .120 thick?
If so that'll raise it .060 and should work then.

 

Not that I'm aware of. The other side of the manifold I could work with.

For reference, this is with the 1206 on the AFR 220 Comp head.

 

Will you move it on and try the new Trickflow that starts at 1206 already? Good to start with a product closer suited to application for us weekend guys

From Trickflow
“This intake manifold is only meant for use on high performance small block Chevrolet engines equipped with Trick Flow® 230cc heads, or comparable cylinder heads 220cc or larger that operate in the range of 3,500-7,500+ RPM.”

 

Will you move it on and try the new Trickflow that starts at 1206 already?

Lol. Yes, I will. I have no intention of touching the Holley. This thread is basically a tech bulletin. If the info was available beforehand, I would have passed on this manifold.

 

Let's compare AFR to AFR. This is the AFR 4811 Eliminator manifold.

1206 gasket...

6901...

1207...

 

I know there are quite a few guys here on this forum who have intimate experience with this manifold. I'm sure many are preoccupied with PRI at the moment. I've got a few questions. Is the poor alignment of those runners and ports normal?

 

???

 

This is one of my favorites among the dual planes. The classic 8016 Weiand Stealth...

 

lots of volume in that manifold for a dual plane . Remember those having broad power band in a street racer .

 

Not sure what the goal is by using intake gaskets as templates but the last set of small block Chevrolet heads I did, the intake ports on the heads were the pattern to port the intake to.

These DART 215 castings were done over ten years ago for a bracket 355 combination and were pretty stout back then. When doing the porting to the Holley 300-25 manifold, I didn't care what gasket was needed as they always were trimmed to fit the intake ports. Just get the manifold runners and cylinder head ports to match up was the priority.

Maybe I'm missing something with all these intake gasket sizings?

 

Not sure what the goal is by using intake gaskets as templates
Maybe I'm missing something with all these intake gasket sizings?

Tape on. Tape off. Gasket is taped to head, manifold is bolted down. Transfer tape to manifold and remove with gasket. I did this to show the position of the ports relative to the gasket on a variety of manifolds. The ports on the 300-100 are clearly out of position. It’s also the only manifold that won’t work as cast.

 

The current casting looks different.

If its anything like what Holley did with Weiand, it's probably Chinese.

 

OP, just looks like the Holley had too much material taken off the head side of the intake during mfg. A .120" thick trim to fit gasket should take care of the issue. IMO, I would start off with a bigger intake for an AFR 245 head and large cubic inch SBC. Less porting work.

Ed, nice work!

Jason G.

 

I’d like to do an on-track manifold comparison using my car as the drag mule. I’m looking to crown a top contender on a pump gas, 434 small block Chevy running up to 7500 rpm.
That Holley was a disappointment right out-of-the-box

 

It will work with a thicker gasket

 

I had another set of 1206 gaskets on hand, so I stacked two on each side. I understand the necessity to increase gasket thickness when dealing with decking and milling. That’s not the case here. It’ll “work” like that, but it doesn’t change the position of the runners traveling into the far corner of the port. It’ll still require extensive port work that may need welding on the roof.

 

This Trick Flow R-series manifold arrived on my doorstep this morning. The final nail in the coffin for the Holley. I can’t justify wasting time with that turd when there are much better castings out there.

 

I guess those 3 words cast on the manifold says it all..." Made In USA".
Very nice piece.

 

The new TFS is a nice piece design and manufacturing wise. I am gonna buy one and do it to the max to compare to the 2892 we run on our shop cars SBC....

We have had a number of 300-110s that were machined incorrectly over the past couple of years. Holley was good about exchanging them but it still sucks. I really like the design and it's been a staple for our Limited Dirt Late Model engine program but... with the QC issues, it's time to develop something new.
Will

 

The new TFS is a nice piece design and manufacturing wise. I am gonna buy one and do it to the max to compare to the 2892 we run on our shop cars SBC....

We have had a number of 300-110s that were machined incorrectly over the past couple of years. Holley was good about exchanging them but it still sucks. I really like the design and it's been a staple for our Limited Dirt Late Model engine program but... with the QC issues, it's time to develop something new.
Will

I've got a 2892 on the SBC in my drag car. I'll be comparing it against the TFS, and the other manifolds next season. The Holley was intended be a competitor, but failed to qualify.

 

Shame to hear about the Holley. About ten years ago I used them a lot and they were always great fitment wise. Power wise they would always be on top of a super vic with equal porting. Both the 300-25 and 300-110. I put the 300-25 on my personal 406 with afr 227 eliminator. Dirt cheap as well. Maybe find an older version. NOS perhaps?

 

Good luck finding an older casting. Whoever owns them knows how good of an intake they are, and rarely would part with them. Friend has a 300-25 from the mid 80's and he will not part with it, it is just sitting on his shelf.

 

Full Factory Tour: How Edelbrock Makes Its Cast Aluminum Parts

Edelbrock has been making aluminum castings in the United States since 1938. But few people know how these cast components are created.

www.enginelabs.com

 

To be fair, Holley says the 300-110 is "Ideal for classes that require cast iron heads that require an unported intake manifold."
I don't have a 1204, but it looks good with a 1205. Shouldn't be a problem with smaller port heads.

For reference, here it is with a 1207.

Right bank...

Left bank...

 

I've got a Holley Strip Dominator 300-25 on the bench. This one also has core shift in the runners, but it's workable...

 

Where did you find this one? Just wondering....

 

- YouTube

Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

youtube.com

 

Have you considered opening up the plenum like @Chad Speier does on some manifolds or is it not needed?

 

Yup -

 

For all intents and purposes, I'd like to run it with a 4150 carb and a Wilson 1" tapered spacer.