[blueghoast]

Originally Posted by JLMounce

The link to the podcast is up, it’s good, go watch/listen.

He stated the intake was moved towards the center by around .080 and the exhaust moved towards the chamber edge by about .030. That was his best recollection.

He also claimed the heads will work on a 350 block as long as the chamfers are in place.

But seriously take the hour and 15 minutes to watch the podcast instead of making assumptions based on 3rd hand knowledge of people like myself.

X2

GT

[JLMounce]

Originally Posted by MatthewKlein

Is it in this thread? Or could you please post it here

It’s been posted in a previous page. Here’s another fresh link.

https://www.youtube.com/live/O5f5ASA...N397-BphQER8Dw

[Dragncar]

Not sure why special pistons would be needed. My High Ports have a 2.20 valve and generic Butler Ross pistons, 4.155 bore.

[MatthewKlein]

Originally Posted by JLMounce

It’s been posted in a previous page. Here’s another fresh link.

https://www.youtube.com/live/O5f5ASA...N397-BphQER8Dw

Thank you

[MatthewKlein]

We live in an amazing era. Can you imagine access to an interview like this with Vic Edelbrock, Mickey Thompson, Duntov or Barney Navarro

[slowbird]

Originally Posted by Dragncar

Not sure why special pistons would be needed. My High Ports have a 2.20 valve and generic Butler Ross pistons, 4.155 bore.

Your butler pistons are based on eheads. If you move the intake .080 you think the valve will still line up with valve pocket in the pistons?
That .080 plus a 2.19 intake valve is like running a 2.270 valve in eheads. How many shelf pistons have pockets for that? Guessing not many.

[jhein]

Originally Posted by MatthewKlein

Is it in this thread? Or could you please post it here

https://www.youtube.com/live/O5f5ASA...IK0UOC7Aut&t=4

[Dragncar]

Originally Posted by slowbird

Your butler pistons are based on eheads. If you move the intake .080 you think the valve will still line up with valve pocket in the pistons?
That .080 plus a 2.19 intake valve is like running a 2.270 valve in eheads. How many shelf pistons have pockets for that? Guessing not many.

The pistons have one big valve pocket that is the same one both sides of the piston and its big enough for a 2.20 intake valve on both sides.

Move that intake .080 towards the middle and there is nothing but room. And the other side is big enough for a intake valve so why would a exhaust valve hit anything ?
Am I missing something ?

[slowbird]

Originally Posted by Dragncar

Am I missing something ?

Yes you are. Not everyone runs Butler pistons. Also did you check radial clearance on your pistons? .080 is a noticeable move.
Don did a good thing by moving the valves but he might have created other issues by doing so.

[PAUL K]

Butler pistons have some of the largest valve pockets in the industry "for a reason".

If the information posted in this thread about valve sizes and relocated valve guides is correct one better be sure to check the piston to valve clearance carefully and in all directions.


A 2.11 intake valve has the potential to flow 350 plus CFM in a standard port Edelbrock head.

A 1.66 exhaust valve will support 900 plus horsepower.

[adamo]

Why doesn’t anyone ask don if they will need dedicated pistons? Or is everyone doing the liberal thing and talk and complain with out even knowing anything?

[PONTIAC LARRY]

Something else to note as far as quality details he mentions is that they will have Helicoils for rocker studs and exhaust bolt holes

[PONTIAC LARRY]

Cant wait to see the 48s flow test ! As cast model program showed potentially 320 cfm

[jhein]

Originally Posted by adamo

Why doesn’t anyone ask don if they will need dedicated pistons? Or is everyone doing the liberal thing and talk and complain with out even knowing anything?

I just posted the question in the comments for the video. He has been responding to some so we'll see,

[jhein]

Wow, that was fast. Here's his response:

"I did move the valves a little but hoping most available pistons will work. As we get things sorted out I will share that info."

[slowbird]

Originally Posted by jhein

Wow, that was fast. Here's his response:

"I did move the valves a little but hoping most available pistons will work. As we get things sorted out I will share that info."

Interesting

[adamo]

See how easy that was.

[PAUL K]

Originally Posted by adamo

See how easy that was.

Not sure if we know more now than before??

[JLMounce]

We probably won't realistically have an answer to that until the first couple castings get machined up. Don will learn a lot from that program.

He has 4 total castings right now. He intends to machine them up and work out that program. He'll then flow an intake and exhaust port on the D port and one of the round port heads. Then he intends to cut them up to make sure there's no issues with the castings, water is where it's intended etc.

I'm sure at that time he'll have a better idea whether or not there could be a piston selection issue. Given the stated goal of these heads, it probably doesn't make business sense to have these go out the door to only people that will be doing a new build at the time and can select appropriate pistons. That's my speculation anyhow.

[slowbird]

Originally Posted by adamo

See how easy that was.

He didn't answer anything.