[rolling money pits]

Thanks…

Reading about other heads and the associated guideplate machinations, fiddling, welding, etc., it’s nice to see it seems he’s making that end an easy out.

[jhein]

To me, this is a no brainer. I know there are still a lot of unknowns but the Youtube video that he made shed a lot of light. If these heads were available when I did my motor, that's what I would have used, Even if they had the same performance as Edelbrock or KRE out of the box, they still win based on looks alone. If the performance is better then it's just not even close.

My only worry would be that it the Pontiac community started using these instead of Edelbrock or KRE, then maybe those would eventually die leaving us with only one source for aluminum heads. Which could be fine, unless or until something happens and these disappear too.

[Skip Fix]

The Mopar guys have a stock looking aluminum head-even tested on Engine Masters I think against some others. Friend has a set on his 500 inch "383".

[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.

[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.

[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.

[Dragncar]

Originally Posted by slowbird

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.

I ran it all by Jeff at KRE so he knew exactly what pistons I was using. I did check piston to valve with a soft spring with the cam when it was a .447 lobe and it was fine. Then I had it re ground to a .431 lobe so the clearance got even larger.

[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.

[Dragncar]

Originally Posted by 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.

Oh I get it. its cheaper for them to buy and it leaves more room for guys making mistakes.
I bought them a LONG time ago and to tell you the truth I wish I would have bought newer more modern pistons. I swapped out the crank and rods from the original plans anyway.
They are 1/16 rings, back cut with gas slots and those spacers, big pain.
I wish I would have bought pistons with int/ex reliefs and metric rings. Has to be a little more power going that route.
I could have cut my heads a little less to get the CR I was after with new pistons.
But so far so good with the engine.

[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]

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,

[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

[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??

[jhein]

Originally Posted by PAUL K

Not sure if we know more now than before??

Yep. He said "we'll see". Sounds like his goal is for standard pistons.

[PAUL K]

Originally Posted by jhein

Yep. He said "we'll see". Sounds like his goal is for standard pistons.

Shouldn't be hard to make that work. The blueprint was drafted more than fifty years ago.