427 Ring Gear, OUT!

[ERA Chas]

I have spoken to Barry in the past about this and for serious power he prefers to slightly modify Art Francis' Blue Thunder castings.

They're how it got him over 700 on pump gas.

My out of box CNC'd Shelbys are 320/230 @ .600 (which is where my cam works) and they clearly out perform my ported iron Med. Risers which had 2.250's and 1.75's.

Ring gears? We ALL got stinkin' ring gears!

[RodKnock]

Originally Posted by ERA Chas

I have spoken to Barry in the past about this and for serious power he prefers to slightly modify Art Francis' Blue Thunder castings.

They're how it got him over 700 on pump gas.

My out of box CNC'd Shelbys are 320/230 @ .600 (which is where my cam works) and they clearly out perform my ported iron Med. Risers which had 2.250's and 1.75's.

Ring gears? We ALL got stinkin' ring gears!

Isn't the only issue with the BT heads, the raised exhaust ports and thus a revision to the headers and exhaust?

[ERA Chas]

Originally Posted by RodKnock

Isn't the only issue with the BT heads, the raised exhaust ports and thus a revision to the headers and exhaust?

Yes that's true but if I had Barry's motor I'd gladly change my head pipes and collector to work with them.

The Shelbys have an exhaust port floor raised .250" so that does not change pipe requirements. The raised floor really helps out the exhaust side.

[RodKnock]

Originally Posted by ERA Chas

Yes that's true but if I had Barry's motor I'd gladly change my head pipes and collector to work with them.

The Shelbys have an exhaust port floor raised .250" so that does not change pipe requirements. The raised floor really helps out the exhaust side.

What little I do know, I'm aware of the fact that raised exhaust ports do create more power, but I would have chosen the BT's over the E's, but for the fact that I didn't want to change my headers and exhaust.

With Chevy's you can have your cake and eat it too.