Back to normal
 

Hard to believe this combo lost power:

Inside of Frankenplenum:

http://i134.photobucket.com/albums/q...f/DSCN6374.jpg
http://i134.photobucket.com/albums/q...f/DSCN6375.jpg
Stock
http://i134.photobucket.com/albums/q...f/DSCN6378.jpg


Siamese Runner....
http://i134.photobucket.com/albums/q...f/DSCN6376.jpg
http://i134.photobucket.com/albums/q...DSCN6379_2.jpg

Re: Back to normal
 

Back to a ported plenum and IHs with sinuses

http://i134.photobucket.com/albums/q...f/DSCN6383.jpg

http://i134.photobucket.com/albums/q...f/DSCN6384.jpg

Re: Back to normal
 

Heads are still siamesed 1" down the runner
http://i134.photobucket.com/albums/q...f/DSCN6381.jpg

Re: Back to normal
 

My guess would be the transition into the runner if you have a large fillet or radius there it would help alot. Also how much tuning did you try with the modded plenum??

Dave Hetrick

Re: Back to normal
 

I don't think tuning could have gotten me anywhere but back to where I was before. The runners inlet radius was much smoother than stock

Re: Back to normal
 

I was referring to the transition just spit balling

:cheers:

Dave Hetrick