Bore notching 454's

Reply Subscribe

Thread Tools

10-19-2018 | 07:13 PM

#21

MILD THUNDER

Thread Starter

Registered

Joined: Jul 2004

Posts: 11,332

Likes: 73

From: chicago

Brian tooley(trick flow heads) has a great video regarding valve diameters, valve lifts, and coefficient of discharge . Ill look for it later. Good topic though

10-21-2018 | 12:54 PM

#22

getrdunn

Registered

Joined: Feb 2009

Posts: 8,356

Likes: 1,515

From: NW Michigan

Quote:

Originally Posted by MILD THUNDER

Brian tooley(trick flow heads) has a great video regarding valve diameters, valve lifts, and coefficient of discharge . Ill look for it later. Good topic though

definately a good topic. I know Jim has played around with a lot of that over the years. On small and large CI builds. Look forward to seeing the link.

10-21-2018 | 07:40 PM

#23

Tinkerer

Registered

Joined: Jan 2002

Posts: 4,612

Likes: 7

From: ALTO, MI

ICE - that narrow space is there even without bore notching. The head if the valves are un shrouded will be that narrow - bore notching just narrows the cylinder for a small area.
The higher lift cam the more the airflow is blocked.