Big Chief minimum cylinder bore

bbc · 11-03-2009, 09:56 PM

What is the minimum cylinder bore allowable for use with a big chief?? The specs all state 4.5"-4.6". Can they be used with a 4.375" bore?

Thanks

kevin@dart · 11-04-2009, 02:33 PM

We have a special 18 degree 381 program head that will work on a min. 4.375 bore

Awesome Bill · 11-15-2009, 03:27 PM

If you do that, you will not see but maybe 40hp more @ best till around 8000rpm. Stroke, intake, cam etc will all play a big part as well as rpm.

11-03-2009, 09:56 PM	#1
bbc Status: New Guy Join Date: Nov 2009 Posts: 1	Big Chief minimum cylinder bore What is the minimum cylinder bore allowable for use with a big chief?? The specs all state 4.5"-4.6". Can they be used with a 4.375" bore? Thanks

11-15-2009, 03:27 PM	#3
Awesome Bill Status: Venerable Member Join Date: Oct 2007 Location: Ocean City, MD Posts: 1,860	If you do that, you will not see but maybe 40hp more @ best till around 8000rpm. Stroke, intake, cam etc will all play a big part as well as rpm. __________________ - Bill Cannon - - Custom Drag Racing Engines & Transmissions - Awesome Engines -

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11-04-2009, 02:33 PM	#2
kevin@dart Status: Moderator Join Date: Oct 2009 Location: dart heads Posts: 59	We have a special 18 degree 381 program head that will work on a min. 4.375 bore