Discussion of the 426 Street / Strip HEMIs.
Moderators: TrWaters, 392heminut, scottm
- Posts: 4
- Joined: Wed Sep 05, 2007 5:29 pm
i have no clue what it is i thought it is a 4 valve if 2v why not 4?
Nitrous is like a hot chick w/ an STD. You'd hit it but you are afraid of the consequences
- Posts: 488
- Joined: Sat Nov 30, 2002 2:16 pm
All hemi heads are 2 valve, the hemisperical combustion chamber shape can't be run with 4 valves, the valves would hit each other when they open due to their angle. The 2 intakes would hit each other and the 2 exhaust valves would hit each other. 4 valve heads have each pair of valves parallel to each other so they don't hit when opening. Their chambers are called 'pent roof chambers'.
Owner of the Poor Man's Hemi Cuda
- Posts: 4
- Joined: Mon Jan 29, 2007 4:38 pm
- Location: Frozen Wastelands
392heminut wrote: 4 valve heads have each pair of valves parallel to each other so they don't hit when opening.
There's always an exception: Honda Radial Four-Valve chamber as used on the old XR600R (and others) dirt bikes.