302 vs. 289 heads
Posting Guru
Joined: Mar 2002
Posts: 2,070
Likes: 2
From: Boise, Idaho
So I'm wondering what, if any, difference there is between the C6OE head and the C5AE head. I have a burette so I can 'cc' the head if anybody is curious.
My head does have a thermactor bump, so that might explain why there's a new casting number/part.
My head does have a thermactor bump, so that might explain why there's a new casting number/part.
Lead Driver
Joined: Sep 2003
Posts: 7,014
Likes: 207
From: SoCal
Aside from when the pushrod slots wearing out with age and you not being able to replace them, are there other disadvantages to them? Do the slots serve adequately as guides for the pushrods, even for high performance applications?
Laughing Gas
Joined: Feb 2010
Posts: 781
Likes: 8
From: Sanford, NC
All 289 HiPos used the slot guides for alignment of the pushrods and had screw in studs
but no guide plates and they worked fine with a solid lifter cam. All of the early 289
302 heads had the same size small valves and ports which really restricted the engines.
Any serious power requirement needed much head modification. Back in the day both
Holman-Moody and Shelby American offered fully ported 289 heads with larger valves.
Today all these heads would also need to have hardened valve seats installed to
survive the unleaded gas.
but no guide plates and they worked fine with a solid lifter cam. All of the early 289
302 heads had the same size small valves and ports which really restricted the engines.
Any serious power requirement needed much head modification. Back in the day both
Holman-Moody and Shelby American offered fully ported 289 heads with larger valves.
Today all these heads would also need to have hardened valve seats installed to
survive the unleaded gas.
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