Alum Head

Posted on | July 30, 2010 | 4 Comments

Alum Head

How high will a Ford 289 rev safely for racing?

I have been told the Ford 289 will rev higher then other small block Ford V8's. Mine is a rebuilt 1967 289 with a hydrolic race cam, 30 over 11 to 1 pistons, Moly rings, alum. rods and a cast crank. Heads are stock castings , ported with a three angle valve job, duel springs, heavy duty retainers, roller rockers & stud girdles, moly push rods and guide plates.

The weak link in your chain is the main caps. The 289 is a 2 bolt main block. I had my 347 stroker up to 6000RPM a few times over about 600 miles and when I pulled off the main caps, you could see where they were "dancing" up and down on the block and the two surfaces were compromised. This was with ARP main studs (yes torqued properly).

The solution for your bottom end (if you stick with this block) is a main girdle...one like this http://store.summitracing.com/partdetail.asp?part=TFS%2D51500700&autoview=sku
The girdle will actually "twist" the block a little so it needs to be line honed by a machine shop.

Another limiting factor (only considering rev's) in your case is the hydraulic lifters. If your only concern was more revs then look into solid lifters and a different cam. Do you have hardened push rods?

If you post the specs on your cam I could give you an idea of how high it will safely rev. Duration, lift, lobe separation, etc.

RIT Alum boat @ 2007 head of the Charles

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