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Author Topic:   289 Heads

Posts: 111
From: Worhtington, Pa. USA
Registered: Feb 2000

posted 12-24-2001 10:26 AM     Click Here to See the Profile for 66fstbck     Edit/Delete Message   Reply w/Quote
As you probably know by now, I'm just starting to build my 289...... well, I will be, once my block gets back from the machine shop. Anyhow, I am looking at a couple sets of heads that are for sale and would like some input as to which would be better for my application. 1. Set of 69 351W heads with 5K on them. 2. Set of GT40P bare castings. I'm looking for abt. 250 - 300 HP out of the engine and am on a bit of a restricted budget (2 kids in college).
TIA and Merry Christmas to all !!!!

Alan 66 Fastback

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V8 Thumper

Posts: 2950
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 12-24-2001 11:06 AM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
GT40 heads may have more potential... but bare heads can get pricey to complete, especially if they still need machine work. '69 351W are good pieces, quite popular for their larger valves (compared to 289 heads), however larger combustion chambers will bring your compression ratio down. Gasoline today is no gift, so that could be a good thing. Complete heads w/ 5k miles (if that's a reliable, honest claim from the seller) sounds like the budget beater way to get a good set of heads, depending on the price and condition, of course. How much does the seller want for the 351 heads? Do they have hardend exhaust seats? How about screw-in studs? Been ported(careful with that one)? What valve springs are on it? Stainless valves or stockers? All variables to concider. I seem to recall a specific head gasket necessary to run those heads on an earlier block, as well as drilling some waterway/steam holes in the deck (a minor procedure) to accommodate this head/block combo, but don't quote me on that. I also beileve 351W heads are drilled for 1/2" head bolts, you'll either to buy a bushing kit (cheap) or have your block drilled and tapped (expensive). Finally, inquire about magnafluxing before you purchase any iron heads

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