289 top end onto a 5.0 block

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Aug 21, 2007 | 02:58 PM

#11

SS4LUNCH

1st Gear Member

Joined: Aug 2007

Posts: 119

From: NV

RE: 289 top end onto a 5.0 block

Both heads suck really. Not enough difference for me to swap to another.

Aug 21, 2007 | 03:02 PM

#12

Soaring

I ♥ Acer

Joined: Oct 2004

Posts: 17,565

From:

RE: 289 top end onto a 5.0 block

Tell us what you really think.

But, yeah, you are right. There is no doubt that the aftermarket aluminum heads are far superior to these old heads, but these old heads are what came on a 289 or 302 V8 Mustang back in the 60's. You dance with the one who brung you.

Aug 21, 2007 | 06:59 PM

#13

countryboy116

2nd Gear Member

Joined: Jun 2007

Posts: 205

RE: 289 top end onto a 5.0 block

Isn't it true that the newer 302 block would be more reliable because of some kind of hardened seals(?) (not sure exactly what it is just heard about it) or something like that to work with unleaded gas as opposed to the older 289 block that was made to run on the leaded gas?I think that is why he is asking.

Aug 21, 2007 | 09:00 PM

#14

highhilleer

2nd Gear Member

Joined: Mar 2006

Posts: 490

From:

RE: 289 top end onto a 5.0 block

Quote:

ORIGINAL: countryboy116

Isn't it true that the newer 302 block would be more reliable because of some kind of hardened seals(?) (not sure exactly what it is just heard about it) or something like that to work with unleaded gas as opposed to the older 289 block that was made to run on the leaded gas?I think that is why he is asking.

The hardened seats are in the heads, not the block.
Adding hardened seats to the exhaust seats is a standard procedure when rebuilding old heads. There is even some question if hardened seats are needed for a street engine.