Quote:
Originally Posted by Mike Czech
1. Heat exchangers that make the underside of the case too hot. This can cause differential expansion of heads/cylinders and head studs and sometimes leads to pulling of head studs. This can be fixed with dilivar head steads which expand at the appropriate rates. (Do a search for "2.7 and dilivar" and you'll find a lot of info).
2. 5-blade fan. Some say it doesn't flow enough volume of air to cool the engine. This can be replaced with an 11-blade fan.
3. Cam chain tensioners are mechanical and can fail. If you replace with hydraulic tensioners, the problem is fixed.
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Please note: '74's do not have thermal reactor heat exchangers or the 5 bladed fan and are much less susceptible to heat issues. Dilivar studs present other issues.
Slush gives excellent advice. Many 2.7s have been rebuilt completely or had top end work to replace the valve guides. Find out what has been done to the engine by the POs, have a good PPI with leakdown and compression testing.
If the '74 you are looking has had a good external oil cooler under the passenger side front fender, chances are it may not have any heat related issues. I think this was one of the main causes of 2.7 heat issues - lack of an external oil cooler completely or just the trombone cooler which did little to help.
the 2.7 in my 74 was rebuilt over 25 years ago (due to value guide failure) and is still going strong.