Terry:
I would add that the later head is of a superior design, as is
the intake manifold that
fits the later head. If the later head is milled to raise the
compression, the head and
manifold will deliver more power than the earlier one. This is despite
the fact that the
exhaust valve is smaller on the later motors.
If you rebuild the later motor, be sure to use the correct head
and intake gaskets, and
be sure to install the head gasket right side up. If you put it on
upside down, it will
blow within a few hundred miles.
My DPO used the earlier intake gasket, which occluded about 40%
of the intake ports,
and installed the head gasket upside down. The gasket was blown when I
bought the car.
Vance
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Terry Geiger
Sent: August 08, 2005 6:46 AM
To: michael lunsford; 6pack@autox.team.net
Subject: Re: Which engine to rebuild
The later block has two advantages:
1) recesses around the top of the cylinder bore improves head gasket
sealing
(less likely to blow a head gasket)
2) there is a reinforcement cast into the side of the later block, which
helps reduce "flex" of the engine block
Terry Geiger
Florence, Alabama USA
http://www.shoalsbritishcars.org
'74 Triumph TR6 (for sunny days)
'59 Triumph TR3A (basket case)
'84 Mercedes 300D (for the wife to drive)
'90 Chevy S10 (parts fetcher)
> Ok, I admit it, I've become wishy washy. I can't decide which of the
two
> engines I have to rebuild to replace the ailing one in 1970 TR 6.
Given
> that matching numbers aren't that important to me I am seeking the
> collective wisdom of the 6 pack net. I have an engine that I think
came
> from a 1970 TR 6 SN CC 65,XXX and a later engine that I think came
from a
> 73 or 74 TR 6 CF 13,XXX. Everything else being equal which of the two
> would be the better engine to rebuild and what are the difference?
TIA.
>
> Mike Lunsford, 1970 TR 6 (Throttle Body Injection)
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