Lotus Elan and Lotus Elan Plus 2 Forums

I am currently preparing a cross-flow block for a twin cam engine. I
have decked it to suit standard Lotus pistons but remember reading
somewhere that the engine mount bosses on one side project 1/2"
further out than the 'L' blocks. Can anyone confirm which side
(inlet or exhaust) and whether the bolt holes then need to drilled
and tapped deeper?

Thanks
Mike
'72 Sprint

Mike
On my 711 block i needed 1/2 inch spacers on the exhaust side,turned down from a piece of ali bar

John


velo5338 <***@***.***> wrote:


I am currently preparing a cross-flow block for a twin cam engine. I
have decked it to suit standard Lotus pistons but remember reading
somewhere that the engine mount bosses on one side project 1/2"
further out than the 'L' blocks. Can anyone confirm which side
(inlet or exhaust) and whether the bolt holes then need to drilled
and tapped deeper?

Thanks
Mike
'72 Sprint

Mike,

I built a 711 engine. The casting is different as you say, but you don't have to modify it. In any case, drilling and tapping the block would not do anything for you. All you need to change are the bolts and spacer sleeves for the exaust side.

Sean Murray
----- Original Message -----
From: velo5338
To: ***@***.***
Sent: Saturday, March 05, 2005 3:16 PM
Subject: [LotusElan.net] 711M Block Mods.



I am currently preparing a cross-flow block for a twin cam engine. I
have decked it to suit standard Lotus pistons but remember reading
somewhere that the engine mount bosses on one side project 1/2"
further out than the 'L' blocks. Can anyone confirm which side
(inlet or exhaust) and whether the bolt holes then need to drilled
and tapped deeper?

Thanks
Mike
'72 Sprint