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There's no real "spec" on that, much depends on the existing housing bore =
dimension on the other 2 mains, & how much was taken off initially.If it di=
dn't have much taken off in the initial line-boring, & center & rear housin=
g bores are in limit, it shouldn't change the crank center too much to size=
the front cap & clean it up... but... if excessive it will affect all poin=
ts noted, & rear seal concentricity...Heck I've seen engines that were bore=
d so much that the bearing tang groove was too small!
Glen Efinger
On Tuesday, July 28, 2026 at 06:35:12 AM EDT, tr4racing@googlemail.com =
<tr4racing@googlemail.com> wrote: =20
Hi Chuck,
the crank is moving upwards from bore action to bore action. Means the pist=
on deck is getting closer to the head each time and also the chain gets loo=
sen more and more because the crank is moving towards the camshaft.
A matter of measurement how far you can go.
Cheers
Chris
-----Original Message-----
From: Fot <fot-bounces@autox.team.net> On Behalf Of Chuck Gee
Sent: Tuesday, July 28, 2026 12:20 AM
To: Philip Gott <vfracing@aol.com>
Cc: Friends Of Triumph <fot@autox.team.net>
Subject: Re: [Fot] How many times can you line bore a block?
I could be wrong, but I don=E2=80=99t think line boring affects that dimens=
ion.=C2=A0 I understand it to be making the caps a little shorter then rebo=
ring to match the upper diameter in the block.=C2=A0=20
Otherwise, a bunch of other dimensions would be goofed up too.
Chuck Gee
> On Jul 27, 2026, at 4:56=E2=80=AFPM, Philip Gott <vfracing@aol.com> wrote=
:
>=20
> =EF=BB=BFOr another way to ask the question is =E2=80=9Chow much misalign=
ment between the crankshaft and transmission input shaft can be tolerated?=
=E2=80=9D
> I had a block completely gone through, including line boring and it ran v=
ery well until number one cylinder liner suddenly split. The engine hydro l=
ocked and broke the crank and front main bearing cap. I have a new cap; to =
use it requires the block be line bored again. I=E2=80=99m wondering if any=
one else has a similar experience and can tell me either that it worked out=
well, or that I should throw the block away.
> Thanks as always!
> Phi
>=20
>=20
>=20
> Sent from my iPhone
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/chasgee22@g=
mail.com
>=20
>=20
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glemail.com
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m
=20
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<html><head></head><body><div class=3D"ydp6a727b8dyahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">There's no real "spec" on th=
at, much depends on the existing housing bore dimension on the other 2 main=
s, & how much was taken off initially.</div><div dir=3D"ltr" data-setdi=
r=3D"false">If it didn't have much taken off in the initial line-boring, &a=
mp; center & rear housing bores are in limit, it shouldn't change the c=
rank center too much to size the front cap & clean it up... but... if e=
xcessive it will affect all points noted, & rear seal concentricity...<=
/div><div dir=3D"ltr" data-setdir=3D"false">Heck I've seen engines that wer=
e bored so much that the bearing tang groove was too small!</div><div dir=
=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"fa=
lse">Glen Efinger</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><di=
v><br></div>
=20
</div><div id=3D"ydp23d1adb9yahoo_quoted_6029711007" class=3D"ydp23=
d1adb9yahoo_quoted"><div class=3D"ydp23d1adb9yahoo-style-wrap" style=3D"fon=
t-family:Arial, Helvetica, sans-serif;font-size:16px;">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div class=3D"ydp23d1adb9quoted-text-header">
On Tuesday, July 28, 2026 at 06:35:12 AM EDT, tr4ra=
cing@googlemail.com <tr4racing@googlemail.com> wrote:
</div>
</div><div style=3D"font-family:'Helvetica Neue', Helvetica=
, Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #cc=
c;padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"ydp23d1adb9inline_rep=
ly_quote_container" data-split-quote-node=3D"true">
<div><br></div><div><br></div>
<div><div dir=3D"ltr">Hi Chuck,<br></div><div dir=3D"ltr"><=
br></div><div dir=3D"ltr">the crank is moving upwards from bore action to b=
ore action. Means the piston deck is getting closer to the head each time a=
nd also the chain gets loosen more and more because the crank is moving tow=
ards the camshaft.<br></div><div dir=3D"ltr">A matter of measurement how fa=
r you can go.<br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Cheers<b=
r></div><div dir=3D"ltr">Chris<br></div><div dir=3D"ltr"><br></div><div dir=
=3D"ltr">-----Original Message-----<br></div><div dir=3D"ltr">From: Fot <=
;<a href=3D"mailto:fot-bounces@autox.team.net"; rel=3D"nofollow" target=3D"_=
blank">fot-bounces@autox.team.net</a>> On Behalf Of Chuck Gee<br></div><=
div dir=3D"ltr">Sent: Tuesday, July 28, 2026 12:20 AM<br></div><div dir=3D"=
ltr">To: Philip Gott <<a href=3D"mailto:vfracing@aol.com"; rel=3D"nofollo=
w" target=3D"_blank">vfracing@aol.com</a>><br></div><div dir=3D"ltr">Cc:=
Friends Of Triumph <<a href=3D"mailto:fot@autox.team.net"; rel=3D"nofoll=
ow" target=3D"_blank">fot@autox.team.net</a>><br></div><div dir=3D"ltr">=
Subject: Re: [Fot] How many times can you line bore a block?<br></div><div =
dir=3D"ltr"><br></div><div dir=3D"ltr">I could be wrong, but I don=E2=80=99=
t think line boring affects that dimension. I understand it to be mak=
ing the caps a little shorter then reboring to match the upper diameter in =
the block. <br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Othe=
rwise, a bunch of other dimensions would be goofed up too.<br></div><div di=
r=3D"ltr"><br></div><div dir=3D"ltr">Chuck Gee<br></div><div dir=3D"ltr"><b=
r></div><div dir=3D"ltr">> On Jul 27, 2026, at 4:56=E2=80=AFPM, Philip G=
ott <<a href=3D"mailto:vfracing@aol.com"; rel=3D"nofollow" target=3D"_bla=
nk">vfracing@aol.com</a>> wrote:<br></div><div dir=3D"ltr">> <br></di=
v><div dir=3D"ltr">> =EF=BB=BFOr another way to ask the question is =E2=
=80=9Chow much misalignment between the crankshaft and transmission input s=
haft can be tolerated?=E2=80=9D<br></div><div dir=3D"ltr">> I had a bloc=
k completely gone through, including line boring and it ran very well until=
number one cylinder liner suddenly split. The engine hydro locked and brok=
e the crank and front main bearing cap. I have a new cap; to use it require=
s the block be line bored again. I=E2=80=99m wondering if anyone else has a=
similar experience and can tell me either that it worked out well, or that=
I should throw the block away.<br></div><div dir=3D"ltr">> Thanks as al=
ways!<br></div><div dir=3D"ltr">> Phi<br></div><div dir=3D"ltr">> <br=
></div><div dir=3D"ltr">> <br></div><div dir=3D"ltr">> <br></div><div=
dir=3D"ltr">> Sent from my iPhone<br></div><div dir=3D"ltr">> ______=
_________________________________________<br></div><div dir=3D"ltr">> <a=
href=3D"mailto:fot@autox.team.net"; rel=3D"nofollow" target=3D"_blank">fot@=
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ank">http://www.fot-racing.com</a><br></div><div dir=3D"ltr">> <br></div=
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