Which OD T-liner for 3.7'' bore conversion

Wotland · Post by **Wotland** » Sun Feb 11, 2007 4:53 pm

Good afternoon all.

Some members here have successfully bored out early 3.5 blocks with new liners to take 3.7'' pistons.

When I check the Westwood Website, they talk of an OD of 99.06mm for their T-liner 3.7'' bore in 3.9-4.6 engine. As I know this OD of T-liner are often used for 96mm piston conversion.

In Des Hammill book, I find 96.70mm OD for T-liner 3.7'' bore conversion.

Do you think there is an risk to use the Westwood liners in 3.7'' bore conversion in early 3.5 block ? Or I need to reduce the OD of T-liners ?

Thank for your advice.

Cheers.
Dimitri

sidecar · Post by **sidecar** » Sun Feb 11, 2007 5:16 pm

I could be wrong but I believe that people have dropped the 3.9 liners into a 3.5 block even though the 3.9 block does have more material around the liners without problems.

I can't see any problems using 3.7 liners.

Come to think of it why don't you use 3.9 liners?

Regards,

Pete

Post by **katanaman** » Sun Feb 11, 2007 9:18 pm

Mine is a 3.5 block with 3.9 liners in it and I believe Ian Stewart's is as well. Trouble is the top hat liners are probably bigger OD, I cant remember what the OD of the standard liners are.

HairbearTE · Post by **HairbearTE** » Mon Feb 12, 2007 1:09 am

Special thinwall liners are available specically fpr this conversion, they have a smaller OD than a standard 3.9 liner and hence a thinner sidewall. The obvious benefit being that more block material is retained, the downside is that the liner is too thin to overbore if this is ever required.

Wotland · Post by **Wotland** » Mon Feb 12, 2007 2:58 pm

Hi All,

Thank for your help.

If I convert the block I would like to use T-liner.

So if somebody has the OD diameter of genuine 3.9 Liner, it will be very helpfull for me.

Cheers.
Dimitri

HairbearTE · Post by **HairbearTE** » Mon Feb 12, 2007 7:27 pm

I've got one sitting on my sideboard at the mo! i'll measure it when i get in later this evening.

Boosted LS1 · Post by **Boosted LS1** » Mon Feb 12, 2007 9:25 pm

If you look at an AE catalogue you can find liners either unmachined or honed, finish fit.

Then you just order them.

Boosted.

HairbearTE · Post by **HairbearTE** » Mon Feb 12, 2007 10:36 pm

Here's your measurement. Its a cheapo digi caliper not a mic but it gives you an idea of the dimension you'll be dealing with. To be honest a good machine shop will mic the liners themselves before fitting anyway, just to be sure they spec up right.

Wotland · Post by **Wotland** » Wed Feb 14, 2007 9:51 am

Thank you very much HairbearTe for the measure.

Cheer.
Dimitri