Rebuilding a TB42

[madgq]

Hey guys, new to this forum just learning how it works..

I'm gonna build up a TB42 engine from a bare block and head..
What should I do to it?

What cam shaft?
What pistons/rods?
Anything to the head?
Anything else?

Will most likely be turboing it so any help would be appriciated, gonna be running a T70 top mount top mount with 12 psi at this stage and running an auto box.. and looking for a lower torque range.

TIA guys

Wes

[scottmeister]

How much do you have to spend?

I'd talk to Crow Cams about a cam to suit your needs - petrol or LPG, what RPM range do you want etc. P/N 442867 looks good to me though. I'd run a fresh set of Crow Cams valve springs to suit too.http://www.crowcams.com.au/media/catalogues/41.0%20NISSAN%20PATROL.pdf

If you're going to turbo it with only mild boost say up to 15 psi stick with 8.5:1 pistons. More boost, go 8.0:1. No boost, go 9.0:1. LPG and boost, go 9.0:1. Spool conrods and PPM pistons isn't a bad deal at around 2K. Get the head crack tested, fit new exhaust studs, get combustion chambers cleaned/sharp dags removed especially around spark plug threads and chamber edge. Install high-nickel valve seats and good valves (go 1 mm larger if head will allow). Only skim head face at minimum required, Cometic MLS head gasket, ARP head studs if you can afford it.

PS Get a Garrett GT turbo!

[madgq]

I want a low torque range, lets say 1000 - 3500.. straight petrol cost is a if/but type thing ill pay what I need to I can be a slow build if need be

Cheers for your help

Ps GT3540 may be a goer

[billyj]

have a chat to joel at 4bfab in carrum downs pretty sure he had a couple of custom cam grinds that worked well in a tb42 and has tuned numerous turbo tb42 engines including mine

[madgq]

What size would I go in mls head gasket?

Available thickness:*.027", .030", .036", .040", .045", .051", .060", .066", .070", .075",*
.080”, .086”, .092”, .098”, .120"

[billyj]

that depends on how much compression your aiming for and how much material gets removed from you block/head during the machining processes