How much boost pressure can a Cosworth 4x4 engine take with original internals? Without lowering CR, standard cams, grp A head gasket, standard headbolts etc.

Don't want to use the fuelling to much to lower the EGT.

 

on what turbo mate??

probs take 18-20 psi on the standard t3 no worries

 

Have a Garrett T3/T04E with ball bearing, .63 ex house.

 

Well ive run 26psi for over a year now with a T34 and have no probs