Jump to content


308 engine rebuild questions- quite a few.

  • Please log in to reply
1 reply to this topic

#1 Screamin


    Forum Participant

  • Members
  • PipPip
  • 31 posts
  • Name:Richard
  • Location:Perth
  • Car:LX 4 door with 253
  • Joined: 07-January 19

Posted 14 April 2019 - 10:26 PM

Hi folks
I am reconining 76 red 308 for my LX.
It currently has a 253 so rather than throw money to get some more hp I figured 308 cheaper HP.

Couple of questions- the bore looks ok and is 20 thou over.
The pistons are unmarked brand wise and have valve recess in them. They are flat tops in good nick. They Measure 101.65 mm which is 4.001 inch from conversion table. They are flat top. Top ring gap is about 25 thou. Others say aim for 18 thou top 20 second?

The rods just say Holden. Top ring clearance to block top is .0100 though. 2.45mm.

I am pretty new to V8 builds but it sounds as though the block would benefit from being skimmed or decked? Does this mean I get new pistons and have machinist skim to 0 clearance.

The heads are pre early reds with l34 spec valves.
I plan to put a crane 276 cam in it and fit a edelbrock performer intake. It can with 1/2 inch riser and newish 600 cfm eldelbrock carb. It has roller rockers. Some say replace standards with 5/16 walled versions. Do I need to? Will standard hydro lifters suffice?

Main thing is I want a really nice streetable motor with the best hp I can get cheaper the better. Still got to spend 5 k on total trim kit.

Hope some of you can answer some of these questions so I can get onto it. I have the skills to work on myself.

Any advice would be great. U folk have provided some great advice info so far. New to Toranas too.


I meant top piston clearance to block top is 0.0100 thou not from ring.

#2 LS1LX


    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 1,930 posts
  • Location:Sydney
  • Joined: 22-November 05

Posted 15 April 2019 - 07:21 AM

A stock 308 rebuild is around $5k these days and that’s nothing fancy.
You will get new pistons, heads serviced etc.
Don’t expect a rocket ship from an old 308 unless you pump some $$$ into it

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users