Dear Oldsmobile,

[TURNA]

Just took apart the 403......Starting over...........................

 

[fleming442]

sh*t machine work, I assume. If they're Speed Pro/TRW pistons, they're probably too tight, anyway.

 

[TURNA]

20 on the crank 20 on the rods
40 on the pistons

this thing was beat to poop

 

[fleming442]

That's what it needs, or where it is?

 

[olds307 and 403]

Should be fine if the clearances are good. How far are pistons in hole?

 

[TURNA]

Thats where its at now everything is good but that crank was never that strong to start out with

 

[TURNA]

I'll be milling the 4A heads maybe around 50 thousandth along with the intake to bump up the compression

83cc on the heads as advertised

Previous builder just did a clean up mill

 

[olds307 and 403]

True it is weaker, just keep the revs reasonable and it will live a long life. The later cranks are weaker but weigh less too. I've had my 76 wimpy crank to 5000 rpm with 0 issue. It took 5500 rpm with an unbalanced 307 crank in my 403 to spin rod bearings.

 

[TURNA]

The 403 and 307 use the same crank?????

 

[olds307 and 403]

I'll be milling the 4A heads maybe around 50 thousandth along with the intake to bump up the compression

83cc on the heads as advertised

Previous builder just did a clean up mill

Any port work on the exhaust side? It is severely in need of work. The intake side just needs a bowl hog and blend to flow nicely.