[custom_rider]

Hi Guys !
I have my '77 Pontiac 350 Engine in machine shop.
They ask me what size should a standard rod big end be on a Pontiac 350 engine.

Thanks
Michael

 

[WDCreech]

Same as any other traditional Pontiac engine. Thay all have the 2.25" rod journal, unless they've been turned down to 2.20" to use BBC big end sized rods.

 

[[email protected]]

Not much of a machine shop.. The housing bores are listed in all bearing manufacturers spec books..

 

[cobalt327]

Scary that they'd be asking YOU... ain: :sweat:

 

[Mr. P-Body]

Ditto Bob and Cobalt... RUN AWAY!!!

BTW, the correct housing bore is 2.3745-2.3750".

It's a complete waste of money to 'rebuild" stock Pontiac rods. They're cast steel, not forged. They were inadequate when NEW, and now have a bazillion "cycles" on them. For about $250 (roughly the cost of rebuilding the stockers with ARP bolts), you can get 5140 forged I-beams with a 7/16" bolt. FAR superior to the cast rod, and better than ALL of the factory rods, possible exceptioin, the ultra-rare 421SD 4340 rods from '62 and '63. The 455SD 5140 rods are not as good as the "replacement" rods (IMO).

Jim

 

[custom_rider]

Thanks guys.
Can you give me size for main journals for 350 Pontiac ?

I know about rods,, that forged is better than cast
btw. i live in Poland, so guys in machine shop have only european sizes, so they ask me about US sizes

About rod journals ; what size is correct - WDCreech write 2.25" , Mr. P-Body write 2.3745-2.3750" - ??


thanks
Michael

 

[WDCreech]

Thanks guys.
Can you give me size for main journals for 350 Pontiac ?

About rod journals ; what size is correct - WDCreech write 2.25" , Mr. P-Body write 2.3745-2.3750" - ??


thanks
Michael

Crankshaft main journals for a 350 are 3.00", same as 326, 389, & 400. The 2.3745-2.3750, that Mr. P-Body gave, is the diameter of the rod big end before the bearings are installed.

Bill

 

[custom_rider]

Thanks Bill !
One more question ,
what is correct size for main caps journals (before the bearings are installed) ?

Michael