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Forum: Pontiac - Street 09-20-2021, 06:13 AM
Replies: 25
Views: 3,163
Posted By steve25
The stampings above the YF code tell you it was...

The stampings above the YF code tell you it was not a service replacement block.

The number stamping on the Rods tell you it was rebuilt.

The motor has 60 psi thick bottom plate oil pump which...
Forum: Pontiac - Street 09-17-2021, 06:18 PM
Replies: 25
Views: 3,163
Posted By steve25
Yes, the heads! The block has no type of 4X...

Yes, the heads!
The block has no type of 4X designation on it.
Forum: Pontiac - Street 09-13-2021, 06:54 PM
Replies: 25
Views: 3,163
Posted By steve25
700 bucks is a lot for what might only be a...

700 bucks is a lot for what might only be a usable short block due to the fact that so many of those 4X are cracked!
You could use that 700 towards rebuild that 389 into a nice stock bore 400 !
Forum: Pontiac - Street 09-13-2021, 05:31 PM
Replies: 25
Views: 3,163
Posted By steve25
Actually talking about the Ball hone look, closer...

Actually talking about the Ball hone look, closer inspection looks like it was ball honed with the 120 grit one, and not the needed 320 grit if Moly face rings where used!
Forum: Pontiac - Street 09-13-2021, 04:35 PM
Replies: 25
Views: 3,163
Posted By steve25
Just keep in mind that if they are stock cast...

Just keep in mind that if they are stock cast pistons that they where prone to cracking out the ring lands even with just part throttle pinging if you had too much timing dialed in !
Forum: Pontiac - Street 09-13-2021, 03:20 PM
Replies: 25
Views: 3,163
Posted By steve25
The pistons look like stock cast to me and the...

The pistons look like stock cast to me and the bore finish looks ok if there’s no ridge at the top?
Hopefully they check out with little to no taper!
Showing results 1 to 6 of 6

 
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