[steve25]

Can't possibly be a 416 with that level of Torque !

[tekuhn]

That block has 3 freeze plugs and 2 engine mount holes. Doesn't that narrow it down to '67-'69? Can't be a 389, can it?

[ZeGermanHam]

Originally Posted by tekuhn

That block has 3 freeze plugs and 2 engine mount holes. Doesn't that narrow it down to '67-'69? Can't be a 389, can it?

I was also a little curious about that since 461s are typically achieved using a 400 block, not a 389.

[tekuhn]

They certainly could have built that using a 389 block, but it's pretty clear that they didn't. Not sure why go to all the trouble of calling it a 389 and stating the stock bore, horsepower, etc. I guess they wanted the mystique of using the iconic original Pontiac tri-power performance engine.

[steve25]

That block has 3 freeze plugs per side, big ribs in the lifter valley and a transfer lug at the bell housing so it any no way in hell a 389 or even a 400' it's a 428 or a 455 block, there tossing bull crap around!!!

[ZeGermanHam]

Originally Posted by steve25

That block has 3 freeze plugs per side, big ribs in the lifter valley and a transfer lug at the bell housing so it any no way in hell a 389 or even a 400' it's a 428 or a 455 block, there tossing bull crap around!!!

The 455s all had more engine mount bolt holes, though, yes?

[steve25]

True, so that's a 428 block since it only has 2 motor mount bolt pads.

[ZeGermanHam]

Originally Posted by steve25

True, so that's a 428 block since it only has 2 motor mount bolt pads.

You mention the ribs in the lifter valley of the 428s are bigger. The lifter valley doesn't look any different than my '68 400 block. Maybe I don't know where to look to see the difference?

[Stan Weiss]

They say it is bored to 4.155" yet the ring compressor has 4.140 written on it and then 4.13. Looks like same bore. Around 2.0 to 2.15 into video.

Stan

[slowbird]

Originally Posted by steve25

That block has 3 freeze plugs per side, big ribs in the lifter valley and a transfer lug at the bell housing so it any no way in hell a 389 or even a 400' it's a 428 or a 455 block, there tossing bull crap around!!!

Its a small journal block, most likely an early 400. All 428 had a large cast pyramid back by the dist (block in vid doesnt have one). Also molnar doesnt make 3.250 journal cranks that i know of. So it has to be a 3.00 main crank. And last, the block in vid was a 2 bolt block without factory outer main bolts drilled (otherwise they couldnt but splayed caps on), i might be wrong but i think all 428s were drilled for 4bolts from the factory, yes?

[tekuhn]

It's a '69 400 block. There is no transfer lug, the partial VIN begins with "29" and block code is visible, and the center lifter webbing does not have "28" cast in it. The block code is hard to distinguish and looks like it might be poorly stamped. I guess XH.

No transfer lug:


Block code and VIN:


Lifter Webbing has no "28":


Block Code Zoomed:

[tekuhn]

Originally Posted by slowbird

I might be wrong but i think all 428s were drilled for 4bolts from the factory, yes?

Yep.

[steve25]

Yup, I blew it on that detail!
All 428s indeed are tapped for 4 bolts, and only the 2bbl motor with the casting 46 heads was not fitted with the 4 bolt caps.

And to make laugh even more about my flub, I have owned all 3 types of the 428 blocks at one time or another,lol!

[tekuhn]

Was there a 2-bbl 428? I have a ‘69 YH 360hp 428 that has 2-bolt caps. It is the lowest HP 428 for ‘69. It is a 4-bbl motor, and the block is drilled and tapped for 4-bolt main caps. I thought all were 4-bbl?