[Motor Daddy]

I just got done pulling apart my 400. This is a 76 block. It's cracked in the exact same place as flamedabone's pic. It looks like the pieces would interchange. LOL

[HWYSTR455]

I'm shopping for a block as we speak. If anyone has a 68-71 400 2-bolt block, std bore they want to get rid of, let me know...

[PONTIAC DUDE]

I have used the 74/75 block and made over 900hp on spray without issues.
The 400 block with the 455 crank I ran at VMP running 9.30 flat on pump gas is a 74 block .090 over) so don't think that any certain year is that much better. As long as it's a pre 75 block, check the webbing, check for cracks and bore thickness, etc, most will hold up to what most people are doing.

If your gonna start putting billet caps and all the other stuff, making over 750hp and don't own a machine shop, LOL. Then I would start looking at the aftermarket block as far as dependability and longevtivity.

[455Dave]

Originally Posted by PONTIAC DUDE

I have used the 74/75 block and made over 900hp on spray without issues.
The 400 block with the 455 crank I ran at VMP running 9.30 flat on pump gas is a 74 block .090 over) so don't think that any certain year is that much better. As long as it's a pre 75 block, check the webbing, check for cracks and bore thickness, etc, most will hold up to what most people are doing.

Ken, are you talking about me again?

[70 lucerne lemans]

I guess Ill be giving Ken a call about a block,I dont trust mine after seeing the other 500557 blocks breaking.This projects been 3 steps forward 2 steps back the whole way.I would hate to tear up my Eagle rotating asy and Kre heads.It looks really fast sitting on the stand though.

[johnta1]

screamingchief, that first block with the lop-sided 0, must have been done on 2nd shift Friday!

Also, did the block have 4 bolt holes from the factory?

[screamingchief]

screamingchief, that first block with the lop-sided 0, must have been done on 2nd shift Friday!

Ha ha ha ha,,,yeah worse yet,looked it up,april 9 1973 was a monday,cast during the day shift!!!

So it's a post weekend "Oh man am I hungover" block,I dunno,ask me that's worse than a "I wanna get my check and go get drunk block",but that's JMO...

Yeah,sure fire grenade material,,,LOL.

Also, did the block have 4 bolt holes from the factory?

To the best of my knowledge,yes it was drilled and tapped from the factory,I got this motor when I needed to move back to Texas,traded my '73 ventura for it,was virtually zero miles beyond cam break-in and a couple blast up/down the block,guy had all the receipts,and heard it run,knew it was a pretty decent trade.

Was a lot easier than trying to move the car at that time,just stuffed this up in the front of the ryder rental,and headed south.

The 455 block is the same deal,drilled and tapped for 4 bolts,the other 400 block was'nt,I guess because it was a 2 bbl motor.

The YS 400 is also drilled and tapped for four bolts,but uses two bolt caps as well,I'll get those pics up here soon,that block has some weird casting irregularities in the crank area,almost look like cracks but they're too "patterned" to be cracks in my mind,I believe they are just a casting blemish or something of that nature.

[Jeff Walker]

Originally Posted by HWYSTR455

I'm shopping for a block as we speak. If anyone has a 68-71 400 2-bolt block, std bore they want to get rid of, let me know...

If you're willing to pay some shipping I have a '68 block that I could spare. Never been bored, never blown up.

[HWYSTR455]

Jeff, you have a PM...