Chevy 3970010 block

[ventura74]

I could not state with certainty the block had
nickol or bubble gum added. What I DO know
Is my machinist showed me with a rockwell tester
the block is damn

Damn hard??

[treyrags]

Anyone know anything about the Mexican blocks? I have two with casting numbers 3970010. I've been told by a few people they are good blocks and some machinists say they know there harder by the way they machine. Just wondering if there good for a street strip block. Thanks

i ran a Hencho en Mexico 010 Block , had thicker Cylinder Walls than the USA 010 Blocks
stock GM Chevy 3.480" Crank Rod Journals turned down 2.000" small journal Carrillo 6.000 HBeam Rods
M55HV oil Pump Ed Hamburger Oil Pan full length kickout alum
4.030x3.480
made 720 HP @ 9000 RPM
483 TQ at 6700 RPM

8000 Stall 7" inch A1-Converter
9200-9300 Shift
9800 to 10000 Finish Line RPM 5.14 gears 1.82 PowerGlide 12x33 10x15 Rims
60 FT =1.070
7.56 ET at 181.459 MPH
1420 Lbs w/Driver Rear eng Dragster

surely 500+ HP is very safe , even 600+ HP

Sounds like a B/ED back in the day