because now that you mention it, Ron’s and the network54 member’s two blocks were all from the Cleveland foundry. Wonder what made those particular blocks harder?

Thanks for the inside scoop! Did the metallurgist happen to mention any details like this about the other Ford engine families?

royce do you that vermeersch personaly also?.i was a torn in his side in fun back in the old streetracing days,he could never believe how i got them bone yard 390's to match his 428'sbut when i needed parts he got them for me, him and i still friends,

i had friends that worked the dif ,engine plant,special casting,dso crib,hot metal cranes,and molds,they told me that there are some short cuts to meet demands,then they sneak me in on a sunday,pallets of 427 blocks 40 foot tall,,how long i can't remember,my friend who set up the machines to bore the cross bolts,and my other friend set up the bores,they had to be done by monday morning,before the next crew came in,and they were passed off as industrial blocks?

ok food for thought,i rember reading old hot rod periodicals that nhra let some 427's that were sleeved down to 428 bore ,run stock because of the wieght gain difference,in the cj class mustang,i think hubert platt was one of them,i also heard there was some diff in the pan rail width,427 was narrower?i was also told the 428 non reenforced block was approx 40 lbs lighter,the 428 cj,390 reenforced block was 20 lbs lighter,then i heard stories on a427"G" block?and then i heard stories about,the cooling tunnel at the casting plant to control some stuff in the curing,cooling process,the why does ford have that N on the heavier case rear housings,while then i seen the reenfored gear case whithout the N,then what does the N or nodlar realy mean,then i heard of gray iron blocks,frying pan grade iron block,that wore the bores out too fast,example,my 76 f 250 was wore out in less that 2 years,(14000)milesand it was called back for that prob,but i had dropped in a 66 mec 390 in by then,can any one explain?

I have had a lot of blocks and so has Royce and a 70 pound claim is ludicrous. It would be impossible to have an almost 50% increase in the weight of a bare casting no matter what style it is. The range in weights for FE blocks is less than 20 pounds based on the dozens if not hundreds I have shipped over the years. The later 427 is a little heavier but it has some extra material for side passges as well as the other features Royce mentioned. Walt, the G blocks are likely the C8 blocks that were made with extra phosphorus. The nodular iron rear case was made starting in 62 but during production in the fall of 68 Ford realized that they needed an identifier for the housings to preclude assembly error. Nodular iron is a type of iron where the graphite forms round nodules covered by an iron carbide shell. This type of iron is made through controlled use of magnesium to desulferize the iron and causes the graphite to form the nodules rather than flakes. Hawkrod