youngmonte71 Posted January 28, 2011 Posted January 28, 2011 im looking to put a 454 in my monte and i found one but i want to know if its a good block to use for 500hp. the # is 10069286. i think it is the Mark IV 4-bolt main. i want to know if this is a good engine. The guy that has it does not know what it is all he knows is its a stock crate motor but can not remember which. Quote
Mike 57 Posted January 28, 2011 Posted January 28, 2011 Should be a 4 bolt main 90 to 91 Mark 4 block. What heads are on it? Quote
CrazyDavey Posted January 28, 2011 Posted January 28, 2011 Tyler, I think that was the last of the Gen IV blocks, maybe around 1990. I would just spend the money for a sonic test to make sure it has no excessive core shift that might result in a thin cylinder wall. Other than that it will work just fine, 4 bolt is a good thing and will handle tons of horsepower..Dave Quote
youngmonte71 Posted January 28, 2011 Author Posted January 28, 2011 My next ? is what are the stock heads on it? and what are the piston size like cc wise? if anyone knows that. because if i get it im going to put 110cc heads on it and i want the comprestion to be 10:1 Quote
youngmonte71 Posted January 28, 2011 Author Posted January 28, 2011 i was wonderin about the 10069286 Mark IV 454 stock specs. like the rod length, the stroke, the bore, and the piston cc if anyone knows. Quote
Mike 57 Posted January 28, 2011 Posted January 28, 2011 The casting number does not give any information as to cast or forged crank or piston type or the type of heads. The bore and stroke on a stock 454 is 4.25" bore and 4" stroke, the rod length is 6.135. The pistons are most likely flat top cast if it is out of a pick up or something like that. Quote
bigtankjones Posted January 28, 2011 Posted January 28, 2011 Where did you get the I.D number from on the block, because all of the casting numbers I have dont match anything like that. If it is a Gen VI, the casting number should be a 3999289 for a 1972-78 2 bolt main. A 454 4 bolt main, something like 10051107. These numbers came from the chevellebigblock.com/pdf/bigblock. site. Quote
Andy's Auto Posted January 28, 2011 Posted January 28, 2011 Not a bad block at all. Would make a great base for a 496 stroker. Quote
72 LS5 Posted January 28, 2011 Posted January 28, 2011 If it was a complete, intact 4-bolt main 454, then it should have a forged steel crank, big 7/16 rods, and forged pistons (which you probably can't use if you bore it). Great bullet-proof start! Â A lot of big blocks down here in FL were used in salt water boats, so find out if it was a boat motor. If it was, there could be tons of scale and rust in the water jackets. Quote
bigtankjones Posted January 28, 2011 Posted January 28, 2011 A Gen v BBC where made from '91-'94. I have one in my Monte out of a '94 Dually. And I love it. I would like to throw a new set of heads and a cam in someday. Quote
Mike 57 Posted January 29, 2011 Posted January 29, 2011 According to the casting number it is a MARK 4 not a Gen 5 Quote
wallaby Posted January 29, 2011 Posted January 29, 2011 Even a LS-5 with 2-bolt mains and cast crank is supposed to be good for 500hp. You're good to go either way. Quote
Mike 57 Posted January 29, 2011 Posted January 29, 2011 Yes it would be a great platform for a 500+ build. I just wanted him to be sure of what he is getting. Quote
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