Gen VI 489 +20 build
#21
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Thats a cool engine GM came out with, for towing applications. 4.25 forged crank, vortec heads, etc. Pretty much a big brother to the old 454 L29 Vortec engines, like I have in my 1997 dually, and a bigger version of the old "tall deck" 427T engines.
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#22
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#23
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#24
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#27
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Mine was kind of a long story... A builder owed a friend some money and gave him this motor for part of it. It was supposed to be a 540hp 502ci. I pulled the cam to put in one with a fuel pump lobe and discovered it was a truck cam. I pulled the head and it had small valves with Mk IV head gaskets. My buddy is going after the builder and charging him for my cam and heads. I paid $2,500 for it. He gave me a Lunati cam and lifter set along with the heads. The cam kit was $1,100 alone. I figured I still am doing well at $2,500 and some labor.
#28
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It interested me so I did some googling... seems to be built for cng/lpg and 4500 rpm max rpm (most likely because of cam im guessing) also from the piks of it online (the sale version not the op's) it looks like it has peanut port heads?? 19256827 though its hard to tell looking at a tiny screen
Though there might be a few different versions of the motor.
I really find it strange though as I thought gm had backed away from the bbc
Though there might be a few different versions of the motor.
I really find it strange though as I thought gm had backed away from the bbc
#29
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It interested me so I did some googling... seems to be built for cng/lpg and 4500 rpm max rpm (most likely because of cam im guessing) also from the piks of it online (the sale version not the op's) it looks like it has peanut port heads?? 19256827 though its hard to tell looking at a tiny screen
Though there might be a few different versions of the motor.
I really find it strange though as I thought gm had backed away from the bbc
Though there might be a few different versions of the motor.
I really find it strange though as I thought gm had backed away from the bbc
The light truck market may have got away from the gas big blocks, but in the school busses, rvs, and things like that, it seems like they may be wanting to get away from diesel in some circumstances. The small LS engines they use in light duty pickups now, just wont make the low rpm power the big block engines can.
#30
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It interested me so I did some googling... seems to be built for cng/lpg and 4500 rpm max rpm (most likely because of cam im guessing) also from the piks of it online (the sale version not the op's) it looks like it has peanut port heads?? 19256827 though its hard to tell looking at a tiny screen
Though there might be a few different versions of the motor.
I really find it strange though as I thought gm had backed away from the bbc
Though there might be a few different versions of the motor.
I really find it strange though as I thought gm had backed away from the bbc
Here's the new heads: