Originally Posted by ketterer87
i am in the process of putting a different motor in my truck..the old one had 200000+ miles on it....the other motor i have is a 350 crate motor but is carb and older will the blocks work if i use the heads and intake off my original motor....the crate motor is the 10066036 or something to that affect and its the mexican made 4 bolt with 2 piece rear main....ive done some research on it and it has the dipstick on the drivers side (which means its a 79 and older??) which is opposite of my motor so is this gonna be a problem?
TBI is unhappy with cams that are different, this is a risk with any crate motor not specifically sold as a TBI replacement. This can get you into a cam change to match the original engine or a chip change to the computer to get it to work with a different cam as long as the cam isn't too different. The limit is about 190-210 degrees of duration at .050 inch lift and not more than .43 inch lift at the valve. This can be done on a 300 dollar chip beyond this timing it gets really expensive before it becomes technically impossible to feed meaningful information to the computer from the sensors.
A two piece rear seal crank uses a different bolt circle than the one piece seal engine you have, this means you will have to obtain an older pre 1986 flexplate or flywheel to adapt the crankshaft to what ever the transmission is.
If the crate motor has a water pump, it will be the clockwise rotation pump for V-belts. Your engine uses the counterclockwise rotation pump for serpentine belt drive. The crate engine will either have to have all the accessory drives currently on the truck converted to Vbelt drive or the crate motor water pump replaced with the serpentine drive pump.
Lots of people get stung thinking they can save a few bucks by using these older design engines as a replacement for the newer computer managed single piece rear seal engines. GM doesn't make it clear that there are a lot of subtle, and not so subtle, changes beside the crank seal that makes crossing this line in either direction more complicated and expensive that it appears. The dip stick position is the least of your worries.