I pulled my engine out of my 86 silverado 3/4 ton as i put my big block in it i needed more torque to pull my trailer.............well i lucked upon a 89 suburban 4x4 with a blown up 350............my engine out of my truck which i thought was a 350 was pretty ballsy so ive started to put it in the burban...........after looking up the codes on the block and heads to my suprise its a 75 400 small block, but the heads are the dreaded 87 or 88 small block tbi heads, which i hear are what gave tbi a gutless wonder...The motor had a nice alluminum intake with a 600 holley and had plenty of power.....i want to use the tbi on the burban, so i figured i have to use the intake out blown up 350 that was in the burban, to make everything work......my question is what should i do about the heads.........they seemed to just fine.

is the 400 sb gonna be ok being fed by the tbi in the burban?

Are the 350 heads gonna be ok? Are the heads holding back what the 400 can do?

Im getting ready in a few hours to put the tb intake on the 400 and drop it in, i know im gonna have to change distrobuter, can you see any other problems im gonna have........................

Any ideas on the heads, or what heads i should get as i dont have a bunch of money to spend on some high horse heads, but do have a good friend at the salvage yard and get whatever i want off the cash for clunker trucks as he has a buunuch of them her had to pour fiberglass down in the intake.

 

find yourself a pair of l33 votec heads from a 96-99 350, dont forget to drill the steam holes in the heads. but you would need a diffrent intake if you go this route to match the heads

 

Get these heads or stay at home.

 

These heads r fine and the tbi will be fine as well this suburban is no race car lol the 350 heads slightly bump the 400 compresion all thogh there obviously not the best choice there what you have and buying a better set of heads will be pointless once you up the performance past where you r the tbi will never keep up so head swap equals injection swap which meens more cash