motor swap

[roy c]

can i swap a 350 for a 454 in a 87 burb ? if so can i use the 350 tbi set-up?
just swap the long block pully's ect. also what is the cfm. on the 350 tbi?
Thanks roy c

 

[smurph20]

350 tbi will be to lea on the 454 itll be starving for gas

 

[bucket]

You can reuse all the TBI stuff, but you do need the 454 throttle body and injectors. The 454 TB uses a different plug for the IAC valve, so you will need to wire that in (4 wires) or buy an adapter harness. The 454 TB also doesn't have a spot on the linkage for a TV cable/kickdown cable if you have a 700R4 or a TH350, so you will have to add it if you need one.

 

[Jims86]

The 350 tbi is 450 cfm.
the swap can be done, but you will only be able to re use the computer, harness, and distributor. You will need to re-chip the computer for the 454 , you can get that on ebay for $25.
You will need 454 specific knock sensore and module, and of course, a 454 throttle body which has 2" bores and as opposed to the 1 11/16 bores.
Also, while shopping for the 454 throttle body, you need a unit from 87 to 93. the 94-95 units used smaller injectors, with a higher volume Multiport injection style fuel pump.

 

[bucket]

the 94-95 units used smaller injectors, with a higher volume Multiport injection style fuel pump.

What was the purpose in that?

 

[Jims86]

Have not figured that one out...i do know that they used the same injectors a 4.3 used, but with the higher pressure, they turned out to be about 70pph, as opposed to 45pph with 13psi.

 

[roy c]

Thank you Sirs for your help

 

[Jims86]

Thank you Sirs for your help

Happy Swapping!