is it possible to swap a 4.3 vortec engine and transmission out of a 1998 silverado with a350 engine and transmission from a 1974 C 10

Asked by Feb 10, 2015 at 10:18 AM

Question type: General

2 Answers

8,755

It can be done, but you won't pass any emissions check, so depending where you live it may not be legal to drive on the street anymore.

10,395

Rich is right. It would be a pretty large project to adapt that engine, but it can be done. But going with an engine from 1974 to a 1998 vehicle, you will have to delete all of the emissions as the 74 engine will not be compatible. Take the ECU and chuck it because everything will be different as the ECU is programmed to control the 4.3 engine, check it's emissions, timing, air/fuel ratio, etc.. A carburetor from 1974 cannot be electronically controlled. You would basically convert your 1998 to a 1974 emissions and control standard. It is without doubt that the vehicle will not get through an inspection for emissions on a 1998.

Your Answer

Add photo

Related Questions

Shortcuts

Search General Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

General Experts

#1 Tom Demyan
Tom Demyan
Reputation 42,730
#2 COMETGUY61
COMETGUY61
Reputation 36,110
#3 FordNut
FordNut
Reputation 29,610
View All