305 to 350 swap question

[profox02]

i got a '91 with a 305, i gonna put in a chevy 350 crate engine,
the guy who is selling it, says its a '99. what do i need to do to swap these to engines, ive been told i need to change the injectors, PROM, knock sensor, and egr, but ive also been told that i just need to change my injectors, and knock sensor, and it sould run fine....is this true?

[Xrrider280]

I have a '93 and I swapped my 305 to a used '89 350 from a Van. I changed the fuel injectors and left the knock sensor that was on the 350 engine. My truck seems to run fine now.

[profox02]

Thanks For The Info

[Xrrider280]

no problem, i am going to buy a computer chip for the 350 now though because it lacks all of its potential power. It still has more than the 305 though

[rpreston]

I changed the Prom, injectors and knock sensor in my '90. Those were the only things different between the 305 and 350. The replacement engine I got was a rebuilt '90. I don't know if there are other differences to consider for a '99 crate engine. Does the '99 your looking at have Vortex heads? I don't think that will make a difference but don't crate engines come with the intake manifold? That may need to be changed for a TBI unit...

[profox02]

I Dont Know If It Has The Vortex Heads, Ill Find Out What It Has....also How Do I Tell What Year An Engine Is???.....do I Need To Get A Number Off The Engine???....cause I Want To Know For Sure....

[shell1990]

a 1990 motor is different b/c it is vortec fuel injection, which is alot diferent, because it is multiport injection

[shell1990]

sorry i meant 1999 motor

[profox02]

where do i find the serial number on the engine?? and does this number tell me what year, engine size, etc,..also where do i take the number to get info on it???

[profox02]

I Havent Got To The Engine, The Guy Im Buying It Off Of, Says It Was Made In '99, And He Bought In 2000...he Says It Will Drop Right In To My Truck And Its For Like... 80 Something To Like '99 Trucks...does This Sound Right???...ive Seen The Engine, And It Looks Good..its All Clean And Still On The Crate And Shrink Wraped...also Its Got A Carb On Top Of It...for 500 Bucks

[rpreston]

500 Bucks? Wow... If it's a genuine GM Crate Motor, go to gmpartsdepot.com and check out the what fits what. The regular 350 L05 I saw there said 88-98, but they had another one similar to your discription with cast iron Vortex heads with a manifold/carb setup complete with distributor. The seller is right in that whatever 350 you get, it will drop right in... The differences are whether you'll have to change computer, wiring etc. A friend of mine just swapped a 305 for a 350 in a 94 K1500. He did away with the computer and put on an old style manifold and Holley carb with a HEI distributor. Runs great...

[clampjockey]

$500 is a swingin deal. jump on it.

[profox02]

one more thing...will my 305 intake manifold fit on to the 350???...if so can i just change out the injectors???...i need to get this truck running again..quickly...so where can i find some good but cheap injectors....

[Xrrider280]

i think the intake manifold should work fine, the 305 and the 350 used the same engine block. I don't know about cheap injectors, try a salvage yard

[profox02]

I asked about used injectors at a auto recycler...they said i shouldn't mess with used ones,and get new or remanufactured injectors.....I can still use my 305 injectors...right???....but it will run lean...is this correct???