motor swap

[hdloner]

have a good strong buick 1986 307 carb motor   i want to put it in my 1986 c20 350  turbo 350 trans what problems will i run into

[VileZambonie]

The 307 was a total loaf. I think they had 7.5:1 compression ratio. Why would you put that in place of your 350?

[Blazin]

I agree I would opt for a half worn out 350 over a strong running BOP 307.

[hdloner]

350 has 278000 miles 307 has 10000 and is paid for

[HAULIN IT]

Hdloner, I pretty much agree with the other guys, however the 307 Olds (not Buick, it may have been in a Buick,but it's an Olds ) for the most part, is a good longevity engine, not the best choice for a truck necessarily though. Since you asked, the basics are this. You will need Olds-based diesel mounts (mid-late '70's) or make adapters like I did (a plate across the three bosses on the block w/studs) or move the lower half on the frame plate (I did my 4x4 this way). A transmission adapter (Trans-Dapt, makes two, the 3/8" thick one is the one you want), the battery should be moved to the Left side. The accessories will interchange, you will need to lengthen a few wires,hoses,ect. The exhaust will work out fairly well, as well as the fan shroud,ect. also. It is a do-able weekend swap if well prepared, but I don't think I'd bother, now a 350-455   Lorne

[Stewart G Griffin]

This, in my opinion, will be a cool swap.  Even though i'm a "chevy person,"  i'm obsessed with anything GM. i'm a "GMphile."  i'm obssesed with B.O.P. (especially P) and Cad, and of course, GMC.  (Although, today's GM leaves a lot to be desired, but that's a topic of a whole other post....)

1) Anyways, i was wondering why the battery should be moved to the left side?


2) We have to remember that the last 442 had a 307 which pumped out 180horse and about 235lbs or torque.  Yes, i realize that the cutlass was about 1000lbs lighter than a fullsize truck, but still.

If the 350 is still running, i would wait until it needs a rebuild before swapping it out though.

[red4wd]

1) Anyways, i was wondering why the battery should be moved to the left side?

because they have the starter on the left side of the engine

[plowking_90]

i had a olds 350 rocket in a truck before it was a good running motor but was gutless. my opinion i would find a chevy 350 and junk the 307 you would be better off with a strait 6 then the 307

[VileZambonie]

My buddy has the original 307 we pulled out of his 84 Hurst Olds and he asked me what he should do with it. Now if he only had a boat... lol

The 307 is a pig, poor performance, poor mileage and is just a lousy choice for a swap even if you do already own it. You can freshen up your existing 350 to bring new life to it for probably around $400 bucks.