Selling Olds 403 build - feelers for price?

Anubis

Anubis

Royal Smart Person
Mar 30, 2012
1,443
330
83
#1
Fellow Oldsmobile enthusiasts, I am considering selling the moderately built Oldsmobile 403 long block from my 1986 442. After the LS swap I hung onto it in hopes of finding a good roller but that isn't happening anytime soon. I am now considering selling it on Craigslist or the Homecoming show in Lansing. I realize I will not get my initial investment back but looking for your thoughts on a fair asking price. Here are the details. What do you think?

Pulled out of my car in running condition for fuel injected motor - LS swap.
1979 Trans am Olds 403 with under 5K miles after rebuild
Hot tanked, line bored, .030" cylinder overbore
TRW forged pistons (9.6 : 1 compression ratio with #5 heads)
Melling high volume oil pump
MSD HEI with custom distributor curve
Nice 800 cfm Q-jet with big secondary rods and primaries. Throttle shaft is tight.
Competition cams (have specs somewhere - moderate cam lope)
Comp roller tip valve train
Edelbrock performer intake
Around 2014 I added 1968 #5 heads with 455 stainless valves, bowl port and polish.
Exhaust dividers welded for headers. Over $1200 invested in heads alone.

Before putting in another car I would install a new rear seal.
Compression is good but there is slight scoring in 2 cylinders that I will clean up with a drill hone.
There is no step at the top of the cylinder wall.


I've had this car at the track only a few times. Best time was 13.1 @ 3860 lbs at the time.
Even with the lopey cam this engine produces a lot of low end torque. Smoke the tires at will without power braking as shown in the video.

 
DROLDS84

DROLDS84

Greasemonkey
Feb 15, 2015
205
186
43
SW Michigan
#3
You should hold onto it...you'll never get what you want out of it.What do you feel it is worth?
 
My86R3gal

My86R3gal

Greasemonkey
Jan 12, 2015
149
149
43
South of Chicago
#5
I’d concur with 2-2.5k

Edited
I misread it, I thought he was selling an entire car not just the motor
 
Last edited:
C

ck80

G-Body Guru
Feb 18, 2014
626
285
63
#6
My mind puts it at 2500-3000.

If you wanted to sell it I'd recommend transamcountry.

It takes 25 or 50 posts to get it their classifieds, but, a built 403 is a drop in right up their alley. And they aren't as cheap as a lot of cutlass/regal owners.
 
4

403Olds

Master Mechanic
May 31, 2014
276
50
28
South Central Ohio
#7
That’s an impressive build, my 403 is similar in build, no idea what it’s worth, I’d agree at the 2-3k price. Just out of curiosity, how’s the ls compare in performance?
 
565bbchevy

565bbchevy

Geezer
Aug 8, 2011
5,409
2,137
113
Michigan
#8
Before putting in another car I would install a new rear seal.
Compression is good but there is slight scoring in 2 cylinders that I will clean up with a drill hone.
There is no step at the top of the cylinder wall.
I am curious with only 5,000 miles on a rebuild why is there scoring on 2 cylinder walls and did you tear it down to discover this?
 
O

oldsmobile joe

G-Body Guru
Nov 12, 2015
835
525
93
mpls
#9
they aren't as cheap as a lot of cutlass/regal owners.
hey now, i resemble that. lol but lets not point out the obvious.

however, i agree, the more you advertise it, the greater the chance of selling it.
 
Anubis

Anubis

Royal Smart Person
Mar 30, 2012
1,443
330
83
#10
I am curious with only 5,000 miles on a rebuild why is there scoring on 2 cylinder walls and did you tear it down to discover this?
Good question. I noticed it when I put the #5 heads on it. The machine shop that did the rebuild on the reciprocating assembly didn't provide adequate clearance for the forged TRW pistons. This caused slight scoring on the cylinder wall in 2 cylinders. I've been running it this way for years with no ill effects. The low mileage is due to the fact that the car doesn't get driven much. Typically 3-4 weeks out of the year to car shows and the beach.
 

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