Slant *        6        Forum
Home Home Home
The Place to Go for Slant Six Info!
Click here to help support the Slant Six Forum!
It is currently Sun Jun 26, 2022 3:55 am

All times are UTC-07:00




Post new topic  Reply to topic  [ 16 posts ]  Go to page Previous 1 2
Author Message
PostPosted: Fri Jan 21, 2022 5:50 pm 
Offline
Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3560
Location: Indianapolis
Car Model:
When I got the 83 D150 from my Dad back around 2010, level ground highway pedal to metal top speed was about 70 mph. This is a short bed D150, slant, factory 2bb, a833 od transmission with 3:23 rear gears. Any kind of hill at all and one would need to down shift to third to maintain 70.
The truck had been well maintained, had about 100,000 miles on it. Those trucks are absolute bricks aerodynamically, factor in the lean burn ignition, the ridiculously retarded stock cam shaft timing and the D150's with slant motors of that era are RPM and highway challenged.
Today with the compression boost, hei ignition, a small but normally configured camshaft and a free flowing exhaust the truck will easily do 90 mph.

To the originator of this thread,
1) do an evaluation of the engine and the engine tune: when was the last time it got new plugs, spark plug wires, distributor cap, if it is still running the lean burn, consider an HEI, get a distributor with a vacuum advance and do a re curve on it for a heavy vehicle, look around for a 2 bbl carb and intake, do a compression test to understand how healthy the motor is, monitor oil consumption and so forth.
2) if it's in the budget consider an engine rebuild, get the compression up to 8.5:1, you can stay with the stock valves but get the best multiangle valve seat you can afford, replace the timing chain, install a smallish cam that is not ground retarded (by smallish, a cam less than 210 duration at .050) and install it 102 to 105 ICL, a cold air intake helps.

It will be a journey but there are folks here at .org that can offer sound advice.

_________________
Doo Ron Ron and the Duke of Earl are friends of mine.....
https://www.youtube.com/watch?v=uX8Nj8ABEI8


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 16 posts ]  Go to page Previous 1 2

All times are UTC-07:00


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited