In 1968 I helped a friend of mine rebuild a Pontiac 421 engine from his 1965 Royal Bobcat GTO.
Friend was not mechanically inclined but eager to learn.
I was working part time at a local automotive parts store/machine shop at the time and bought the parts so as to get my discount.
Was working until 5:00 PM so advised friend to wait for me before starting reassembly but he did not.
He installed the mains and crankshaft before I arrived and told me that after torquing the mains the crank would no longer turn.
Turns out that the Victor gasket set had two rear rope seals so he installed both, one in the proper grove, the other in the grove where the oil slinger goes. Of course, tightening the rear main cap caused the slinger to badly interfere with the superflous rope seal. To make matters worse, he torqued the rear main cap to spec cracking the block in the process.
Are you ready for this: It was a Super Duty 421 block. Very rare, even then.
I used my discount at the local Pontiac dealership to order a new SD 421 fitted block. Price was nearly $200 with discount, quite a sum at the time.
FWIW, friend still has the 65 Royal Bobcat 421 complete with 4:33 gear.
Upload one or more videos to your post. Photo and video filesizes should be less than 5MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.