The Saturday Speed Shop is back, and today we’re tearing into the junkyard 454 big block that’s going into the ’70 Nova project. ️This motor came out of th...
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after watching this video I KNEW he would be inundated with guys saying ,
the block should have been line bored vs trashed
Retro 5.0 made a lot more power than expected and didn't show any signs of distress. We wanted to be sure, so we took it apart.
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yes even if its a FORD small block theres things you can learn that apply to many other engines
I like the way the guy takes the effort and time to explain why he threw the block in the trash,
its rarely a question of can it be repaired, As a machinist, and welder, I'm well aware,
it's generally a question of what are my options,and what are the goals vs the time and cost?
as a machinist or engine rebuilder vs the time and cost, and resulting product we are left with,
with the machine work and parts and shop time, that the employees are required to spend, to go that route,
that's required. yes he could have used oversize bearings after line boring the block with new main caps added,
yes the registers could be rewelded and re machined, yes the damaged main cap could be replaced,
but the cost vs the resulting block strength compared to use of a good used block make that a less than ideal option;
both financially, required time frame, tool use time in the shop and resulting block, strength wise!
most older knowledgeable machine-shop owners would have given the engines owner a choice,
and stated we can repair your block for a cost of about (x) plus 1/3rd of (x) or replace the block with a used block for (X),
thus reducing the chance of a customer mis-understanding what's going on, and the cost & time delay to get the engine rebuilt
several hours of reading and understanding how and why certain things are done,
doing research and talking with knowledgeable experienced machine shops and fellow racers,
having the TOOLS and knowledge to be able to verify things were done and done CORRECTLY,
will save you many hours of wasted time and buckets of cash over time
TIM said:
Can this valve guide be repaired?
Yes, but:
you just have to be careful who works on it. the guides are replaceable but it's usually better to drill/ream to .500 and install bronze.
The factory guides are tapered, if the shop tries to press them out the wrong way the head will be cracked and un-repairable. Not only that, they're not a precision fit, they were pressed in and then bored, locating off the valve seat. When replacing them it's common to have sink the seat a bunch to get back on center. Not only that but sometimes they leak water un-repairably after...
no one can build any engine without the potential for defective parts, being an issue,
yes you can greatly reduce that potential through parts selection and careful inspection
you might try retarding the cam timing 4 degrees on the 400, engine that will only move the tq curve about 200 rpm ,
(I doubt you'll notice ) but it reduces the tendency to detonate significantly
finding and maintaining a good relationship with a knowledgeable and skilled machinist (machine shop),
is one of the best routes to building a good engine, obviously you need to ask questions take good advice and be...
http://www.enginebuildermag.com/201...ampaign=PushCrew_notification_cleaning&_p_c=1
The subject of cleaning is never far from the mind of the modern engine builder or machine shop supervisor. Obviously, parts must be as clean as possible so they can be inspected, repaired if possible and reassembled.
The subject of SAFE cleaning is a little less definitive, however. Respondents to our annual Machine Shop Market Profile tell us that the process of preparing an engine for rebuilding...
many valve train issues can be avoided with careful measurements and some basic calculations,
but I find it amazing how often I find I go to help people who, want to do precise automotive engine work, that,
don,t have even a dial caliper or machinists dial indicator and stand, or simply calipers and modeling clay available
shop carefully cam bearing tools sell for $40-$300 plus and almost identical tools car vary in price by over $120, and be awre all cam bearings in a single block may be different sizes based on the location, so pay attention as you remove them as to...
NOW FOR THE NEWS THAT YOU REALLY DON,T WANT, TO THINK ABOUT!
AND for yet another an unpleasant moment in your thought process, just ask yourself "where did all that material , metallic trash, etc. that wore off the cam lobes, lifters, cam gear go before MOST it ended up in the oil filter? What instantly comes into mind for me is the obvious question, "why did the cam or lifter wear excessively, what can I do to prevent a repeat failure" . That is the first thing to logically be determined.
A properly installed and maintained valve train and cam, even a flat tappet cam while...
do you have any idea as to the actual cylinder wall thickness after a .060 bore & hone on YOUR block?
If you don,t ID ask the machine shop to sonic test each bore
if its under .180 Id suggest filling the blocks coolant passage surrounding the bores up to the lower edge of the BRASS freeze plugs as that helps cylinder wall rigidity and ring seal,
ID strongly suggest use of a 7-8 quart oil pan and windage screen, and arp main studs on the caps sure won,t cost all that much more before its line honed, ID suggest clevite (H) bearings, as they have a fairly hard surface and...
thanks to CNC BLOCKS N/E I can repost this info
have been emailed several times asking what it takes to do the job correctly.
First we start with the main line add caps if needed line bore and finish with a line hone.
This is a pic of a 010/020 block with 2482 center caps being line honed.
Next we blue print bore the cam tunnel for over size bearings or roller bearings as this fixture locates center to center distance of the main line and cam center line and keeps the cam tunnel in line with the...
heres a post some guy had on a different web site
I dropped my l motor off at a local machine shop in atlanta. I recently moved here so the shop is new to me but looked very clean so i told them to let me know what the motor needs.
The pistons needed to be replaced. It was turbo motor and I had some detonation hurting 3-4 pistons. That was a given visually. So I told the owner to get me a price on the pistons and let me Know what deal he could get. I usually bring the shops in the last my parts to use.
So I go onto the shop yesterday to see what’s going on and they say I owe $3150.00...
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don,t get over whelmed, make a list and test adjust correct or replace each problem, 
