COuple questions on 408 buildup
Thread Starter
TECH Senior Member
iTrader: (1)
Joined: Jan 2003
Posts: 9,343
Likes: 0
From: Armpit of East TX
COuple questions on 408 buildup Assembling the short block ... which way do the flat side of the valve reliefs go? What about dropping the pistons in without rings to check bottom end specs and any clearance issues. Will it hurt the cylinders or the pistons with them not having rings on??
May sound silly, but I just want to be sure on the valve reliefs.
May sound silly, but I just want to be sure on the valve reliefs.
Lightly oil the cylinder walls and piston sides as well as the rod bearings and rod journals. It won't hurt a thing. Also, lightly oil the main bearings and main journals before placing the crank in the block. It's actually a good idea to check out things like his ahead of the actual assembly. It's good to ask questions too.
Steve
Steve
Staging Lane
Joined: Jun 2005
Posts: 67
Likes: 0
From: Australia victoria
Hi on my 408 build did a dummy assembly of one piston with rings on. I know for a fact putting a piston in the bore with no rings will scratch it for sure. putting a set of rings on a piston will take all of 10 minutes. You would want to spin the crank with the rod piston bolted in to check clearences, I dont think you would acheive that with no rings. Lay your main bearings, oil bearings well with non friction mod oil, lay in crank place bearings in caps oil well and bolt a few caps down and give it a slow spin then assemble a rod and piston with rings. oil bore well slide rod and piston in its assigned bore, place in rod bearings oil well and torque bolts down give it a spin. or do what you need to check. The main area to look at is the crank reluctor wheel and piston clearence. I also put the windage tray on to get an idea how far rods will clear no nead to bolt down. good luck. Max
Ps what pistons are you using.
Ps what pistons are you using.
Originally Posted by Flyer
Flat side of the reliefs go toward the valley. 
IE the deepest part of the relief is up.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
As stated above,
To do a mock up assembly, that is what it is an assembly. Then it is blueprinted and could be torn down again for clearancing, changing bearings etc...
IMO, judging by your experience, just take all the parts to the shop and have them do it.
If you know them well they should let you watch to gain knowledge.
Otherwise the 200$$ you save from assembling yourself might cost 10X that at the end.
To do a mock up assembly, that is what it is an assembly. Then it is blueprinted and could be torn down again for clearancing, changing bearings etc...
IMO, judging by your experience, just take all the parts to the shop and have them do it.
If you know them well they should let you watch to gain knowledge.
Otherwise the 200$$ you save from assembling yourself might cost 10X that at the end.
Trending Topics
Thread Starter
TECH Senior Member
iTrader: (1)
Joined: Jan 2003
Posts: 9,343
Likes: 0
From: Armpit of East TX
The problem is I have is waiting on a ring filer. The rings are file fit and won't go right now. I'd like to check all that while I wait on the filer, but looks like I'll just have to wait.
Predator, thanks for the great advice of having it built. If I were going to do that in the first place, I wouldn't be here asking questions. You learn nothing if you never try. In other words ... you must try before you succed.
Predator, thanks for the great advice of having it built. If I were going to do that in the first place, I wouldn't be here asking questions. You learn nothing if you never try. In other words ... you must try before you succed.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Senior Member
iTrader: (1)
Joined: Jan 2003
Posts: 9,343
Likes: 0
From: Armpit of East TX
Originally Posted by mr2guru
Huh? The curve goes towards the valley (up) and the flat side goes down.
IE the deepest part of the relief is up.
IE the deepest part of the relief is up.