stock syty block prep tips for builder

[93ty475]

does anyone have any important tips to share regarding 4.3 block prep? the most detailed info i think i've found so far is on the huryde site under "engine" and "build specs"...

my main concern here is the chamfered oil holes and passages...how critical is this?...is the info below syty specific? we are at the point now to where any proven block mods should be adressed in the next week or so...my builder is open to any suggestions or recommendations from experienced syty people...he doesnt normally build turbo 4.3's...any suggestions? what about removing the casting parting line on the crank? is that critical? i will be running a stock crank that is standard/standard...

heres some of the huryde site info:

oil galley plugs "staked" in place or block peened around them
.030 over bore
line bore checked and honed if needed
standard rod/main journal crank
chamfered oil holes(can be done at home)
removed casting parting line on crank(can be done at home)
Melling Z28 oil pump(standard volume with a higher pressure bypass spring)
Smoothed/chamfered oil galley in lower section of pump(done at home)
One piece oil pump drive(integral sleave)
Smoothed oil passage on rear main and chamfer(done at home)

thanks,

 

[skata]

BALANCE the rotating assembly.
if money permits, heat treat and prep the crank.
if you have more money, convert to 4 bolt mains.

 

[myclone]

I wrote that....however keep in mind that all the stuff I listed as "can be done at home" are things it sounds like you will have to pay to have done so those things arent an absolute necessity(sp?) IMO for a stock-ish hp level.

Also, some/all of the things listed are my personal preferences and some ppl may not want to do them or agree with doing them. It depends on the builder really.

So, to possibly answer your question if I were in your shoes then I would tell the engine builder to do the things he feels is needed when building a stockish bottom end SBC that will get beaten on from time to time and be installed in a vehicle that cant spin the tires (tire spin saves parts that are only marginally adequate in strength). If he is familiar with a cast cranked SBC then he should have no problem building you a fairly reliable turbo 4.3 IMO.

.

 

[scotts4]

I am in the same boat i am dropping my motor off in th morning.

I polished the oil pump in let to the block cleaned all the flashing in the lifter valey


This is what my rebuilder sugested to me.

Block work
bore .030 over whith torque plate
mill block deck surface
double boil and install cam bearing freze out plugs
install spaid steal caps and line bore

crank work
check for straightness and mike
polish and boil
magnaflux


balancing pistons rods crank
and cc the chambers in my heads to get some ross piston at 8.5 to 1
i will be aaaemling the motor my self. any other motor sugestion
forgot to add i am goinf eagle rods 412 cam vortec heads. thats what my rebuilder said i should do so hopes it helps

 

[93ty475]

thanks myclone,

i had wondered who wrote that...good write up...i mentioned it to him a while back and he asked if i could possibly fax it to him...little things like the oil pump type and what not...if you don't mind, i'd like to send him a copy anyway...my hp goal is around 425 or so...buildup is in my sig under sy733....not exactly stockish, but not 700hp either...i just don't want anthing to come unglued after all of this time, money and effort...

thanks,

 

[93ty475]

I am in the same boat i am dropping my motor off in th morning.

I polished the oil pump in let to the block cleaned all the flashing in the lifter valey


This is what my rebuilder sugested to me.

Block work
bore .030 over whith torque plate
mill block deck surface
double boil and install cam bearing freze out plugs
install spaid steal caps and line bore

crank work
check for straightness and mike
polish and boil
magnaflux


balancing pistons rods crank
and cc the chambers in my heads to get some ross piston at 8.5 to 1
i will be aaaemling the motor my self. any other motor sugestion
forgot to add i am goinf eagle rods 412 cam vortec heads. thats what my rebuilder said i should do so hopes it helps

is your builder just doing the shortblock? are you assembling the rest? i decided to let them do only the shortblock...i personally want to tackle the rest...mainly because i took it apart...shouldn't be a big deal and wont be my first time...the machining and shortblock stuff is not my department though...im more of a bolt-on guy from the heads up...

 

[scotts4]

they are doing just the machine work and i will be doing all the assemble my self i have pit together alot of motors so i just want thing to be right

 

[E-Rue]

there are guys that rebuild motors, and then there are guys that eat sleep and shit motors. there are a lot of things that go into preping a bottom end, and i suggest you find someone that really knows his stuff. its worth the search believe me. they wont want to tell you all their secrets, but they should be willing to show you enough for you to know they are very serious about their work. take a look at the attention to detail in this rear cap...... and good luck in your search.

e

 

[93ty475]

thanks for the reply's

my builder doesn't have much of a website, but their home page pretty much describes what they cover...they also have a fullblown automotive machine shop, in house...also do flow bench work...it's the best shop I could find within a reasonable distance...they're 200 miles from me...we have a few shops in my city, but they suck, and i've heard too many horror stories...

www.jankesengine.com