what block????

C

chadjett

New member
what block should i use for 500-600hp rebuild??? donor to look for in junkyard?
want to build it on the side while driving truck
 
jwaller

jwaller

Evil Genius/SyTy Guru
All stock 4.3's are the same...for that Hp you will want to convert to 4 bolt so any 4.3 will do just fine
 
C

chadjett

New member
what does converting to 4 bolt consist of or is there some blocks that are already 4 bolt. can use any year 4.3???
thanks
 
S

smeagol

Active member
You aren't going to want to use a newer 4.3 with the balance shafts (both the L35 and the LF6 have the balance shaft, and they are visibly different motors).

So basically find a core motor without a balance shaft.
 
jwaller

jwaller

Evil Genius/SyTy Guru
shit...surely you can stop this....damn it I even said it....stop it.....mommy....make them stop
 
tyndago

tyndago

New member
None are stock 4 bolt mains. I am just using 2 bolt mains and studs in my Syclone motor. Its not an all out motor - so that will work for this setup. Guy Lavy's motor is 2 bolt - he didn't push the bottom out . I am not going to go that hard so I am not too worried.

For an all out build 4 bolt mains in the center caps. Helps to strengthen the bottom end of the motor. Keeps the crank where it should be.
 
G

Guest

Guest
hey tyandgo... what are your plans for your sy and ty???
 
TurboTony

TurboTony

Active member
I bought the GM caps outta the performance catalouge. Nice caps, good price, no shipping to screw with. My engine builder likes em.

Just order the ones for the small block chevy. Two 4 bolt splayed and one 2 bolt front cap.

They don't make a steel rear cap though :???:

HTH

TurboTony
 
TurboTony

TurboTony

Active member
Doesn't GM make a 4.3 marine block that's a little tougher


As I understand it thats what a stock syty block is :wink:

TurboTony
 
S

smeagol

Active member
I've never seen any proof of such a beast, nor have I seen any indication of such differences when I've examined blocks.

I have seen some differences in the early blocks though. Take a look at the lifter valley, the gaps through to the cam area. Some are straight gaps, other old blocks have the zig zag gaps. Nothing else to indicate strength however. You can see the difference between an early block and a newer LF6 (motor with the high port Vortec heads) at my pages here:
http://www.chitownsyty.com/bg/pics/McCoy/page_01.htm

These are some pics I took when I was at McCoy's a few weeks ago. You can tell the new block by the rounded cylinder casing, and the provision for the balance shaft. I wanted to get some pics of an L35 block as well.

Might be a good start for a block guide, similar to what gnttype.org has; Sytyarchive boy, ya there?
 
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