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V8 differences
whats the difference between a red block and a black block?
whats the difference between L34 heads, std heads and VN heads?
the holden mechanic
L34 heads have bigger valves??? vn heads and vp heads are different...... stock VN heads are designed to flow more
red motors are carby motors
black motors with carbys are the performance motors with the L34 heads found on brock models
all EFI motors are black blocks.....
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what would the difference be between a red block with L34 heads and a black block with L34 heads?
the holden mechanic
well a red block is only used on 308 carby motors.... could be main caps, oil galleries, water jackets, different mounts for the head bolts,..... holden history has alot about the changes on the engines... tried google??
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the holden mechanic
hmmmm strange...... well i know the L34 heads fit on the 304 and black 308 and have good power increases
The L34 heads were made for...... The L34 Torana, it only had one mission in life and that was to win Bathurst. It had bigger valves, better ports, The Brock "B" cast heads are pretty much similar to the L34 heads. But best of all are the injected VN style heads. If you want to make lots of power in your 304/8 get the VN heads and a big cam and good manifold and you are cranking. The black block, well at least in the VL, maybe the VK too is an "A9L" A9L is an engine code that means it's a tough block with tough L34 style rods but they are called A9L rods. The VN block runs all these strong parts too, its pretty much a detuned race spec 400hp L34 motor with even better heads and you can buy V8 VN's for under 3 grand now, it's the bargin of all time!
Too many projects.....
Well explained greenfoam, and yes the VN heads are the best flowing holden head ever produced. Aparrently the vn heads are better than the later vs-vt heads as the later ones suffered from core shift when moulded and cant be ported as far before hitting the water jackets!
Site Administrator
Core shift was in the VT and Series III VS roller blocks, not heads.Originally Posted by VN Calais 5.0
The roller blocks are the best of the lot, just have to be cautious making lots of power with one as can damage the block.
AirStrike
Selling FG G6E Turbo and buying a N/A Supra
Too many projects.....
Going to have to disagree on this one mate, i have heard from many engine shops to steer clear from vs-vt heads because of core shift! I still have to say VN heads are the best.
Site Administrator
*Goes off to dig up the info*
AirStrike
Selling FG G6E Turbo and buying a N/A Supra
Site Administrator
i know a few reputable engine builders, when clearancing stroker blocks still hit water - core shift is a always about of casting and u take a gamble with each blockThe lifter bores need to be blueprinted or "trued", well it should be done anyway to account for any core shift in the block so that everything is square. Bascially the lifter bores are filled with bronze then bored out to exact specs.I would go the VS block cheaper less issues with core shift and will fit a 3.48 inch crank without block releaving. If u wont a roller cam in the VS block come racing now make roller lifters for pre VT holden V8 blocks cost around $1400 I thinkVR or VS unless you're planning on running a roller cam.
Don't bother with VN/VP as the VR/VS blocks already have the clearancing like stated, but also have thicker webbing which makes them stronger. VT blocks do have issues with core shifting, so I wouldn't use one unless you intend on running a roller cam. Although they do seem very popular for some reason...AirStrikenoooooooooooooo
VT blocks are the worse blocks to use for big HP engines
why?
the core moulds were stuffed and you got core shift
during the casting process
(Holdens were NOT spending money on tooling for an engine that gunna be superseded!)
the reject rate for the last VT blocks was diabolical
(the same applies to the heads )
get a VR/VS block which came with the strengthening
(thicker webs etc) required for racing
Selling FG G6E Turbo and buying a N/A Supra
Site Administrator
As far as heads I didnt think they changed anything in the VT's? I thought only changes where roller cam, sequential injection, MAF sensor, knock sensor standard, swap to thermo fans and aluminium radiator.
AirStrike
Selling FG G6E Turbo and buying a N/A Supra
Too many projects.....
Ok Airstrike, well obviously by that information there is a problem with core shift in the blocks. But i have still been told that the heads have core shift issues. The later heads actually have a different part number on them, so whether they actually changed the heads or just changed the part number i dont know. They dont actually have to change the heads to end up with core shift, it could be a few things, i.e slight change of the mould, wear in the mould.
Just read your information again and in the last quote:
The reject rate for the vt blocks was diabolical
(same with the heads)
That sort of confirms there was problems with both block & heads.
Site Administrator
OOOO well either way
AirStrike
Selling FG G6E Turbo and buying a N/A Supra
Too many projects.....
That information is good to know, will have to remember all that. Can i ask where that info came from?
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the reason i ask is cos someone i know is debating whether to run a red block with L34 heads or a black block with VN head in a VL.
The Dark Prince
black with vn heads
cheers,
chev
cheers, chev
Tells it like it is.
To quote some movie... When you go black, you never go back!
Reaper
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