Can a Vortec head be used on a small block Chevy?
While these heads will bolt right on a small-block Chevy, there are several caveats that you should be aware of before you torque those head bolts down. First, these heads employ a unique 8-bolt intake bolt pattern that’s different compared to the standard small-block Chevy 12-bolt pattern, requiring a dedicated Vortec manifold.
What kind of combustion chamber does a Vortec head use?
Next, the Vortec head employs a small, 64cc combustion chamber. This is great for stock short block 350 engines like the Chevrolet Performance 290 hp 350 crate engine that uses a dished piston with a 76cc combustion chamber head.
When did the Vortec engine head come out?
For those who may be new to the game, the Vortec head was first introduced on the L31 350ci truck engines in 1996. Despite their journeyman use, these heads flow dramatically better than any other small-block Chevy production head, which makes them popular with just about anybody who wants to build a mild street small-block.
How big of a cam do you need for a Vortec iron head?
But today, even a stone stock 5.3L LM4 LS truck engine sports 0.466-inch lift, so building a street Vortec-headed small-block demands a cam with at least 0.475-inch of valve lift. But there’s the rub. The stock Vortec iron head will not tolerate more than 0.440-inch lift.
How much torque does a ZZ4 Vette head have?
But just for s***s and giggles (lol) what kinda torque and HP am i looking at with these heads. That is like the L98 vette head I think, 58cc, 1.94/1.5 head, D port exhaust ports. Standard, non vortec, around 195 cfm @0.500 lift
Which is better Dumptruck heads or ZZ4 heads?
The chamber design is lightyears better than the dumptruck heads that came before it. On an engine thats otherwise the same, I bet a set of 113 vs say… 882s, which flow similar numbers… the 113s would kill the 882s on the dyno.
What kind of Head do I need for a ZZ4?
Still a 170cc intake port, 58cc chambers, 1.94/1.50 valves (1.60 maybe?), screw-in studs and guideplates, no heat crossover/EGR passage. They are really good heads for a low-mid range power engine… make really strong torque with the typical TPI powerband (idle-5000 rpm), so a carb setup to match that would work very well too.
What kind of camshaft does a GMPP use?
To complement the cylinder head design, GMPP incorporated a steel roller tappet camshaft with .474-inch intake and .510-inch exhaust valve lift. We wondered how much more power we could get from swapping to GM’s bottom-dollar Vortec cast-iron head, and also their new “Fast Bum” aluminum heads.