Are 781 big block heads good?

The 781 heads are the best cast iron large oval port heads GM ever produced for the big block Chevy engine. They are worth rebuilding and respond well to pocket porting, bowl blending and larger valves. They will easily support over 500 horsepower. They are a very desirable street head.

How much horsepower does a cam add to a 454?

The 454 responded very well to the cam upgrade, as the peak numbers jumped from 376 hp and 482 lb-ft with the stock cam to 428 hp and 507 lb-ft of torque.

Are 781 heads open or closed chamber?

The ‘781 is the best choice for a 396 because it has the smallest open combustion chamber to help with static compression. Depending upon the year of the block you will have small dome pistons to make 11 to 1 compression with a closed chamber.

How much HP can a built 454 make?

Surprisingly, the 454 laid down an impressive 330 horsepower and 475 pound-feet of torque. Naturally, the truck-based 454s were tuned for torque, so having nearly 500 pound-feet wasn’t a big surprise. But like any stock engine, there was tons of power left to be squeezed out.

What size valves are in 781 heads?

All 781 or 049 all come from the factory with 2.06 and 1.72 valves. The hot set up for these heads is to install 2.19 and 1.88 valves. They make a tremendous amount HP with the right boyyom end.

What CC are 781 heads?

The 781 heads have 256/114 cc port size runners, with 118cc combustion chambers.

How can I get more power out of my 454?

How Do I Get More Power out of a Chevy 454?

1. Improve the fuel and air intake system. The more fuel and air you are able to get into your Chevy big block engine, the more power it will be able to produce.
2. Replace the stock exhaust system with a high-flow system.
3. Replace the stock timing parts with ones tuned for racing.

How do I get more power out of my 454 vortec?

How to Make a Chevy 454 Vortec More Efficient

1. Switch to a lightweight synthetic oil.
2. Install a high flow air filter and cold air induction intake.
3. Use a set of long-tube headers (exhaust manifolds) and an aftermarket exhaust system.
4. Install an aftermarket windage tray in your engine.

Which is better open or closed chamber heads?

Open and closed chamber cylinder heads differ in combustion chamber capacity. Although open chamber cylinders offer easier flow, the closed chamber cylinder is better for performance. Compression ratios are also affected by the size of the chambers.

How much does it cost to rebuild a 454 engine?

How much does it cost to rebuild a 454? Engine only to rebuild including no labor to remove & replace or related parts is about $3000.00 on up depending on exactly what you want, this does include the oil pump as no rebuilt engine will not include one. total job will be $6000.00 plus.

Are 049 heads good?

For mild street and budget bracket big block Chevy 454, the factory iron 049 heads are outstanding; if they were cast in aluminum, they would be ideal. Big block Chevy 454 heads feature what are referred to as good and bad intake ports.

Are 049 heads oval port?

IMO, the 049 is among the very best oval port heads for a mild performance or extra-duty application. They have the “good” chamber (open, large quench pad) and large ports. Adding 2.190 intake and 1.88 exhaust valves with a nice blend really “wakes them up”, especially on a larger engine.