Are 305 Vortec heads the same as 350 Vortec heads?

Different, basically the L31, 350 Vortec head is a new design with different ports and chambers. The LO3, 305 is the same old 305 head with a new name.

Will 350 Vortec heads work on a 305?

There’s both 350 and 305 vortecs. Heads from both these engines would physically bolt on to a 305, but bolting a set of 350 heads onto a 305 would hurt performance more than anything. The heads off a 305 vortec are actually pretty decent heads for a 305, and if you’re set on vortec heads, those are the ones you want.

Can I put Vortec heads on a 350 TBI?

The heads will bolt to the block fine but you will need a specific intake manifold. Either the gm TBI/vortec intake or a vortec intake for carbs and use an adapter for the tbi. If you use the carb intake you will loose the EGR. You can keep it with the gm intake.

Are 350 heads better than 305?

305 heads on a 350 will raise your compression a good deal, maybe even too much for pump gas if you have flat tops or domed. I would go with 350 heads if I were you. If you have flat top pistons a set of 350 heads would be best.

What’s the difference between a 350 and a 350 Vortec?

The regular 350 head uses a 90 degree bolt angle while the Vortec uses a 72 degree bolt angle. When the head is bolted to the engine, all the attachment bolts point straight up, as experienced mechanics know.

Is a Chevy 305 a good motor?

Is the 305 Chevy engine a good option? The 305 Chevy engine has a lot of potential as a good engine, with a lot of options and customizations that can help to increase overall power. Though it may not compete as well with larger-displacement engines, it can still deliver plenty of power, despite its smaller bore size.

What happens if you put 350 heads on a 305?

Virtually any 350 heads will work on a 305. The high compression 350 heads are similiar in combustion chamber size & intake valve size to the 305 heads & will give a 305 the same performance as if using 305 heads.

How do I get more power out of my 305 vortec?

Bolt-on Upgrades

1. Replace the exhaust manifold. The stock exhaust manifold of the 305 engine restricts air flow from the engine increasing back pressure.
2. Replace the intake manifold and carburetor.
3. Add cold air induction.
4. Replace the computer chip.

How much HP can a 350 TBI handle?

The 350 TBIs only flow like 475 cfm, but can be bored to flow ~650 cfm. The bored TBI with the bigger injectors (96 lbs), the right chip, and a bumped up fuel pump (20 psi), should be able to support 345 hp (according to John’s calculations).

Can you convert a TBI to a Vortec?

The Vortec intake manifold has taller ports, and the TBI manifold doesn’t cover the openings. Some people have proposed welding to build up the top outer edge of the TBI port and then porting the inside to match the Vortec port, but that’s a lot of welding on an aluminum intake.

What happens if you put 305 heads on a Chevy 350?

The combination worked out ok. It ran well and made good power. The 305 heads I used had a smaller combustion chamber than the 350 heads that were on the motor originally so it bumped the compression a little. The downside was the heads also had smaller valves so that was a bit of a disadvantage.

What happens when you put 305 heads on a Chevy 350?

If you have flat top pistons in that ’70 350, the small chambers of the 305 heads may raise the compression ratio too high for 92 octane. Once you pull the heads off the ’70, you can determine if you have flat tops or dished pistons. If you have dished pistons, no problem.

Can you put 305 heads on a 350?

305 heads on a 350 – MR. WELLWOOD’S SHOP OF HORRORS You will find lots of hate on this one. Putting 305 heads on a 350 was a good way to bump compression back in the day when compression was low, and aftermarket heads were almost “unattainable.”

How much does a 350 Vortec head cost?

If your plan is to buy new Vortec heads the formula changes. It costs no more to rebuild a 350 so you might as well start with a 350 if you can find one. A core will be $100-$200 and that is a cheap way to get 45 cubic inches.

How big are vortec heads on a 305 roller?

305 roller w/L31 Vortecs is what im considering for my ’41. Good power and Better mileage. Now a 3×2 is available for Vortecs too. Unless they have been upgraded to 2.02, I think vortecs all have 1.94 intake as max size.

Can a 350 Vortec block be machined over?

It has been machined .030 over, new freeze pluge and oil galley plugs, and new cam bearings. It is a vortec block and I also have the vortec heads. block is totally ready to be built.