Are there 5A heads on an Oldsmobile 307?
Are there 5A heads on an Oldsmobile 307?
The 6A and 7A heads fit the later (’85-’90) roller lifter 307s. The intake gasket sets are different. There should not have been any factory installed 5A heads on ’85 Toros. All should have been roller lifter engines with the 7A heads. The last year for “Y” code 307s with the conventional valvetrain was ’84.
When did the Olds 307 go out of production?
The 307 stayed carbureted until the bitter end of production (1990). Every 307 used a 4bbl carb – there were no 2bbl models. The last of the GM 4-bbl engines and the last GM carbureted engine. In fact, it came on the Caprice wagon, Olds Custom Cruiser wagon, Buick Estate wagon, and Cadillac Brougham (5.7L Chevy V-8 was optional on this one).
What was the engine number on a 1967 Olds C head?
If it’s an A, B, or C head, look for the engine unit number/ID code as detailed in the Blocks section under Big Block Unit Numbers. 1967 C heads had this number; 68-9’s did not. So, if your C head has a stamped ID like V2023456G in figures about ¼” tall, that’d be from a 1967 400-4V, possibly a W-30.
When did the Chevy small block engine come out?
Small-Block Chevy Cylinder Head Identification By Randy Bolig December 12, 2018 When GM first introduced its small-block engine to the world, it was specifically designed to give Chevrolet an edge over Ford’s flathead V-8.
What kind of heads did an Olds 307 use?
The 5A heads were used on the ’80-’84 “conventional” (non roller) 307. The 6A and 7A heads fit the later (’85-’90) roller lifter 307s. The intake gasket sets are different. There should not have been any factory installed 5A heads on ’85 Toros.
What are the dimensions of an Oldsmobile 307?
Engines with roller lifters have a 0.921 lifter diameter and a 7.718 pushrod length. Spring free length is 1.960 inches or 2.090 inches, depending on whether the engine is a Type Y or Type 9. Besides having two types of lifters, the Oldsmobile 86 307 cubic inch motor has two types of heads and two types of engines.
The 307 stayed carbureted until the bitter end of production (1990). Every 307 used a 4bbl carb – there were no 2bbl models. The last of the GM 4-bbl engines and the last GM carbureted engine. In fact, it came on the Caprice wagon, Olds Custom Cruiser wagon, Buick Estate wagon, and Cadillac Brougham (5.7L Chevy V-8 was optional on this one).
If it’s an A, B, or C head, look for the engine unit number/ID code as detailed in the Blocks section under Big Block Unit Numbers. 1967 C heads had this number; 68-9’s did not. So, if your C head has a stamped ID like V2023456G in figures about ¼” tall, that’d be from a 1967 400-4V, possibly a W-30.
Is the 350 head the same as the 5.7 Vortec?
Vortec heads instantly added 55 or more horsepower to a regular 350 head with the same displacement. Automotive enthusiasts are quick to note that the 350 and the 5.7 Vortec are essentially the same engine with the same displacement. The 350 designation is the cubic inch measurement that also translates to 5.7 liters.
Can you use 350 heads on a 307?
If they are, you’ll lose compression and the power output goes down. 307 heads are the bolt-hole accessory versions of 283 and 327 2 bbl heads with 1.72″ valves. You can use 1.94″ valve 350 heads on a 307 with zero problems, but you will need the 64cc chambers and flat top pistons to keep any compression.
How many horsepower does a Vortec head add?
This technology created a vortex or pressurized swirl of fuel and air mixture inside the combustion chamber that enables the engine to produce more power while still gaining a marginal amount of fuel efficiency. Vortec heads instantly added 55 or more horsepower to a regular 350 head with the same displacement.
Can you use vortec heads on a 350?
With a 8 bolt vortec intake, sure you can. Yes the 1996-02 L31 350 vortec heads will bolt to ANY gen 1 350 engine. I just did this conversion last winter. Block was a 1969 350 4 bolt main. May as well do the cam also. You’re more than half way there when you do the top end swap. The vortec’s with the XE268H cam really woke up the engine.
The 6A and 7A heads fit the later (’85-’90) roller lifter 307s. The intake gasket sets are different. There should not have been any factory installed 5A heads on ’85 Toros. All should have been roller lifter engines with the 7A heads. The last year for “Y” code 307s with the conventional valvetrain was ’84.
If they are, you’ll lose compression and the power output goes down. 307 heads are the bolt-hole accessory versions of 283 and 327 2 bbl heads with 1.72″ valves. You can use 1.94″ valve 350 heads on a 307 with zero problems, but you will need the 64cc chambers and flat top pistons to keep any compression.
Can a Vortec intake bolt to a 350 Block?
Click to expand… With a 8 bolt vortec intake, sure you can. Yes the 1996-02 L31 350 vortec heads will bolt to ANY gen 1 350 engine. I just did this conversion last winter.
