What should the heads be on a 318?
What should the heads be on a 318?
The stock 318 heads should be about 60cc. The 360 heads are in the 70-72cc range. This works out to a compression drop from from 8.5-1 to about 7.2-1. Severe planing of the heads to compensate for the larger combustion chamber is not usually a good idea as this further amplifies problems with the port mis-match.
Can you use 360 heads on a 340?
From what the old DC Race Manual mentioned, before 360s came out, but 340s had the 2.02 intakes, you could use the 340 heads IF you clearanced the top of the cylinder bores to clear the bigger intake valves of the 340. Bigger ports don’t always work better on smaller displacement motors, unless they are really undersized to start with.
What’s the difference between a 340 and a 318?
There were many differences between the 340 and 318 apart from the bored, which made the 340 far more powerful than the everyday 318. The six-barrel version of the 340 had extra material in the bulkheads for strength, allowing the use of 4 bolt main caps; it also had a different cam and heads.
What’s the compression drop on a 360 engine?
The 360 heads are in the 70-72cc range. This works out to a compression drop from from 8.5-1 to about 7.2-1. Severe planing of the heads to compensate for the larger combustion chamber is not usually a good idea as this further amplifies problems with the port mis-match.
How many HP does a 360 valve gain?
Hot Rod gurus did the 360/340 head swap , a cam as well and an intake. Wound up gaining something like 16 HP when all was said and done. Arruza asked if he could have a go and took the 360 valves and popped them in the 318 swirl port heads and gained 55HP.
Which is bigger 360 heads or 318 heads?
On a 318 you will have to consider the compression ratio. 360 chambers are usually at least 5cc’s bigger than the 318 heads chambers were, and I’d have to say more like 7-8cc’s bigger in the real world. So you won’t just be able to slap them on unless you don’t mind running 7:1 compression.
What kind of heads are on a Mopar 318?
Your “J” heads are 915’s (last 3 digits of the casting # is used to identify them). 915’s were ’70-’71 heads, the 974’s are the ’75-’76 version. The casting is a little different, but the valves are the same size, and the factory spec for the chamber and port volumes are the same.
Can you run 360 heads on a LA 318?
Some police LA 318’s had factory 4 bbl. & some aftermarket 318 4bbl. intakes are available too. 3. I think the modern “hot ticket” is to run magnum 318 (5.2L) heads You are correct. I’ve run 360 heads on a LA 318 many years ago because I was worried about port mis-match & wanted to run a 4 bbl. carburetor.
The stock 318 heads should be about 60cc. The 360 heads are in the 70-72cc range. This works out to a compression drop from from 8.5-1 to about 7.2-1. Severe planing of the heads to compensate for the larger combustion chamber is not usually a good idea as this further amplifies problems with the port mis-match.
From what the old DC Race Manual mentioned, before 360s came out, but 340s had the 2.02 intakes, you could use the 340 heads IF you clearanced the top of the cylinder bores to clear the bigger intake valves of the 340. Bigger ports don’t always work better on smaller displacement motors, unless they are really undersized to start with.
What kind of cylinder heads does Dodge have?
Cylinder Head, Victor Series Race, Assembled, Aluminum, Natural, Chrysler, Dodge, Plymouth, Small Block, Each Cylinder Heads, CNC-Machined, Assembled, Aluminum, 68cc Chamber, 190cc Intake Runner, for Hydraulic Roller Camshaft, Mopar, Small Block, Pair
The 360 heads are in the 70-72cc range. This works out to a compression drop from from 8.5-1 to about 7.2-1. Severe planing of the heads to compensate for the larger combustion chamber is not usually a good idea as this further amplifies problems with the port mis-match.
What kind of cylinder head does a Mopar V8 use?
The A-series cylinder heads featured polyspheric (not hemispheric as found in the FirePower engines) combustion chambers, which led to them being referred to as Poly engines.
Which is the best cylinder head for a Mopar 318?
Mopar ‘302’ High Swirl Cylinder Heads The small chamber of these heads give your 318 a higher compression ratio, which is good for both power and fuel economy. If you need to build a low compression engine, these are still the best heads to use, but run them with dished pistons.
What kind of engine does a 302 head have?
Most 302 heads are on pre-Magnum LA roller engines. These are advertised 9.2:1 motors. IIRC the 1968 318 is also a 9.2:1 engine but the rating may be more “true” on the later builds. I’ve asked a few times on both boards what the actual measured differences might be but no one seems to know.
How much horsepower does a Mopar 318 have?
A street-worthy 318 can easily make 400 horsepower, about what a lot of street 360s put out. When the engine in my 66 Barracuda needed to be rebuilt, I decided to replace the stock 273 with a modified 318. Forty five extra cubic inches equals lots more torque and horsepower, and the 318 is a bolt-in replacement for the 273.
