Compression Ratio per Camshaft Size
When I was building my wife’s 360, I asked a few friends and forum members about the combo in which I thought I’d be driving up the dynamic ratio to high for the 93 octane. They all said to go for it.
Do realize that the engine set up plus cam size has to work with the converter, (I had a custom converter built and it’s kind of low on the stall, but works and drives great!) rear end gears (3.55’s) and tire size 26X10-15’s as well as the cars weight as driven fully loaded. Full tank of gas and people if it’s in the street.
(IDK the cars weight)
The car is a ‘67 Barracuda, manual steering, 4 wheel manual drum brakes. Looks stock, it’s all metal and carries a spare tire.
Here’s what I did. Camshaft last.
360 with zero decked KB-107’s + .030
.028 X 4.04 Cometic head gaskets
Trickflow heads - 60cc chambers
This produces an 11.41-1 compression ratio that runs just fine on pump 93.
Now the camshaft used with 1.6 rockers for a .573/.569 lift
This kind of cam has a recommended range of 8-1 - 10-1 BUT this also depends on who made the camshaft. Crane would suggest as high as 11-1 - 11.5-1 easy. Comp is a full point lower, easy. Others may even suggest it more than 9.0-1 because it’s a street grind with easy going lobes even for a roller.
The more you can get (compression) and run it on pump gas, the more return in power and mileage you’ll get. This will also require you to tune the distributor so the t doesn’t ping knock or over heat.
While I don’t call this car fast by any means, it’s more of the gear ratio holding it back from speeding down the 124 quickly.
But man o man does this thing just keep on turning rpm’s and charging the top end like nobodies biz!
There is a lot of wiggle room in this quest to the point someone may even say it’s a loaded question.
When I was building my wife’s 360, I asked a few friends and forum members about the combo in which I thought I’d be driving up the dynamic ratio to high for the 93 octane. They all said to go for it.
Do realize that the engine set up plus cam size has to work with the converter, (I had a custom converter built and it’s kind of low on the stall, but works and drives great!) rear end gears (3.55’s) and tire size 26X10-15’s as well as the cars weight as driven fully loaded. Full tank of gas and people if it’s in the street.
(IDK the cars weight)
The car is a ‘67 Barracuda, manual steering, 4 wheel manual drum brakes. Looks stock, it’s all metal and carries a spare tire.
Here’s what I did. Camshaft last.
360 with zero decked KB-107’s + .030
.028 X 4.04 Cometic head gaskets
Trickflow heads - 60cc chambers
This produces an 11.41-1 compression ratio that runs just fine on pump 93.
Now the camshaft used with 1.6 rockers for a .573/.569 lift
This kind of cam has a recommended range of 8-1 - 10-1 BUT this also depends on who made the camshaft. Crane would suggest as high as 11-1 - 11.5-1 easy. Comp is a full point lower, easy. Others may even suggest it more than 9.0-1 because it’s a street grind with easy going lobes even for a roller.
The more you can get (compression) and run it on pump gas, the more return in power and mileage you’ll get. This will also require you to tune the distributor so the t doesn’t ping knock or over heat.
While I don’t call this car fast by any means, it’s more of the gear ratio holding it back from speeding down the 124 quickly.
But man o man does this thing just keep on turning rpm’s and charging the top end like nobodies biz!
HOMERUN advice there.
Absolutely!!!!!