more HP from 302 ideas?

[jhv48]

The street avenger has vacuum secondaries. If you want to maximize all the power your engine can make, get a mechanical secondary carb. The carb selector on Holley's web site even suggests a mechanical secondary carb for our light weight cars. I have replaced the street avenger carbs on both of my cobras (one had a 302, the other a 427) and in both cases, throttle response increased as well as dyno results.
If you stick with the SA carb, you're leaving horsepower on the garage floor.

[dhs.buckley]

Originally Posted by jhv48

The street avenger has vacuum secondaries. If you want to maximize all the power your engine can make, get a mechanical secondary carb. The carb selector on Holley's web site even suggests a mechanical secondary carb for our light weight cars. I have replaced the street avenger carbs on both of my cobras (one had a 302, the other a 427) and in both cases, throttle response increased as well as dyno results.
If you stick with the SA carb, you're leaving horsepower on the garage floor.

i have heard this, but the fuel consumption i have been told would be almost double with the double pumper, effectively leaving me with a total range of about 125klm,
at the moment iam getting about 240-260klm out of a tank with the 465 holley which the tank hold about 50 litres

[jhv48]

Originally Posted by dhs.buckley

i have heard this, but the fuel consumption i have been told would be almost double with the double pumper, effectively leaving me with a total range of about 125klm,
at the moment iam getting about 240-260klm out of a tank with the 465 holley which the tank hold about 50 litres

Not true. I've done it twice and noticed no difference in fuel consumption. The only way your mileage will go down is if you keep your foot on the floor and leave those secondaries open. Normal driving will be the same as it is right now. But, floor it and all hell will break loose.

Just try it. Cheapest horsepower you'll ever buy. If you don't like the dp, sell it and buy the SA.

[David Hodgson]

Originally Posted by dhs.buckley

i have heard this, but the fuel consumption i have been told would be almost double with the double pumper,

Both the vac and mech secondary carbies you would use are square bore so at cruising = no extra fuel consumption, around town if your using more than half throttle = some extra due to the secondary accelerator pump activating some what, but full throttle like track work really works the secondary acc. pump so definatly more on the track - but worth it.

My 302 is out to 310 with cam, heads, mechanical pump, single fuel line with 600 DP square bore about 300 at fly wheel - goes to 6,500 quite regular without starvation.