Aluminum 4 barrel intake question

Don Jacks

Well Seasoned Member
Supporting Member 3
#2
Yes they did,the "540" was one.Very rare and pricey when found.On a very mild 409,one of our late members dyno tested one in comparison with the small port Edelbrock and the old manifold came up over 20 hp shy.The best place for them is with the absolute resto crowd as the Edelbrock was about 100 dollars cheaper than the "going' price for the 540 at the time.
 
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tenxal

Well Known Member
#3
Did Chevrolet make an aluminum 4 barrel intake for the small port 409 heads?
Well...yes. The '61 409/360 used a single four aluminum intake (3767579) that was the same as used on the '61 348/305 & 340 engines. The aluminum intakes used on the 348 305 & 340 horse engines (3753748, 3767579, 3780540) fit perfectly on the small port 409 heads.

As Don said, they will be expensive and down on power compared to the small port Edelbrock.
 

oldskydog

Well Known Member
Supporting Member 9
#6
Well...yes. The '61 409/360 used a single four aluminum intake (3767579) that was the same as used on the '61 348/305 & 340 engines. The aluminum intakes used on the 348 305 & 340 horse engines (3753748, 3767579, 3780540) fit perfectly on the small port 409 heads.

As Don said, they will be expensive and down on power compared to the small port Edelbrock.
I beg to differ. In spite of all that has been published, the 579 was a 348 intake for the 59-early 60 315/320 hp engines and the 776 was the 61 409 intake. The 3270 61 carb won't work on the 579 intake due to the throttle bore size. The late 60-61 34o hp intake was the 540. It is identical to the 776 except for the intake throttle bore configuration from 4 hole to 3 hole.
 
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tenxal

Well Known Member
#11
I beg to differ. In spite of all that has been published, the 579 was a 348 intake for the 59-early 60 315/320 hp engines and the 776 was the 61 409 intake. The 3270 61 carb won't work on the 579 intake due to the throttle bore size. The late 60-61 34o hp intake was the 540. It is identical to the 776 except for the intake throttle bore configuration from 4 hole to 3 hole.
Cecil, thanks for the clarification. I know there's some....errr....'discussion' ;) on which intake was correct for the '61 409's. So much so that I was hesitant to even put this on here.

I can only relate my single experience many years ago with the only real '61 409 I've ever encountered: the 579 intake was removed from a real '61 409. It did have the correct '61 409 #3270 carb on it. Had I not removed it myself from a local car with a known history, I would have been skeptical, too.

The rest of the car is a sad, sad story. The intake and carb were virtually the last pieces left. :cry
 

oldskydog

Well Known Member
Supporting Member 9
#12
Cecil, thanks for the clarification. I know there's some....errr....'discussion' ;) on which intake was correct for the '61 409's. So much so that I was hesitant to even put this on here.

I can only relate my single experience many years ago with the only real '61 409 I've ever encountered: the 579 intake was removed from a real '61 409. It did have the correct '61 409 #3270 carb on it. Had I not removed it myself from a local car with a known history, I would have been skeptical, too.

The rest of the car is a sad, sad story. The intake and carb were virtually the last pieces left. :cry
That's interesting. How long ago was that and do you know if it was an early or late production?
 

tenxal

Well Known Member
#13
That's interesting. How long ago was that and do you know if it was an early or late production?
Late '80's. No idea on production date.

It had literally rusted into two pieces after setting on damp dirt for so many years. It was hauled away to the crusher after the rural property had been sold.
 

real61ss

Well Known Member
Supporting Member 8
#14
Well...yes. The '61 409/360 used a single four aluminum intake (3767579) that was the same as used on the '61 348/305 & 340 engines. The aluminum intakes used on the 348 305 & 340 horse engines (3753748, 3767579, 3780540) fit perfectly on the small port 409 heads.

As Don said, they will be expensive and down on power compared to the small port Edelbrock.
All of the 305 motors that Ive seen had cast iron intakes.
 
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