3.1 heads the same as 3.4?

[3.4 slow to go]

Valve size, the carbed 84 H.O. heads are the same size as teh MPFI 2.8 thru 3.4 size. The 82~84 carbed standard 2.8 heads have the smaller valves.

mattsv6, don't sweat it, you brought up an alternative that could be done.

[mattsv6]

;)

[Butters]

I know its hard to say because of how much prices can vary, but whats a ballpark estimate of how much this whole thing would cost. It sounds like a sick idea, but I dont exactly have buckets of money to throw around.

[3.4 slow to go]

<blockquote>quote:</font><hr>Originally posted by Butters:
I know its hard to say because of how much prices can vary, but whats a ballpark estimate of how much this whole thing would cost. It sounds like a sick idea, but I dont exactly have buckets of money to throw around.<hr></blockquote>

is this a mis-post???

[Jerriko]

[QUOTE]Originally posted by 3.4 slow to go:
[QB]Valve size, the carbed 84 H.O. heads are the same size as teh MPFI 2.8 thru 3.4 size. The 82~84 carbed standard 2.8 heads have the smaller valves.

The 3.4 heads have larger valves than the 3.1s and 2.8s. I have had them all side by side and you can tell the difference.

[3.4 slow to go]

http://www.60degreev6.com/index.php?p=pages&pid=55
85~92 2.8/3.1
intake: 1.725"
exhaust: 1.425"

you sure you have the right yr valves?

[Jerriko]

3.4L weren't made until 93-95, not 85-92.

[3.4 slow to go]

http://www.supersixmotorsports.com/P...kDataSheet.pdf

download & check the valve sizes.

[Jerriko]

I don't know what to tell you but something is wrong with the numbers. You know that I am rebuilding a 3.4L for the Fbird. When I was porting the heads, I compared the valves from the 3.4L with the valves out of a set of 2.8L heads. The 3.4L valves are larger, both intake and exhaust.

[Jerriko]

85~92 2.8/3.1
intake: 1.725"
exhaust: 1.425"

I think you are looking at the wrong engine specs. The category for that engine is 2.8L V6 (RWD 85-93). There are several 2.8L motors listed. Notice the year, 85-93. This could not have been the F-body version. It has aluminum heads. F-bodys had the 2.8L from whatever to 89, the 3.1 from 90-92 and the 3.4 from 93-95. But the big difference is the aluminum heads. I haven't seen any 2.8Ls w/ aluminum heads.

[3.4 slow to go]

They don't list the valve size for the 93~95 3.4 (RWD) but it has valves. That's why I asked what yr the 2.8 heads are.