Hipo manifold V 351 W manifolds

[mustangman1974]

Is there a difference between 65-66 Hipo exhaust manifolds and the 351W manifolds.

Pypes makes extensions to connect 2.5 exhaust to header back kits. Supposedly they are for 351 W manifolds.

 

[Helmantel]

They're quite different, especially the location of the exits.

 

[D.Hearne]

The left sides are nearly identical, the early right 351 unit is as well from pics I've seen.

 

[bnickel]

the 351w manifolds actually flow a bit more than the Hi-Po manifolds but not a ton, but when you're talking about stock cast iron manifolds any is better.

 

[Rusty67]

Not sure about the hipo manifolds but the 351w manifolds can be ported to flow as well as just about any header.

 

[Helmantel]

They may be similar, but I don't think an intermediate pipe for 351W manifolds will fit the Hipo's. Here are some pics:

http://www.mre-books.com/interchange/interchange8.html

 

[Rusty67]

The drivers side for the 351w manifolds exit different depending on which year it is. I think 69 exits down and 70 exits straight back.... I can't remember which

 

[bnickel]

The drivers side for the 351w manifolds exit different depending on which year it is. I think 69 exits down and 70 exits straight back.... I can't remember which

close, 69 and 70 both exit down but the 69 has a kickout at the end that points it outward, 70 doesn't have that. i have no idea why they did it that way either.

an intermediate pipe won't interchange between a 289 and a 351w manifold becauase the exits are so different.

 

[mustangman1974]

damn. anybody have connections at pypes? Their presales question answer always has to goto the shop to get answer then only repeats my question back.