[oldman]

Originally Posted by GuywithL86

Just so you know (i had a major ah ha moment when I learned this) that is not really true.

Hose A- 50ft 2” diameter hose
Hose B - 50ft 3” diameter hose in which in the middle there is a few inches of 2” diameter (aka a 2” restriction”)

Despite what you’d think, hose B would crush hose A in flow.

It’s not just the diameter, its the length at that diameter

but we are talking collector, where all 4 flows converge, the Vette has a significantly bigger collector.

All four "hoses" on the Vette manifold are much bigger.

The two things the Camaro has going for it are:
1) It is a try-y design which helps midrange torque
2) most of its tubes are longer, which helps mid-range.

The bads, it has many twists and turns and the merges are not as smooth as the Vettes; which is basically a big oval collector with completely linear merges flows (ideal).

I measured the internal primary tube it is a rounded corner square cross section 1.2" x 1.4" about 1.7 sq inches lets just call this a 1.5" ID or 1.6 OD tube ( 1 and 5/8 header). Really not too bad. The ported Vette was 2"ID or 85% more cross-sectional area. Have no idea how big the unported entry is nor the rectangle cross-section of the port would be.

[cmitchell17]

Originally Posted by oldman

but we are talking collector, where all 4 flows converge, the Vette has a significantly bigger collector.

All four "hoses" on the Vette manifold are much bigger.

The two things the Camaro has going for it are:
1) It is a try-y design which helps midrange torque
2) most of its tubes are longer, which helps mid-range.

The bads, it has many twists and turns and the merges are not as smooth as the Vettes; which is basically a big oval collector with completely linear merges flows (ideal).

I measured the internal primary tube it is a rounded corner square cross section 1.2" x 1.4" about 1.7 sq inches lets just call this a 1.5" ID or 1.6 OD tube ( 1 and 5/8 header). Really not too bad. The ported Vette was 2"ID or 85% more cross-sectional area. Have no idea how big the unported entry is nor the rectangle cross-section of the port would be.

Thanks for the info. My question would be first that GM went through the trouble of making a different manifold for the ZO6 and ZR1 vs the regular Corvette LT1 manifold? I wonder the same thing about the airbox and other things, the part numbers look identical. Also I think the Corvette NPP exhaust sounds way better than the Camaro's NPP makes me wonder how hard it would be to convert mine over to a Corvette NPP.

But anyway the fact that GM redesigned so many parts specific to the ZO6 (and I am assuming the ZR1) proves to me there is room for improvement.

[L78toLT1]

Originally Posted by cmitchell17

Thanks for the info. My question would be first that GM went through the trouble of making a different manifold for the ZO6 and ZR1 vs the regular Corvette LT1 manifold? I wonder the same thing about the airbox and other things, the part numbers look identical. Also I think the Corvette NPP exhaust sounds way better than the Camaro's NPP makes me wonder how hard it would be to convert mine over to a Corvette NPP.

But anyway the fact that GM redesigned so many parts specific to the ZO6 (and I am assuming the ZR1) proves to me there is room for improvement.

Pure speculation on my part as i have no experience with LT1 corvettes, but packaging is most likely why the manifolds are different.

[oldman]

Here is a large cam similar (less overlap) to a GM hotcam, 90% stock exhaust, I have a CA front cat delete on the driver's side to test part throttle E85.... sorry
https://youtu.be/AfoP1LPXdUo