318 with Edelbrok perfomer intake and 600 cfm 4 barrel, what headers please?
I was talking about street cars. I'm not saying that it's correct but look how good those 5.0 mustang's ran and they have 1 1/2" primary tube headers. What's a pain in the butt is why these magazines print information that can be miss leading
There was a test years and years ago. I got the story from a guy that was there. Take it for what it’s worth.
He was down in California and this guy was at a track testing. A car magazine group showed up to test…you guessed it…headers.
It was some 283 Chevy and I forget the car. Anyway, they had 3 sets of headers. 1.5, 1.625 and 1.750 inches.
They flogged that thing all day and guess what??? The 1.750 inch headers were the quickest and fastest. It wasn’t even close.
But guess what the article said when the test was published? It wasn’t that the 1.750 inch header was quickest and fastest, but the 1.625 header gave the best all around “feel”.
What a bunch of horse **** but that’s what happens. And just because someone does some testing, it doesn’t mean they did it correctly.
I can’t tell you how many times I’ve went to the track with guys and they struggled to do a burnout the same twice on a row. Let alone hit two or even one shifts the same.
I will say you can use a smaller tube header IF your compression is high enough. A 14:1 engine won’t need as big a header tube as a 11:1 engine. Compression ratio matters.
Also IF you follow Calvin Elston to the letter you can use a smaller tube header. I agree with him most exhaust ports and valves are way too big.
So you’d need to shrink the port and valves, make the exhaust port smaller. And then stuff the biggest intake valve you can fit
Then you have to change your cam timing to match.
