'67 El Camino H/SA

goinbroke2 · 10-24-2017, 11:16 AM

Dave, you're running a Cleveland though and milled or not the open chambers have slow flame propagation and poor mix. I would think that would add a new dimension into the whole thing compared to a smaller chamber chev.
Compared to a Windsor, the bigger chamber Cleveland liked more timing all through the rpm from what I remember too.

For comparison sake, I built a 289 with 260 heads and it was quickest with 28*. Small efficient chamber required little advance (didn't breath worth squat even with the 1.78/1.48 valves put in) Would nose over around 6000 regardless of cam/carb/exh/etc but man it would go from idle to 5800 like a fuel motor!

10-24-2017, 11:16 AM	#31
goinbroke2 Senior Member Join Date: Mar 2002 Location: NS CANADA Posts: 902 Likes: 1,722 Liked 405 Times in 158 Posts	Re: '67 El Camino H/SA Dave, you're running a Cleveland though and milled or not the open chambers have slow flame propagation and poor mix. I would think that would add a new dimension into the whole thing compared to a smaller chamber chev. Compared to a Windsor, the bigger chamber Cleveland liked more timing all through the rpm from what I remember too. For comparison sake, I built a 289 with 260 heads and it was quickest with 28*. Small efficient chamber required little advance (didn't breath worth squat even with the 1.78/1.48 valves put in) Would nose over around 6000 regardless of cam/carb/exh/etc but man it would go from idle to 5800 like a fuel motor!