Depends on what you want. A single plane (xcelerator) will give better flow and a broader power band but less drivability. The air gap will give more torque and better drivability as well as a cooler inlet charge hence better VE. Really I would go for the air gap, the excellerator is a good manifold but is getting a little dated now.
Air gap for outright performance and I reckon X-Cellerator for power and better economy. I find all Ford engines need a torker for show and go. The Performers seem to give u like 1 litre to 100km off but much less power and xcelleration.
I was told today buy my machine shop about an aussie made single plane air gap manifold that's proven really well on strokers. Don't know what brand it is but can find out if you want. I'm probably gonna get it when money allows.
Assuming carb type manifold:-
For 351 block is true, but for 302 block thay have the same diameter runners and almost same runner length, I use 302 RPM air gap rip off w porting, works well, torker 2 is really bad my .02c
Last edited by blue66coupe; 08-28-2004 at 04:06.
Reason: Assuming carb manifold
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