[opelbits]

I should clarify my thinking on the tubular sprint idea.

It works for FI and carb. It is a multifit item, one pattern for GT/Kadett/Model 50. It should (in theory) be a direct swap with the stock cast iron manifold.
Flows better (again, in theory) than the stock manifold with heat riser, hopefully as well as, or better than, the stock FI manifold.

However, I would not think it would perform as well as a decently designed header. But, not everyone is looking for a full header and the required exhaust work. I may be wrong on this point, but the well designed performance header sought by so many may have disadvantages on a stock or mild motor. Paul is correct about the cost probably being as near to equal as makes no difference. But to use the nice header may require upgrading other things. Bigger carb (at least rejetting), headpipe and exhaust work, intake manifold work, etc. I guess the question here is what sort of header is wanted? A nice header for a stock/mild motor, or one that gets the most out of a hi-comp (10.0 +), big cam, big valve, big carb motor? Can it be the same header for both?

The cast iron FI manifolds have been increasing in price over the past few years. I sold one about 5-6 years ago for a little over $100. Now I see them going for $150-$200. I doubt the prices will come down as they get more scarce, but they seem to sell pretty quickly. It would be interesting to know how much traffic there is in FI manifolds at OGTS and the other suppliers. The 2.2-2.4 manifolds can be pretty pricey. I figured a tubular sprint replacement would be popular, especially if there is the option of a larger headpipe flange.

Gumby- I didn't mean for the thread to drift of topic. Plese keep my name on the list for two flanges!