Re: 4.0 vs 4.2 headers...different size? Can't swap?

[farna@xxxxxxx]

The header will "fit" a 199-258 head, but the 4.0L ports are much smaller. It will work, but will restrict flow some. I don't know if it would be any gain over a factory exhaust manifold, but shouldn't be any worse! Port sizes may not match well, but then it'sa better flowing design. The older heads have bigger ports but don't flow as well as better designed 4.0L ports. 

On June 25, 2005 Jerry Casper wrote:

> I was at Cecil COunty, and bought a stainless steel
> header, might fit a Gremlin, I thought, someone else
> had bought one from the same guy, both used, he said
> they would only fit a 4.0 head, he had a 6-cylinder
> drag Gremlin. The center ports were spaced closer on
> the 4.0 head? This header is awesome, the flange is
> 1/4" THICK. Nice lookin' 3-inta-2-inta-one design,
> compact and clean. If it won't work on the 4.2 head, I
> guess I"ll have to consider an upgrade down the road,
> as this is one sweet piece of hardware. Only paid $10
> for it ( the other guy paid $5 for his ). Worthwhile
> investment, I think. Anyway, just wondered if it was
> true the spacing on the 4.0 head was different than
> the 4.2 exhaust ports. Thanks for any more info,
> 
> jerry Casper
> 
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