oldie Posted November 8, 2012 Report Share Posted November 8, 2012 (edited) In reference to 4K heads,what is the difference,if any,between a head that has a welch plug at the back of it and one that has a metal plate and screws at the rear. Are they both 4K heads? Edited November 8, 2012 by oldie Quote Link to comment Share on other sites More sharing options...
philbey Posted November 8, 2012 Report Share Posted November 8, 2012 Welsh plug head is a 3k bigport head. Old and overpriced but you can flog them for 150 bucks to some ke70 wannabe drift king!! Quote Link to comment Share on other sites More sharing options...
oldie Posted November 8, 2012 Author Report Share Posted November 8, 2012 So whats the big deal about 3k big port heads.It wont be for sale as its on an engine I want to use and I'm not interested in pulling it off. Quote Link to comment Share on other sites More sharing options...
snot35 Posted November 8, 2012 Report Share Posted November 8, 2012 They're big! That's really it. Ports at the manifold face are 30mm wide, vs around 25mm for most other K heads. Quote Link to comment Share on other sites More sharing options...
Taz_Rx Posted November 9, 2012 Report Share Posted November 9, 2012 ...will also have some numbers on the spark plug side and some shitty valve stem seals. Quote Link to comment Share on other sites More sharing options...
philbey Posted November 11, 2012 Report Share Posted November 11, 2012 I had my 5k head faced and the ports matched to a 32mm manifold for 150 bucks, which is what some people are asking for a bigport head. Quote Link to comment Share on other sites More sharing options...
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