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Early v Late SPRINT cylinder heads - differences ??
Posted: Tue Apr 19, 2016 7:57 am
by simonhorton
I have a few Sprint cylinder heads
What are the visual differences between the two ?
I know late heads have a number "2" stamped on them
Many thanks
Simon
Re: Early v Late SPRINT cylinder heads - differences ??
Posted: Tue Apr 19, 2016 9:22 am
by trackerjack
Very early ones had shallower spring seats, which when used with uprated camshafts wrecked the head due to spring coilbound problems.
I also think the waterways were enlarged but I am not sure.
Re: Early v Late SPRINT cylinder heads - differences ??
Posted: Tue Apr 19, 2016 10:03 am
by matienzo
See Mikes restoration thread
viewtopic.php?f=19&t=7537
Re: Early v Late SPRINT cylinder heads - differences ??
Posted: Tue Apr 19, 2016 1:10 pm
by simonhorton
I have put both heads side by side
The only difference visually is the extra casting above the exhaust ports on the later ( number 2 casting number )
Simon
Re: Early v Late SPRINT cylinder heads - differences ??
Posted: Tue Apr 19, 2016 2:27 pm
by James467
Have a look at my thread about early vs late heads, I think there's a link to Mikes thread as well.
viewtopic.php?f=19&t=27969&start=345
I have had a problems with the spring seats on my early one being too high, they really need to be machined down but as I now have a late one I'm just going to use that.