#1 Etype Series 1 Cylinder Heads.
Posted: Wed Aug 01, 2018 10:39 pm
Are there differences between series 1 3.8 and 4.2 cylinder heads?
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Etype Series 1 Cylinder Heads.
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#2 Re: Etype Series 1 Cylinder Heads.
Posted: Wed Aug 01, 2018 11:50 pm
Nothing significant.
#3 Re: Etype Series 1 Cylinder Heads.
Posted: Thu Aug 02, 2018 2:05 am
Define "significant"
#4 Re: Etype Series 1 Cylinder Heads.
Posted: Thu Aug 02, 2018 7:03 am
Nothing significant in this case means no difference at all AFAIK
#5 Re: Etype Series 1 Cylinder Heads.
Posted: Thu Aug 02, 2018 8:05 am
Pumpkin paint colour for early 3.8
R engine number prefix for 3.8 vs 7-7E prefix for 4.2
Foundry lugs and casting/part numbers on underside
Inlet side has two large plugs on 3.8 for 3-piece manifold. This does cross the significance threshold IMO as a 4.2 would need machining to fit 3.8 screwed plugs.
Possible valley core plug difference (earliest Allen key alloy plugs switching to hex head steel)
ça suffit
R engine number prefix for 3.8 vs 7-7E prefix for 4.2
Foundry lugs and casting/part numbers on underside
Inlet side has two large plugs on 3.8 for 3-piece manifold. This does cross the significance threshold IMO as a 4.2 would need machining to fit 3.8 screwed plugs.
Possible valley core plug difference (earliest Allen key alloy plugs switching to hex head steel)
ça suffit
#6 Re: Etype Series 1 Cylinder Heads.
Posted: Thu Aug 02, 2018 9:12 am
Many thanks for all the replies, my 1965 4.2 has had a 3.8 head fitted to it in the past, just wanted to understand the implications.
#7 Re: Etype Series 1 Cylinder Heads.
Posted: Thu Aug 02, 2018 10:04 pm
#8 Re: Etype Series 1 Cylinder Heads.
Posted: Fri Aug 03, 2018 9:40 am
Excellent ! 
#9 Re: Etype Series 1 Cylinder Heads.
Posted: Fri Aug 03, 2018 5:25 pm
Donc, les gars “aucune différence” ne disent pas beaucoup. C’est curieusement calme de leur côté!
And yes, I’m sure the Brits can read French too.
Cheers to all
And yes, I’m sure the Brits can read French too.
Cheers to all
#10 Re: Etype Series 1 Cylinder Heads.
Posted: Fri Aug 10, 2018 7:43 pm
"Rien de significatif" (qui semble approprié ici) n'équivaut pas tout à fait à "aucune différence"PeterCrespin wrote: ↑Fri Aug 03, 2018 5:25 pmDonc, les gars “aucune différence” ne disent pas beaucoup. C’est curieusement calme de leur côté!
And yes, I’m sure the Brits can read French too.
Cheers to all