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#1 What are the differences between a jaguar 420 engine and etype engine
Posted: Wed Apr 24, 2019 4:13 pm
by smokey_m14
Are e type 4.2 engines interchangeable with 420 engines? Whats the same and whats different
#2 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Wed Apr 24, 2019 4:15 pm
by Heuer
#3 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Wed Apr 24, 2019 5:59 pm
by smokey_m14
Thank you so much! that answered all my questions. I have a deal I can't pass up on this 1967 engine, runs with 67,000 original miles. I'm guessing it came out of a 420 but being as my E has pitted cams and probably a pitted crank this will get us flying sooner than later.
#4 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Thu Apr 25, 2019 12:24 am
by abowie
Good choice. I have one of those tucked away as a spare. And yours should be a short stud block which is preferable. Check its engine number here
http://www.jag-lovers.org/xk-lovers/lib ... umbers.htm
#5 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Thu Apr 25, 2019 5:54 am
by chrisfell
My E has a 1967 420 sourced engine. Originally this was a 8:1, but it now sports 9:1 pistons. The car has had this engine for most of its life, probably since 1978, certainly since 1986.
#6 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Thu Apr 25, 2019 2:10 pm
by smokey_m14
Wow, according to that link I may have done better than I thought. This appears to be a Series 1-1.5 E-type engine. Came with an automatic gearbox
#7 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Thu Apr 25, 2019 2:20 pm
by Heuer
Looks like a 7F to me meaning it came from a 420.
#8 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Thu Apr 25, 2019 2:35 pm
by smokey_m14
Heuer wrote: ↑Thu Apr 25, 2019 2:20 pm
Looks like a 7F to me meaning it came from a 420.
Thanks for the image enhancement! my eyes must be getting terrible
Now we know definitively! I'm always greatful for your help and insight
#9 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Thu Apr 25, 2019 4:02 pm
by chrisfell
Mine is 7A, a Daimler badged 420.
#10 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Sat May 30, 2026 6:15 pm
by Stevemorris
So, I have been asking this question for a while now, and simply cannot find a definitive answer, can anyone tell me the actual differences between a 7F (420) block, and a 7E (S1 E Type) block please??
Ive read many different things, but nothing that makes sense??
Thanks all,
Steve.
#11 Re: What are the differences between a jaguar 420 engine and etype engine
Posted: Sat May 30, 2026 8:03 pm
by mgcjag
Hi Steve....you would need to look at the parts catalogues for both as a start to check out the part numbers....are we just talking block or engine, crank, pistons , rods etc...once you know the part number differences you can check how/if they are different.....Steve