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Cross flow Engine
robinsoncrusoe55 - 6/6/25 at 09:53 AM

1 for the crossflow engine experts ........

Can a 1600 cc head be fitted to a 1300cc engine. ?

Many thanks

rusty nuts - 6/6/25 at 10:47 AM

Yes if you have the type of head that is flat , not sure if you have the chamber type heads

gremlin1234 - 6/6/25 at 11:55 AM

if I remember correctly, changing heads between engine sizes would allow you to mix and match compression ratios, but that may have been triumph engines rather than ford.

gremlin1234 - 6/6/25 at 01:51 PM

quote:
Originally posted by gremlin1234
if I remember correctly, changing heads between engine sizes would allow you to mix and match compression ratios, but that may have been triumph engines rather than ford.

or maybe bmc engines A series

robinsoncrusoe55 - 6/6/25 at 02:47 PM

Hi rusty nuts , yes both are flat heads with combustion chamber in the head of the piston , so sounds like it's doable.

Gremlins 1234 - I think in my case , I would have to change the pistons to alter the compression ratio .

.....was just considering a head swap , because the inlet valves are slightly bigger , so head would flow better .

trialsman - 8/6/25 at 03:06 PM

I did on my engine swap. Worked great. Just make sure you swap flat squish area for flat squish area. Russ

robinsoncrusoe55 - 8/6/25 at 10:41 PM

Hi trialsman .... (Russ)

Yes , my fitted engine is the 1300cc from a mk2 Ford escort with the flat head and bowl in pistons .

Replacement head is similar design from a 1600 cc with the larger inlet valves , not sure about the exhaust valve size.

Believe that some of the earlier heads had a semi chambered design , but have not seen this type .

trialsman - 9/6/25 at 12:11 AM

MAKE SURE THE VALVE SEATS ARE HARDENED FOR UNLEADED GAS. RUSS

joneh - 9/6/25 at 06:33 AM

The 1300 and 1600 heads are the same. It was only the GT that had larger valves.

robinsoncrusoe55 - 9/6/25 at 07:34 AM

Current head hasn't got hardened seats, but using super unleaded and an additive , probably not ideal ,
but compression is still reasonable.

Hi joneh , the 1600 cc head must be from a gt , as the inlet valve head diameter is definitely larger ....
but didn't know that the non gt head valve sizes are the same. Thanks .