Not to long ago two people were asking about airflow numbers on the Canfield heads. Here are some numbers on the exhaust ports 1.880 valve @28 h20 310 cc head fully ported.


...lift.....................cfm

.200....................132
.300....................186
.400....................228
.500....................256
.600....................280
.650....................295
.700....................310
.800....................326
.900....................330......350 w/pipe


I sure nobodys using a camshaft that lifts the valve .800 or more lift in the marine world, but to me these numbers are incredible. I have a new respect for Canfield

How do these compare to those 'M' heads you have?

Marty,



Big M 1.880 exhaust no pipe

...Lift...............cfm

.200................135
.300................181
.400................240
.500................275
.600................294
.700................305
.800................311

I still would use the Big M or the Pro ones for a marine engine, the number are fatter in the mid lift area.

The intakes flow 415

Here are some numbers for he 350 cc Canfield heads intake side pocket port only some better blending of seats to the port would have helped the numbers ..... 2.25 intakes

.7 385
.6 370
.5 331
.4 292
.3 222
.2 148
.1 70

Hey Jim, I sure am happy you came across a couple of sets of Canfields to do a little research on. How much of a kick back do I get??????????

ssssssssssssssssssh......... someone might hear you.



Not too much R/D. I just did my normal port, WOW!

I GUESS THATS WHY KEITH EICKERT AND STERLING USES THEM. REAL GOOD FLOW #. JIM V DO U HAVE INTAKE FLOW #? IF U DO PLEASE POST THEM FOR ME. THANKS.

The numbers I have are with a 2.250 intake valve 310cc port


.LIFT...........CFM

.200............152
.300............233
.400............295
.500............344
.600............371
.700............380

I just replace the heads on my HP500's with Canfield Aluminum heads (110 cc chambers) and picked up 5 mph and a bunch of mid range acceleration in a 38' Fountain. I'm impressed.

5 MPH is about 50-60 HP. Great!!