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Thread: 225 efi cc's
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09-09-2021, 08:38 PM #1Junior Member
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225 efi cc's
i've searched and searched, and none can give me a for sure cc number for stock 225 efi heads and 300 promax heads, it blows my mind. PLEASE can someone tell me what the ccs are and where i should be to upgrade my 225 efi to 300 promax spec?
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09-09-2021, 10:23 PM #2
Early model porting (ex notch sleeves) was all the same for 225 , 250 and 300 . So changing heads between any of the three won't get you in trouble .
Heads :
225 = 73cc
250 = some (most) were 73cc but later ones and xb's were 68cc
300 pm = 63 - 64cc
Late model (large thermostat)
225 = 73cc
250 = either 73 or 68 , what ever they had in stock .
To be fair , there was a few years where they changed port height on 250's every year , so i rekon they tried to keep compression low . Best to measure exhaust port ht. and cc your heads to see where your at if you own a late 250 .
300x = 61cc
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Bodhi thanked for this post
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09-10-2021, 06:07 AM #3Junior Member
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thank you mine is a 2001 225efi. it has the 4 butterflys. comp is around 115 to 120. the company that is gonna tune my boxs says the heads dont need to be smaller than 67cc's. whats your take on this sir?
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09-10-2021, 10:42 AM #4
Heads :
225 = 73cc
250 = some (most) were 73cc but later ones and xb's were 68cc
300 pm = 63 - 64cc
I have no idea what you are putting the motor on or how you plan to use it. Too many cooks spoil the recipe .. as my mom would say .
Your guy is following the factory numbers . If it worked for them , it should work for you ..
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10-06-2021, 02:38 PM #5New Member
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10-06-2021, 08:15 PM #6Junior Member
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10-06-2021, 10:27 PM #7New Member
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10-08-2021, 11:10 PM #8
Welcome to Scream and Fly, Mang
1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!