Offshoreonly.com - CFM rating for Merc HP500 Carbs ?

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sprink58

03-15-2012 02:06 AM

CFM rating for Merc HP500 Carbs ?

Were they 750, 800 or 850 ?

I have a shot for a pair to go on my Comp Roller Cam Vortec 355's. I have run 750's on similar engines in the past with good results. I am dubious about 800 CFM or 850 CFM. Just checking to see who knows for sure what OEM CFM was.

Thanks,

John

FIXX	03-15-2012 02:15 AM

fixx

i believe 800 cfm..

Unlimited jd

03-15-2012 08:29 AM

They are 800 Holley list number 9022 same as 420s

endeavour32

03-15-2012 08:49 AM

x2. The strange ratings are on the HP series, for example the HP 950 flows 850 cfm.

Griff

03-15-2012 12:36 PM

Like was said, they are 800cfm, which IMO are way too big for NA 355's.

sprink58

03-15-2012 02:25 PM

Quote:

Originally Posted by Griff (Post 3641815)

Like was said, they are 800cfm, which IMO are way too big for NA 355's.

I agree...750 is my upper limit....and that's pushing it.

the deep

03-15-2012 02:35 PM

Quote:

Originally Posted by sprink58 (Post 3641884)

I agree...750 is my upper limit....and that's pushing it.

With mechanical secondaries i hope . In my experience a sbc does not move enough cfm at our marine r.p.m.'s to pull vac secondaries open in a 750 .

sprink58

03-15-2012 06:31 PM

Quote:

Originally Posted by the deep (Post 3641894)

With mechanical secondaries i hope . In my experience a sbc does not move enough cfm at our marine r.p.m.'s to pull vac secondaries open in a 750 .

Roger that...I'ma Double Pumper guy.:bananalove:

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