|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
02-17-2013, 08:48 PM | #1 |
Senior Member
Join Date: May 2010
Posts: 416
|
Holley optimum size for a 256 Merc.
I have a Holley 1848 (465 cfm) carb and was wondering if I should be looking for a Holley 390 cfm instead. It's for a stock 1954 256" Merc with 3 speed overdrive tranny. I already have the ECZ-B 1957 intake to install it on. Thanks : Bruce
|
02-17-2013, 09:40 PM | #2 |
Senior Member
Join Date: Jul 2011
Location: Redondo Beach, CA
Posts: 5,849
|
Re: Holley optimum size for a 256 Merc.
The 390 may be better for the 256. Two things, you will need a 57 up distributor and ensure you get a good seal on the intake. The B manifold has much larger ports that the 256 manifold and may not seal properly to the 256 heads.
For sure you will have miss matched ports. Just my 1¢ worth. |
Sponsored Links (Register now to hide all advertisements) |
|
02-17-2013, 10:07 PM | #3 |
Senior Member
Join Date: May 2010
Posts: 416
|
Re: Holley optimum size for a 256 Merc.
Thanks : Should I keep the stock 256 intake with a carb adaptor, put up with the mismatched ports of the later intake, or hog out the ports on the head to match the later intake (without removing the heads)?? I already have switched to the '57 up distributor. Bruce
|
02-18-2013, 01:51 AM | #4 |
Senior Member
Join Date: May 2010
Location: Phoenix,AZ
Posts: 1,417
|
Re: Holley optimum size for a 256 Merc.
Sponsored Links (Register now to hide all advertisements)
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|