Offshoreonly.com - mild build 454

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - mild build 454 (https://www.offshoreonly.com/forums/general-q/359701-mild-build-454-a.html)

AllDodge

03-23-2019 05:04 PM

Finding the 29 outlaw weights 6800 with twin BBC, so if the boat doesn't catch air, 450+ should not be an issue on the drives

Griff

03-24-2019 01:27 AM

I would contact Top Quality Source for Boat MEFI ECU Tuning | CO, KS, OK, TX, NE, AR, MO | MEFI Tuning and see if they have an ECM tune already written for what you are building with one of the listed cams.

F-2 Speedy

03-24-2019 08:38 AM

Quote:

Originally Posted by Rookie (Post 4678408)

I'm putting together 2 Merc 420's currently and the only thing I'm changing are the cams and going to hydraulic roller lifters. I'm using HP500EFI cams, Crane 169621. Great minds think alike. It looks like a great combination.

Are the 420's 454 cubes ? what heads are you running on these.

F-2 Speedy

03-24-2019 08:41 AM

Quote:

Originally Posted by Griff (Post 4678449)

I would contact Top Quality Source for Boat MEFI ECU Tuning CO, KS, OK, TX, NE, AR, MO MEFI Tuning and see if they have an ECM tune already written for what you are building with one of the listed cams.

I've done business with Ben.....good dude

F-2 Speedy

03-24-2019 08:52 AM

I noticed the specs are the same on the 168761 and 169621 112lsa

Rookie

03-24-2019 10:37 AM

Quote:

Originally Posted by F-2 Speedy (Post 4678466)

Are the 420's 454 cubes ? what heads are you running on these.

Mercury 454's similar to your mag motors, GM rectangle heads, flat cam, roller rockers, single plane 800carb and better exhaust.

getrdunn

03-24-2019 02:42 PM

Quote:

Originally Posted by Rookie (Post 4678478)

Mercury 454's similar to your mag motors, GM rectangle heads, flat cam, roller rockers, single plane 800carb and better exhaust.

i ran that same platform for years. Was a 4 mph plus gain over the 454/365 in a single 24. Then stepped up to dart oval port heads with the 502/465 cam and lightning headers. That was an awesome combo and made great power.

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