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AFR 521

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Post  TPayne366 November 9th 2021, 10:20 pm

My 521 with AFR 280s goes on the dyno tomorrow. The heads have had some work done to them as well as the intake. Running a solid Roller setup with mid 270s at .050 and .730 ish lift. I am running the 4150 manifold with a 1050 4150 style carburetor. Compression ratio is 10.5 so it is a pump gas deal for my boat. Hoping for 700 and change.

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Post  wickettoby1 November 9th 2021, 11:48 pm

Seems like a pretty reasonable goal, good luck. I treated the dyno session of my 547 as the birth of a child, happy and healthy was the end goal.

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Post  bruno November 10th 2021, 9:32 am

TPayne366 wrote:My 521 with AFR 280s goes on the dyno tomorrow.  The heads have had some work done to them as well as the intake. Running a solid Roller setup with mid 270s at .050 and .730 ish lift. I am running the 4150 manifold with a 1050 4150 style carburetor. Compression ratio is 10.5 so it is a pump gas deal for my boat. Hoping for 700 and change.

sweet build, details and pics of the boat !!

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Post  TPayne366 November 10th 2021, 7:59 pm

I was only able to attend about an hour of the dyno this morning, when I left it was making 717HP @6400 with 650+ ft lbs almost the whole pull. Have not gotten final dyno sheet, but heard final was 737HP @6500 with a super flat torque curve. Will post all build details and dyno sheets when I get them.

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Post  bruno November 11th 2021, 8:54 am

very nice !!

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coming soon x275 build .........
thanks to all my sponsors :

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www.Induction-Solutions.com
www.bfevansraceparts.com
www.ultimateconverter.com
www.keithfulpmotorsports.com
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Post  650jetmech November 12th 2021, 10:02 am

Very similar to my engine. I have a pump gas 521 with AFR 295’s. 11.5:1. AFR Dom intake with an 1150. Solid roller 260/270 .700 lift. It made 760@ 6500 and 660Tq from 4900-5900. It ran the best with 30* total timing. Good luck with yours.

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Post  Batman April 26th 2022, 8:40 am

I have a 521 10.5 comp with afr 315 heads...I run mine round 34 timing...never tried less

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