Thread: ford 521ci conversion kit?

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Has anyone fitted a 521ci conversion kit from eagle?
what i want to know is it any good?
steel crank/h beam rods etc, is it ok with 2 bolt standard mains,or should i convert to 4 bolt with a kit, compression with eagle kit at 10.1.
Is a bottom end stud girdle kit a good idea? or does it cause more problems,will it fit inside a milodon deep sump?
Planning on buying,but wish to know of any problems,needs to be internally balanced?

i have done the 512 with cast steel crank and h beam rods srp pistons and a 545 14to1 scat steel crank h beam rods srp piston with Nos two bolt block old 429 block still holding good with many hard runs . i told them that i would of like to go to 4 bolt main but so far so good they run it in a jeep in the mud they call it hill and hole racing ? so far not to may things can keep up to it for the money there doing very good . i am a dealer for pbm so i build my kits with the part i want to use . far as going internal i think the 4.500 did go that way .the other 429 did with the smaller crank .both were very EZ to build i would not wast much time with the 4 bolt main if just 10to1 with no power adder s has for the girdle you could ask who sell s the girdle and ask milodon the ford has a very wide pan rail should not be to bad for room for a girdle

No need for the girdle at all on a bbf. Their are guys over on the www.460ford.com website making close to 900 hp on stock 2 bolt blocks at over 8,000 rpm's in pulling trucks.


A bbf will clear a 4.5" crank which makes you a 554 ci at .060 over and a 557 ci engine at .080 over. That is with no grinding at all.

Their website showes all stroker cranks to be internal balance, and yes they are a good kit.

Thanks guys,i'll continue to look at it.

I have used the 521 Hawks Kit in my Jetboat motor.Had Hawks rods and crank, and Probe pistons Has been a good motor.Been in there for 3yrs and lots of Hrd passes Since it's the only ford motor I have would have did some oiling improvements on the block If I would have know about earlier.Some deburr work and drilling that extra small hole for the dizzy oiling.