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351 Windsor block limitations

Does the 351 Windsor have the same block limitations as the 302 of 600hp? I have never heard anything about the 351 limitations. The girdle must increase the blocks capabilities and limitations, but how much?

I am looking at building a 427 or 408 Clevor that makes close to 650 hp NA and wanted to know if this would be a worry for a stock 96+ roller cam 351 block. I really do not have the funds for a Dart or Boss 351 block and would like to stick to the factory block.

Any thoughts............

351 Windsor block limitations

Reply #1 –
Around 7-750 from what i've heard.

351 Windsor block limitations

Reply #2 –
Mine broke @ 675rear wheel HP  with a single turbo thur an AOD

 It was a 84 model block




SCT Tuned by Me(Greg@SpeedyDyno.com)

E.T. 10.28 @ 136.5 MPH 1/4 mile: List of Mods; 351 EFI, AFR heads,AOD,Rousch 13in frt brakes,11in rear brakes, AirRide Tech air ride system, Sub frame connetors,2400 RPM stall, 3.50,BBK shorties,T62PT Turbos  air to air intercooled, Home built kit.
Car weights 3705lbs without driver:burnout:

351 Windsor block limitations

Reply #3 –
Quote from: 5.8fastcat;304905
Mine broke @ 675rear wheel HP  with a single turbo thur an AOD

 It was a 84 model block


What did you build after that? Dart? Boss? Man-O'-War?

351 Windsor block limitations

Reply #4 –
What a 351 is capable of handling is mostly in the short block...but if you don't have a good tune on it, that'll kill even the best of short blocks quickly.

675@ the wheels through an AOD has gotta be a solid 800+ horsepower at the crank, and I'm sure a like amount of torque.  Sounds like a good set up to me.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

351 Windsor block limitations

Reply #5 –
I went with a Man-O-War 9.5 deck block 4.125 bore.

Just had another  custmer with a S trim on a stock Lightening block  pushing about
 450 RWHP bust the block but could have had a rod break 1st not sure.

 I figure about 25% loss thur an AOD so that would be about 843 @ the crank




SCT Tuned by Me(Greg@SpeedyDyno.com)

E.T. 10.28 @ 136.5 MPH 1/4 mile: List of Mods; 351 EFI, AFR heads,AOD,Rousch 13in frt brakes,11in rear brakes, AirRide Tech air ride system, Sub frame connetors,2400 RPM stall, 3.50,BBK shorties,T62PT Turbos  air to air intercooled, Home built kit.
Car weights 3705lbs without driver:burnout:

351 Windsor block limitations

Reply #6 –
This Clevor combo would be capable of 750ish NA HP at 6800 RPM. I guess that using an aftermarket block to begin with makes the most sense.