351 block strength in stroked s/c appl.

gon4x4n · 02-15-2001, 03:57 PM

Is there anyone that can comment on if a production 351 block with a main support is stong enough and reliable in a 14lb of boost 383 stroker application?

I do have a line on a A351 block but they want a premium for it.

Any thoughts would be appreciated since I need to start build up next week.

------------------
Prerunner F150 with 92' Mustang 302, Aftercooled Vortech S-Trim with 2.75 10 rib pulley set, Maxflow bypass,
Vortech Fuel Rails, Cartech inline Pump with #8in and #6out feeding 36lb injectors, Powerflex 4" inlet tube
Edelbrock Aluminum Heads(2.02/1.60), HIFLO waterpump, 70mmTB, Performer intake, MSD 6ALBTM,
Doug Thorley Tri-Y Long tubes to single DynoMax Race Magnum, C6 with 2600 Stall 4.10s with Lockers,
engine relocated 14.5" rearward!!

84_GT350 · 02-15-2001, 04:13 PM

A 351 block should be plenty strong for that with a main girdle. And hell, if you can get an A351 block, do it. Yeah, it might be expensive, but it'll hold up better than a production block in any case.

------------------
1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

Brcuda · 02-16-2001, 09:31 AM

It will hold up if you keep the rpms down, But, why would you want to build a motor with that kind of power with a weak foundation. A least get a sportsman block. Even with the sportsman block the rpms should stay under 6500 girdle or not.

------------------
Kenne Bell supercharged stang 93LX (the perfect sleeper) Named Wheezer 11.901@117.40 on BFGs/w 1.71 60's

DirtKing · 02-16-2001, 03:05 PM

I think you get 2.75 main journals with the A block(I might be wrong)..that will really help reduce your bearing speed. I'd say it's better to spend the money up front. By the time you spend the money on the main support and machine work you'll be pretty close anyway.

------------------
88LX notch, Speedpro EFI Procharged!

macx · 02-17-2001, 01:34 PM

Id check out that Sportsman block. check www.oemfordparts.com for info & decent prices. I think I have an article on the Sportsman, send me your email if you'd like it (if I'm not dreaming)

02-15-2001, 03:57 PM	#1
gon4x4n Registered Member Join Date: Nov 2000 Location: Zeeland,Mi,USA Posts: 16	351 block strength in stroked s/c appl. Is there anyone that can comment on if a production 351 block with a main support is stong enough and reliable in a 14lb of boost 383 stroker application? I do have a line on a A351 block but they want a premium for it. Any thoughts would be appreciated since I need to start build up next week. ------------------ Prerunner F150 with 92' Mustang 302, Aftercooled Vortech S-Trim with 2.75 10 rib pulley set, Maxflow bypass, Vortech Fuel Rails, Cartech inline Pump with #8in and #6out feeding 36lb injectors, Powerflex 4" inlet tube Edelbrock Aluminum Heads(2.02/1.60), HIFLO waterpump, 70mmTB, Performer intake, MSD 6ALBTM, Doug Thorley Tri-Y Long tubes to single DynoMax Race Magnum, C6 with 2600 Stall 4.10s with Lockers, engine relocated 14.5" rearward!!

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02-15-2001, 04:13 PM	#2
84_GT350 Registered Member Join Date: Apr 1999 Location: Overland Park, KS, USA Posts: 1,631	A 351 block should be plenty strong for that with a main girdle. And hell, if you can get an A351 block, do it. Yeah, it might be expensive, but it'll hold up better than a production block in any case. ------------------ 1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

02-16-2001, 09:31 AM	#3
Brcuda Registered Member Join Date: Feb 1999 Location: St. Louis,Mo. USA Posts: 37	It will hold up if you keep the rpms down, But, why would you want to build a motor with that kind of power with a weak foundation. A least get a sportsman block. Even with the sportsman block the rpms should stay under 6500 girdle or not. ------------------ Kenne Bell supercharged stang 93LX (the perfect sleeper) Named Wheezer 11.901@117.40 on BFGs/w 1.71 60's

02-16-2001, 03:05 PM	#4
DirtKing Registered Member Join Date: Feb 1999 Location: brooklyn center,mn,USA Posts: 169	I think you get 2.75 main journals with the A block(I might be wrong)..that will really help reduce your bearing speed. I'd say it's better to spend the money up front. By the time you spend the money on the main support and machine work you'll be pretty close anyway. ------------------ 88LX notch, Speedpro EFI Procharged!

02-17-2001, 01:34 PM	#5
macx Registered Member Join Date: Oct 1999 Location: Gordonville MO USA Posts: 448	Id check out that Sportsman block. check www.oemfordparts.com for info & decent prices. I think I have an article on the Sportsman, send me your email if you'd like it (if I'm not dreaming)