There are no factory 4-bolt engines and all factory rotating assemblies are cast, but the castings and fasteners are very high quality and can support 400-450hp indefinitely. The block itself can also handle upwards of 750hp with a forged and balanced rotating assembly. Heads are the limiting factor with these motors, even with professional CNC porting none of the stock castings will produce more than about 350hp so you'll need something much better to get big HP numbers.
The 351 Cleveland was available w/4 bolt main (IIRC) but Windsors (351) weren't. The factory crank is nodular cast iron and very stout for a factory casting. Truck rods had spot faced bolts as opposed to broached like car rods. It's been decades since I've messed w/Windsor SB, so someone correct me if I'm wrong on any of this. I will say however, unlike brand-x, Ford short blocks are pretty high quality in stock form and require little to nothing in terms of work or special parts to support moderate HP levels. No need to rely on 4 bolt mains or steel cranks. The 351W never really got the performance treatment...that was focused more on the Cleveland family.
The later 351W blocks were roller cam as well. I heard they were weaker castings but I can't confirm if its true. This sure brings back memories. I need to break out the old books and refresh my memory!
1969 block had a .020 shorter deck height.
The 72-76 blocks I think are the heavier casting ones.
If you are trying to build an engine with mostly factory parts you can bolt Cleveland heads onto the 351w with a little modification. But need aftermarket intake.
The 351 is a great engine and has lots of potential. 427 CID capability, aftermarket has made every and any part for it including 300+cfm heads for it, and with a main cap girdle there is no need for 4bolt mains.
thanks. i am looking to dobuild SN95 in the future since they can be had for next to nothing.
You'll need an aftermarket hood because the intake is too close to firewall a d hits on the rear brace. With the 351w in my 94gt and edelbrock intake, it sticks 1.5" through the hood in the front and hits on the big rear brace on the factory hood. Also my aftermarket mach1 hood has same issue with rear brace.
Back to trucks... Id put a mustang style intake on my truck, because you have better upgrades for tb and intake options.
yeah i'll be tossing the intake for something else. How quick is that stang.
are the pick up engines mass air flow?
As far as I know, none of the 351s were mass air. And it's only a theory about the mass air 460, cause only a few of us have ever seen one in person.
Lots of people convert to mass air, which is fairly easy.
If you use the mustang fox tb bracket then most everything else is bolt on.
I never got a good run at the drag strip with my turbo 5liter, but on paper it ran nearly a 13flat spinning past the 1/8th mile mark with 225 tires.
No nitrous I raced the low 11sec awd talon I built for a customer, and we were neck and neck til 120mph before I started pulling away.
Car was 400whp with 10psi and then I had 150hp nitrous on top of that.
The 351 started as a 400 crank hp engine, but sadly I've never finished the project.
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