[Mark O'Neal]

A 351W put together with a decent set of heads, a good intake and well matched cam should put out 400 to 425 at the crank. It would be low stress and not a high RPM screamer. Any moderately well matched engine, IMO, should make an easy 1.2-1.25hp/CID on pump gas.

How do you keep the power that low?

 

[Mark O'Neal]

First post here, just getting into 351w’s.
So, my bracket car (83 mustang gt) got laid up after blowing the 3rd engine in 4 years, having my first kid and buying a new house. It’s only been 22 years! I’ve raced everything from escorts to f150’s to 8.90 roadsters over the years. Just retired in July and the kids are gone, I’m getting the gt back out. Have a 460/c6 combo I was going to put in but decided to stick to sportsman for the first year or two.(13.5-20 et) I am NOT running another 8000rpm small block...ever! Want a 5500rpm big block ....but, in the meantime am looking at a 351w/p heads I have as well as a .512/[email protected] cam I have.
So, junkyard 351 with 750dp I have and 1 3/4 long tubes with aforementioned heads/ cam. Guessing 300 hp, that puts me at 110mph and with my 4.86’s, about 6400.
Wild guess, but would the stock bottom end hold that? I’m guessing no but would like a second opinion. It has a 9” out of a 76 bronco and I have a set of 3.50 gears too.
I’m thinking that cam won’t wind the 351 up(still making power) past 6000 so maybe go 3.50’s anyway. How’s that for a first post? Lol!


What rpm will a stock Windsor handle.(repeatedly)

6,400 rpm would be fine.

Cam is too small. Look at a ProMaxx Shocker head if you're on a budget. That head, with a .575ish_235/245ish @ 50 112 LS cam with 10.5:1 compression will make about 575 hp...and you can drive it to 7-11 any time you want.

 

[Mark O'Neal]

Mark, I have a roller cam that I can’t identify, found it out back. It’s .579/.589 or whatever so that would be a [email protected] cam, but that would make too much power(and at too high rpm) I only need 275-300hp max, my concern with rpm was the fact I’m running 4.86’s. Certainly get out of the hole, but would be floating along the back 1/8th Reving but not pulling. Since I’ve decided to switch to 3.50(or 3.55 if I stick the 8.8 back in) this will be low rpm torque engine. If the stock cam noses over around 4600 I’ll probably shift at 45-5000. So, stock cam/heads with 4bbl and headers. 250hp at 4600 will make a good 13.5 et engine. Edit: just checked, 250hp at 3000lbs is 13.3 at 101mph. Run at the top of the class and always be chaser. Now reality and computer programs are different so I’m guessing 13.5-13.7 at 100 or so.

We never ran them over 6,200.....which was the reason we kept the LS at 112. It was our pretty much standard grocery getter combination.

But I get what you're doing.

 

[Mark O'Neal]

We did it with cast cranks for decades.

 

[Mark O'Neal]

...aaand you can have 427ci with the same stroke and no extra expense.

 

[Mark O'Neal]

The RPM limit for the 351W is exactly the same as it is for every engine ever made.

1 rpm before it breaks.

 

[Mark O'Neal]

I'm not one to criticize another man's build but, you'll have one hell of a time getting a few sheets of plywood home in that thing....