351w Power Potential?

wickedmach1 · Feb 16, 2004

Is it possible to make 425 or more HP from a stock '69 351w without stroking it? If so, what combination of parts would you guys use? The car will be used on the street so low end torque will be needed. Thanks.

SadbutTrue · Feb 16, 2004

AFR185/Comp 280H/750 Demon/Weiand Stealth/1 3/4 Headers with full exhaust would probably do it...

rbohm · Feb 16, 2004

pfft, 425hp is fairly easy with a stock stroke 351w. its when you approach the 500hp mark that you start having trouble

wickedmach1 · Feb 16, 2004

What would be your approach if you were to build a 425 + HP standard stroke 351w? Of course money is always an issue but I am willing to do what it takes. Please remeber that the car will be for the street, so I really don't need a high rev (RPM) engine. Thanks for the help.

dolfan87 · Feb 16, 2004

Sad But True gave you a pretty good starting point. I would do all the little friction reducing tricks. Roller cam, standard volume oil pump, roller rockers, electric fuel pump instead of mechanical, ect.ect.

Then I would make sure that bad boy flowed as much air as possible.

That is the best way to make power, and keep it streetable. Build it smart.

87

Route666 · Feb 17, 2004

What do you use to cover the hole where the mechanical fuel pump used to be if you convert to lecky?

Mosse · Feb 17, 2004

"Fuelpump block off plate"

How about, if I may capture part of this thread, what about with stock heads, or cleaned up stock heads?

mp67 · Feb 17, 2004

Mosse said:
"Fuelpump block off plate"

How about, if I may capture part of this thread, what about with stock heads, or cleaned up stock heads?

Usually, to have the work done on stock heads to achieve 425hp potential is the same money as buying a set of aluminum ones and getting a good weight savings to boot. Unless you are skilled to do the work on the stock ones yourself.

milner351 · Feb 17, 2004

I've done some of this and decided to go stroker.
First and foremost, HEADS.
I have twisted wedge, but I wouldn't buy them again because the relocated valves create piston problems with bigger cams.
I'd say for a street engine AFR185 is the way to go.
Also, if going carbureted, make sure you pick an intake that is a dual plane / modified dual plane set up, like the edlebrock rpm air gap for example, or at least a performer rpm.
I'd make sure you balance the combination, and make sure you go with a good harmonic balancer and flywheel / flexplate, and have them balanced with the crank.
USE ARP ROD BOLTS!
Get a desktop dyno program and play around until you find something you like.
You might also talk to the guys at REED cams, tell them your goals, and get their recomendations.

69'Elvira · Feb 17, 2004

wickedmach1 said:
Is it possible to make 425 or more HP from a stock '69 351w without stroking it? If so, what combination of parts would you guys use? The car will be used on the street so low end torque will be needed. Thanks.

It's pretty easy, look at my setup and put comp 280H in it and you have 450hp right in.
My cam is standart, not even mild.

wickedmach1 · Feb 17, 2004

What is the difference between Comp Cams 280H and the XE268H? Are they similiar?

wickedmach1 · Feb 18, 2004

When you guys say to use the Comp Cams 280H, is that for a '69 351w engine? Comp Cams has the retro-fit camshafts for engines that did not come as a roller from the factory. Do I need one of these retro-fits? What parts will I need for the roller conversion? After I do the roller conversion, can I use the 280H? I guess I don't understand the retro=fit camshafts. Please help.

bnickel · Feb 18, 2004

there are a couple ways to do the retro-fit if you go to a roller cam.
1) you can get a reduced base circle cam and use stock roller lifters
2) use a standard cam and get retro fit lifters

the reason you would have do this is because the roller lifter's oiling hole is raised in the bore to compensate for the roller on the end of the lifter, which the OEM's fixed by using a redesigned block with taller lifter bores which is actually the best way to go, but if you go the retro-fit route either will work, but there are drawbacks to both options. with the small base circle cam the diamater of the cam is smaller so it is inherently not as strong as a standard base circle cam. with the retro-fit lifters you could compromise the oiling capability of the engine as the oil holes are not where they should be and i believe you are limited on the lift you can use because you could have a problem exposing the oil hole in the lifter body thereby losing oil pressure to lifter causing it to collapse

Edbert · Feb 19, 2004

I wont claim the "plus" in your 425+ figure. But I should get 420-425 from my stock stroke 351W. Any quality heads with a 2.02/1.61 valve setup should get there with the 278-282 cam that ya'll are mentioning. I am using a mech fuel pump since I am carbed, but I am saving even more power with an electric water pump.

SLIGHTLY_INSANE · Feb 19, 2004

what about throwing the paxton novi 1200 carb kit onto it.

69stanger · Feb 19, 2004

wickedmach1 said:
Is it possible to make 425 or more HP from a stock '69 351w without stroking it? If so, what combination of parts would you guys use? The car will be used on the street so low end torque will be needed. Thanks.

do you mean with stock pistons?

351w Power Potential?

wickedmach1

New Member

SadbutTrue

rbohm

wickedmach1

New Member

dolfan87

Route666

Active Member

Mosse

mp67

milner351

69'Elvira

wickedmach1

New Member

wickedmach1

New Member

bnickel

Edbert

SLIGHTLY_INSANE

69stanger

Similar threads

351w Power Potential?

New Member

New Member

Active Member

New Member

New Member

Similar threads

Privacy & Transparency

Privacy & Transparency