427 Side-oiler - approx. horsepower?

[CCX 33239]

That's the same thing I recall too Pat.

[Gunner]

How shocking: a TV show going for glam and wow instead of facts!

[cobred]

A friend has a 427 side oiler in his cobra. The engine was built by Danbery (builds engines for E.R.A. ) 10 - 1 comp. edelbrock heads, blue thunder intake, and a 540 lift solid cam. Engine made 430 h.p. on the engine dyno. Then he put it in his cobra and only added Erson roller rockers and it made 403 h.p. on a chassis dyno with a little tuning. Either the engine dyno seems a little low or the chassis dyno seems a little high but the car is a beast.

[Gunner]

Danbury's numbers seem... conservative. Which is proper, I think.

Roller rockers with a higher ratio, even a bit, would add 40-50HP, easily.

[patrickt]

Originally Posted by Gunner

Roller rockers with a higher ratio, even a bit, would add 40-50HP, easily.

Erson's are 1.76 -- I guess it's possible that he had 1.73's in there. If he had a lift at the lobe of, say, .306 the difference at the valve is only .010 by moving up the RA ratio -- but the Erson's are awfully nice. I have them on my engine, in fact.

[elmariachi]

So all other things being equal, what affect do you think adding two 4-barrels in place of a single 750 would have on the same 450 HP side oiler?

[patrickt]

Originally Posted by elmariachi

So all other things being equal, what affect do you think adding two 4-barrels in place of a single 750 would have on the same 450 HP side oiler?

Two four barrels will give you more horsepower, but you lose the benefit of the center hung floats. You also lose the beautiful Turkey Pan.

[lineslinger]

Originally Posted by patrickt

Two four barrels will give you more horsepower, but you lose the benefit of the center hung floats. You also lose the beautiful Turkey Pan.

All a twin set of 750's does is try to rev higher, the pursuit was horsepower. It worked. I'll take the juice over the aesthetics.

[Gunner]

Originally Posted by lineslinger

All a twin set of 750's does is try to rev higher.

Um, don't you typically use a pair of 450s?

[Ibr8k4vetts]

Originally Posted by Gunner

Um, don't you typically use a pair of 450s?

I believe bk/bj are 550's.

[vector1]

well just to verify and vilify, you all got me thinking, and i plugged numbers into eap.

using stock stroke & bore (not likely), the small edelbrock al performer heads (there is a larger size), stock dual plane intake with engine heat, crane cam that specified 10-1 compression, 10.5-1 compression, peak tq was 474 at 4500, peak hp was 467 at 5500. this is conservative.

larger edelbrock head showed 483/472 with no other changes,

stock 428 cj head showed 462/450 with no other changes,

large valve 302 boss heads showed less power yet.

and jeez man, this is the 429/460 forum. if you had one of those you'd be making a ton of power! hah, take that all you fe-aphiles.

[elmariachi]

Originally Posted by patrickt

Two four barrels will give you more horsepower, but you lose the benefit of the center hung floats.

There are no curves in south Texas so I can handle that.

Originally Posted by patrickt

You also lose the beautiful Turkey Pan.

Didn't have one yet anyway.

Originally Posted by vector1

peak tq was 474 at 4500, peak hp was 467 at 5500. this is conservative.

I have a fresh 427 SO, 4.250 bore, 9.8:1 compression, Comp 294S flat tappet (.605 lift), a set of new-out-of-the-box unworked medium riser heads, Erson roller rockers, Le Mans rotating assembly, Sidewinder intake and a 750 Mighty Demon and it made 451HP and 482 ft lbs of torque at the flywheel on a bonafide NHRA engine dyno. Plug that into your eap and tell me what it says. The software will claim much more.

[vector1]

Originally Posted by elmariachi

There are no curves in south Texas so I can handle that.



Didn't have one yet anyway.



I have a fresh 427 SO, 4.250 bore, 9.8:1 compression, Comp 294S flat tappet (.605 lift), a set of new-out-of-the-box unworked medium riser heads, Erson roller rockers, Le Mans rotating assembly, Sidewinder intake and a 750 Mighty Demon and it made 451HP and 482 ft lbs of torque at the flywheel on a bonafide NHRA engine dyno. Plug that into your eap and tell me what it says. The software will claim much more.

these are the same specs the other guy has engine-wise, he has more compression, i used the same cam, same intake, same carb. looks like your numbers are inflated. i'll take the newer edelbrock aluminum heads over your unworked medium riser heads anyday.

[Ibr8k4vetts]

Someone on FE.com not to long ago built stock 427 and dyno it and I believe it was in the 460 to 470hp range.

[Ibr8k4vetts]

Anthony,
Can you tell me what cam you went with? Thank you.
ps was it hyd or solid?

[Anthony]

Originally Posted by Ibr8k4vetts

Anthony,
Can you tell me what cam you went with? Thank you.
ps was it hyd or solid?

Comp Cams # 33-000-9 Grind 6874F / 4875F SR110 ( solid roller )
Lift Intake .670 Exhaust .677
Duration @ .050 Int 242 Ex 248

[Gunner]

Originally Posted by Anthony

Comp Cams # 33-000-9 Grind 6874F / 4875F SR110 ( solid roller )

*sigh*. Now list all the CSX3xxx cars that had roller cams...

[Anthony]

Originally Posted by Gunner

*sigh*. Now list all the CSX3xxx cars that had roller cams...

Duh.

The point is that if my engine made 550+ Hp with a roller cam, I bet a solid flat tappet would be about 30-40 HP less, still at the 500 hp level.

[RodKnock]

Originally Posted by Gunner

*sigh*. Now list all the CSX3xxx cars that had roller cams...

Good stuff, I had a nice laugh late at night.

You gotta love pure unadulterated speculation.

[lineslinger]

I would venture to say you could boil the tires with that configuration...but please, don't let me put a crimp in opinon's...there is always good information to be considered.