408 SBF with AFR’s latest 220 cnc heads – what power?

General engine tech -- Drag Racing to Circle Track

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RevTheory
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Re: 408 SBF with AFR’s latest 220 cnc heads – what power?

Postby RevTheory » Tue Sep 12, 2017 9:51 am

Don't you just love hot-street engines that run that way \:D/

GARY C
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Re: 408 SBF with AFR’s latest 220 cnc heads – what power?

Postby GARY C » Wed Sep 13, 2017 4:04 pm

mbrooks wrote:Update

Have an annoying rear main seal leak so the engine is out and getting a reseal. Only changes from the dyno are Holley 750HP and a Vic Jr intake.

Me and the neighbor had it out the other day and took it for a romp. The road has a pretty new chip and seal so traction was good which helps with the old tires. Made a 3rd gear run and the acceleration was awesome. With the car only weighing 2400# and the pull rod rear suspension the weight transfer is very good. You know the 1G feeling you get and all your innards move to the back, I've had a few cars approach that for a short time, usually at the top of the power band, or when making a turn on a road course. With both of us in the car, from the time I started the acceleration to when I decided things were unsafe that 1G feeling was continuous, I didn't mash the throttle but kept feeding it fuel and it just kept going. I was really surprised. The neighbor is an older gentleman who used to race dirt track motorcycles and probably other odds and ends, he let out a hillbilly holler like he'd won a pot of gold.

That was pretty good acceleration from the bottom of the power band up, didn't hit the rev limiter at 6500 or wherever it is at.

It also has that low rpm rumpity rump, have to be delicate on the throttle in turns, especially with the old tires. Going out making a turn the car hit the rump on the upswing and the car made a nice little 90 degree pirouette, neighbor thought that was pretty cool but totally unintentional on my part.

Lot of motor if it stays together.
Sounds like a ride you need to be careful with. Does the car sit a lot? if so do you think this could be the cause of the seal issue?

Walter R. Malik
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Re: 408 SBF with AFR’s latest 220 cnc heads – what power?

Postby Walter R. Malik » Wed Sep 13, 2017 6:19 pm

Old thread but, maybe this can be useful.
You can all make your own decision here as to how much better those heads are; or should be.

I just got off the dyno 2 hours ago with a 414 Ford Windsor using Edelbrock performer RPM heads but, ported 200 cc intake port volume within the confines of the original casting; about 296/195
10.75/1 compression ratio ... 93 octane Shell premium pump gasoline
Simply port matched Victor Jr. manifold; Quick Fuel 950 carb ... no spacer
Solid flat tappet Cam is 252/256 with .595"/.600" valve lift; 106 separation

Peaks:
537 lb/ft @ 4,800 RPM
586 HP @ 6,600 RPM
http://www.rmcompetition.com
Specialty engine building at its finest.

cjperformance
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Re: 408 SBF with AFR’s latest 220 cnc heads – what power?

Postby cjperformance » Wed Sep 13, 2017 6:42 pm

Walter R. Malik wrote:Old thread but, maybe this can be useful.
You can all make your own decision here as to how much better those heads are; or should be.

I just got off the dyno 2 hours ago with a 414 Ford Windsor using Edelbrock performer RPM heads but, ported 200 cc intake port volume within the confines of the original casting; about 296/195
10.75/1 compression ratio ... 93 octane Shell premium pump gasoline
Simply port matched Victor Jr. manifold; Quick Fuel 950 carb ... no spacer
Solid flat tappet Cam is 252/256 with .595"/.600" valve lift; 106 separation

Peaks:
537 lb/ft @ 4,800 RPM
586 HP @ 6,600 RPM


Thats nice for a fairly basic combo. Ya see people do way more than that to get quite a bit less!
Craig.

David Vizard
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Re: 408 SBF with AFR’s latest 220 cnc heads – what power?

Postby David Vizard » Thu Sep 14, 2017 1:32 pm

Walter R. Malik wrote:Old thread but, maybe this can be useful.
You can all make your own decision here as to how much better those heads are; or should be.

I just got off the dyno 2 hours ago with a 414 Ford Windsor using Edelbrock performer RPM heads but, ported 200 cc intake port volume within the confines of the original casting; about 296/195
10.75/1 compression ratio ... 93 octane Shell premium pump gasoline
Simply port matched Victor Jr. manifold; Quick Fuel 950 carb ... no spacer
Solid flat tappet Cam is 252/256 with .595"/.600" valve lift; 106 separation

Peaks:
537 lb/ft @ 4,800 RPM
586 HP @ 6,600 RPM


Walter --- that's great for a young guy like you -----

DV
David Vizard Small Group Performance Seminars - held about every 4 weeks. My shop or your shop. Contact seminar organizer at marvingvx@gmail.com for details.

mbrooks
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Re: 408 SBF with AFR’s latest 220 cnc heads – what power?

Postby mbrooks » Fri Sep 22, 2017 3:56 pm

Don't think prolonged sitting is reason for seal leaking, or maybe it is. I pulled the engine and reinstalled a 351 FMS engine, I was needing something a little more pleasurable and long distance to drive, able to fill up at any local station. The Vizard engine is on 107 separation, departing from idle with a manual tranny in a lightweight car you don't want to stay just off idle very long.

So now I have this nice looking engine sitting there, wondering what to do with it, and the other car has a more modest 408 with a Daley dry sump..... I never learn.


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