Power differences, stock to dual carb and exhaust set-up

[greg g]

If you wanna run premium.... apparently .090 is OK for regular.

[Normspeed]

Just wondering, when you shave close to 1/10 of an inch off a stock head, aren't you restricting the intake and exhaust flow, since the valve chambers are part of the head?

[greg g]

Guess that's why some people relieve the block, to restablish the intake/exhaust to the valves.

[Normspeed]

When you relieve the block, what is involved? Are you machining grooves into the block to mirror the intake/exhaust passages in the head?

[blueskies]

Guess that's why some people relieve the block, to restablish the intake/exhaust to the valves.

If you relieve the block to get back what you shaved off the head, aren't you back to where you started?

My EDGY head is 9:1 on the 230 with stock pistons, but I run 91 octane...

Pete

[Guest rockabillybassman]

DONT relieve the block! Not necessary on our blocks because the valves are not shrouded like they are on a flathead Ford V8 where relieving is quite beneficial. Mill the head, leave the ports and valve area alone, except for maybe a 3 angle seat grind. Otherwise you're doing a LOT of work for no gain. The only time porting etc is going to be beneficial is a: in an engine turning higher revs than ours do, or b: in an engine with poor port design, such as the aforementioned Ford.

The advantages of a fancy aluminium head over a milled stocker are minimal unless you're building an engine to run at high revs. Then the shape of the combustion chamber and the squench area comes into play. Otherwise, they just look super cool! Which of course is a perfectly good reason to have one. Blueskies' motor is the prettiest one you'll ever see with it's Edgy head.

[greg g]

That's what I thougt, so maybe a little less of the top yeilds as much as a lot of mill, and then relieveing. Here is what it looks like on a furd flatty.

[Normspeed]

Justin, there are usually local shops that will regrind your cam. My machine shop farmed that to a local cam grinder. There's a fresh thread on cam profiles, some good info to take to your cam grinder.

I have been thinking of a beefier cam as well when I build my Industrial motor. Is Edgy the only cam maker for these motors or is there other options?

[Don Coatney]

I observed this relieved block on my last visit to George Asche. I fully do not understand how this could do any good on a flathead 6 engine. Any gain in flow would be lost in volume.

[Reg Evans]

If you relieve the block to get back what you shaved off the head, aren't you back to where you started?

My EDGY head is 9:1 on the 230 with stock pistons, but I run 91 octane...

Pete

I had the same question.

[Plymouthy Adams]

Increase in flow is the isue here..and more than made up for the .2 -.3 CR loss...also be it know that this is an attemp to mimick the later production flathead ford engines out of france...and france is always with a little "f" by the way. These french block were cast in the later years by who..anyone...Bueller...yes good ole Mopar cast all the latest ford flathead 8's and they did the relieving at the factory...

[David Muma]

anyone know the combustion chamber cc on a stock mopar flathead?

[48mirage]

I installed a Holley 94 from a '56 ford on my D30. That and the dual outlet exhaust manifold with glass packs made a bucket full of difference to me. Quicker to accelerate from idle and better mileage than the single barrel stromberg and single exhaust.