With a bit of luck I'll reach my goal of 500HP.

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Neal
Member #723
[email protected] AIM: MrWesson22

With increases that dramatic, it tneds to make turbulence in the port. Before I lost access to a flow bench, I was just starting to play around with puttying up an intake port. My first attempt showed promise, but then the guy moved and took his flow bench with him.
My numbers were pretty similar, just not quite as good as yours.

lift/ cfm @28"
.200 141.2
.300 202.64
.400 256.28
.500 292.04
.600 306.88
.700 322.56

[This message has been edited by Clevo377 (edited 10-19-2001).]

Paul

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Neal
Member #723
[email protected] AIM: MrWesson22

quote:

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Originally posted by Clevo377:
Well I'm PISSED OFF . Spent two hours getting a reply together, sorted out the pics. Put the whole thing together and it was rejected because I had too many pics. Okay, no problem, I'll take a couple out. WRONG. Lost the f%$#&%g lot . There is now NO reply (sorry Neal). Guess I've learn't to do long replies in Word from now on. But for now F#%$?g

Paul

Maybe tomorrow

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Or put the pics in multiple post. I think the UBB system limits posts to eight images. {I can't change that.}

By the way, you didn't really lose them, if you would have hit the 'Back' icon, the posting window would have returned. Sorry for the hassle.

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC

quote:

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Originally posted by kid vishus:
Unshrouding the back side of the chamber by the intake valve really helps low lift numbers. It might increase the cc's a little, but it really helps the flow.

If I had a digital camera I would take a few pics and send them, but I'm too poor to have one of those new fangled thingeys

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By the back side, I assume you mean the plug or exhaust side of the chamber?

quote:

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Originally posted by Mpcoluv:
By the back side, I assume you mean the plug or exhaust side of the chamber?

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Nope, actually if you use the plug as 12 o'clock, drop down to about 4 o'clock. They take and lay that area of the chamber back with a 40 or 45 degree cutter. It unshrouds that area by the intake valve a bunch. It pulls the chamber back and away slightly from that area of the intake valve.

Still have'nt re-done the reply yet, will do soon.

Firstly, this is only my second attempt at porting. What I?ve done is based on what I have read on the internet, and in a couple of books I have, so I make no claims of knowing exactly what I?m doing. Here goes:

The port floors were welded up to slightly higher than level with the short side radius, then ground down until about level. This was done to reduce the area and thus mathematical peak torque RPM to around 5500. The exhaust crossover was welded up and shaped as per the other exhaust bowls. The port roofs were ground out leading from the start of the port to the bowl. (Bowls were not enlarged at all ) Push rod bumps were removed as much as possible. The inlets neck down slightly to increase velocity leading up to the turn, while the exhaust area stays relatively uniform. The exhaust floor is flat and wide whilst the roof is rounded with the transition from the bowl roof to the port roof smoothed out (ground out the bump caused by the header bolt hole). The short side radii were left as high as possible to turn the flow well above the back of the valve, with the radii smoothed and rounded as much as possible. The guides were shortened and thinned leading in the direction of flow. Bowls were blended only with a minimal of material removed. Seats were blended into the bowls with care being taken to remove the minimum amount of material, thus leaving the slight venturi just above the seat. Chambers were blended into the seats and laid back slightly wherever possible. The heads have cc?d at 59 so removing a little material didn?t hurt (you have to grind out a fair bit to make up 1cc). The exhaust ports and the chambers were then polished. Some Z-spar epoxy was used on the inlets to fill any small inconsistencies in the floor, and blow holes left from the welding.

Paul

[This message has been edited by Clevo377 (edited 10-21-2001).]

I guess one really good thing about the 351C, and it's overly huge ports... is that with enough griding and welding, you can make the ports look about however you want!

Hat's off... that's a LOT of work!

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Neal
Member #723
[email protected] AIM: MrWesson22

With the cylinders, I've only gone 030 over, should I notch them, and if so, how much??