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Author
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Topic: 351 2v heads
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Mach won
Gearhead Posts: 106
From: Walnut Grove, Ca. USA
Registered: Nov 2004
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posted 11-28-2004 03:52 AM
   
How much horsepower are unported 2v heads capable of making? I'm sure it comes to a point of dimishing returns by going overboard on other areas of the motor (compression, cam, carb, etc.). But if everything else is done right what's the best that can be expected? And at what RPM do these heads reach their maximum flow?
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Dad Vishus
Gearhead Posts: 856
From: Moscow, Iowa, USA
Registered: Dec 2001
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posted 11-28-2004 09:35 AM
If you are thinking of building a Windsor block motor, you are probably better off with a decent set of aftermarket Windsor heads.The cost would be about the same since a custom type intake and water passage setup are required for the swap. Depending on what body you are using, headers could be a costly item also. Cleveland heads are heavier, too. A 2V Cleveland could make 350 - 400 HP I would think fairly easily, but after that the oiling system becomes an issue. The main thing would be keeping the RPM a reasonable number. KV could give you more specifics as to cam, etc. ------------------
63 Falcon 377 Cleveland stroker Flying Toilet alchohol injection. 6.19 @ 110 MPH 1/8 mile
2002 Ranger FX4 daily driver
2000 F350 PSD Crew cab dually - Like commuting in a B52!!
98 US Cargo Phantom II 28'
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Mach won
Gearhead Posts: 106
From: Walnut Grove, Ca. USA
Registered: Nov 2004
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posted 11-28-2004 11:06 AM
It's a Cleveland.
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kid vishus
Gearhead Posts: 6220
From: middle of NC
Registered: Oct 2000
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posted 11-28-2004 11:22 AM
I would try and keep unported 2v heads under 7k rpm. I had one motor in the racecar that had unported 2v heads on it, and it ran 10.80's on alchy. I was spinning it higher than that, but that was due to gear and convertor selection.They just dont flow real well. Even ported, they still dont flow great numbers. The short turn is so low, and the port floor is also so low, you can't even get decent velocity like everyone thinks the small port should. The angle of the entry into the bowl area is too sharp. They just aren't a great performance head. An unported 4v head will make more power than a well ported 2v head.Regardless of which heads you use, the stock valves are junk and need replaced. And if the valves are coming out, there is no reason NOT to at least clean up the bowl area before re-assembling the heads. [This message has been edited by kid vishus (edited 11-28-2004).]
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Mach won
Gearhead Posts: 106
From: Walnut Grove, Ca. USA
Registered: Nov 2004
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posted 11-28-2004 01:44 PM
Does anyone know if the New Edelbrock 2v heads are worth waiting for?
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kid vishus
Gearhead Posts: 6220
From: middle of NC
Registered: Oct 2000
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posted 11-28-2004 01:47 PM
I don't think so, but that's just my opinion.
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n2oMike
Gearhead Posts: 2499
From: Spencer, WV
Registered: Jan 2001
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posted 11-28-2004 06:13 PM
If you are looking for an all out race head for use with a 6000 rpm converter, the Edelbrock head is probably not what you are looking for. The factory 4 barrel heads, Blue Thunder, or NASCAR are more up your alley.If you're looking for a head to make great power from 2500-6500 rpm, it's probably just right. The airgap intake should also be a good piece for this rpm range. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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kid vishus
Gearhead Posts: 6220
From: middle of NC
Registered: Oct 2000
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posted 11-28-2004 06:35 PM
quote:
Originally posted by n2oMike:
If you're looking for a head to make great power from 2500-6500 rpm, it's probably just right. The airgap intake should also be a good piece for this rpm range.Good Luck!
More of my opinion here, the only benefits I can see from the pics of those heads are; they are aluminum, and they have nice combustion chambers. They still essentially have the same poor port as the factory iron heads. I really don't see any gain with them over ported iron heads, other than weight and the better combustion chamber. I think there is a reason there are no flow numbers for them as of yet, and I beleive it is because Edelbrock is still trying to get them respectable. But like I said, that's just my opinion. And I do know this, if I was buying aftermarket aluminum heads, it sure wouldn't be for a 30+ yr old block that has a poor oiling system and terribly thin cylinder walls.
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n2oMike
Gearhead Posts: 2499
From: Spencer, WV
Registered: Jan 2001
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posted 11-28-2004 08:07 PM
I can't really say for sure what they or the intake are going to be like. Edelbrock may have addressed things a bit. All I know, is that if I were starting to plan a street/strip 351C build and was looking at buying new valves, keepers etc, and needed to have all the machine work done to convert to an adjustable valve train, rebuild, etc.... I'd probably at least wait and see what the new part were actually going to be like. (if you're not in a huge hurry, and they come out on schedule) They should at least be worth checking out.As for racing, KV has a major point about being able to make more than enough power with the stock 4V heads. The Edelbrocks seem to be geared towards the street/strip crowd. Good Luck! ------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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Mach won
Gearhead Posts: 106
From: Walnut Grove, Ca. USA
Registered: Nov 2004
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posted 11-28-2004 08:32 PM
The motor is already built and running. I just regret going all through the motor without porting the heads. At this point I'm just wondering what would be the best bang for the buck. This is only a street car, but it still bothers me that I could be missing some performance because of the heads.
650 Mighty Demon
Performer intake (soon to be Xcelerator)
Comp Cams 292h
Double roller timing chain
MSD 6AL box
MSD pro Billet Dist.
MSD coil
9.5 comp.
Ford Racing rollers rocker arms.
Full length headers w/X-pipe, 2.5 exhaust
ARP bolts
Tremec 3550 5-speed
3.89 posi.
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