Healey Sports Cars

mods & upgrades for Healey (Nash, Austin, or Jensen) cars, including engine swaps

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stuntflyr
Chris McMillin

(5 posts)

Registered:
12/30/2015 01:37AM

Main British Car:
1957 Healey Jamaican Chevy 327

327 Healey Jamaican headers question
Posted by: stuntflyr
Date: January 13, 2017 02:20AM

Anyone make up a set of headers INSIDE the frame rails on a Chevy Healey? Mine has a iron exhaust manifold set up that probably isn't too free flowing.
Chris...
FF Ohio Jamaican 327 rt.jpg


HealeyRick
Rick Neville

(443 posts)

Registered:
12/19/2007 05:01PM

Main British Car:
1963 Austin-Healey 3000 Ford 5.0L

authors avatar
Re: 327 Healey Jamaican headers question
Posted by: HealeyRick
Date: January 15, 2017 12:17PM

If you're already running ramshorn manifolds, you may not see a lot of gain switching to headers. Google ramshorn vs. headers to see what I mean. Speedway sells their own cast iron manifolds they say equal tube types: [www.speedwaymotors.com] might be a lot easier than trying to figure out a new system.


stuntflyr
Chris McMillin

(5 posts)

Registered:
12/30/2015 01:37AM

Main British Car:
1957 Healey Jamaican Chevy 327

Re: 327 Healey Jamaican headers question
Posted by: stuntflyr
Date: January 16, 2017 01:44AM

Thanks Rick, good reading.
Yes, it has factory rams horn iron manifolds. For my level of power it'll be fine for a while. I sure have very little room for headers on the Chevy. Do you not have a little more room with the Ford? How are you thinking of working out your exhaust?
Chris...


HealeyRick
Rick Neville

(443 posts)

Registered:
12/19/2007 05:01PM

Main British Car:
1963 Austin-Healey 3000 Ford 5.0L

authors avatar
Re: 327 Healey Jamaican headers question
Posted by: HealeyRick
Date: January 16, 2017 12:04PM

Hi Chris,

My issue is my motor dynoed at 345 hp at the crank and with no other changes 199 at the wheels. Even taking into account parasitic losses of 20%, I should be seeing another 75 - 80 hp at the wheels. The only way I can see losing that power is through the Sunbeam Tiger cast iron manifolds and my exhaust that has a few 90 degree bends. I found a pair of block hugger headers at Summit that look like they might work. In the spring, I'll pull my engine and see what footwell clearance I'll need to make in order to try and fit the headers. I'll let you know how it goes.


stuntflyr
Chris McMillin

(5 posts)

Registered:
12/30/2015 01:37AM

Main British Car:
1957 Healey Jamaican Chevy 327

Re: 327 Healey Jamaican headers question
Posted by: stuntflyr
Date: January 16, 2017 01:47PM

Wow, that's a lot of work but can see it would be worth it for a gain of that much power! Still no heat in the garage?
Chris...


HealeyRick
Rick Neville

(443 posts)

Registered:
12/19/2007 05:01PM

Main British Car:
1963 Austin-Healey 3000 Ford 5.0L

authors avatar
Re: 327 Healey Jamaican headers question
Posted by: HealeyRick
Date: January 17, 2017 10:06AM

I can either pay to put heat in the garage or spend some time in Hawaii. Aloha!


roverman
Art Gertz
Winchester, CA.
(2860 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: 327 Healey Jamaican headers question
Posted by: roverman
Date: January 17, 2017 02:09PM

Cadlallac heaters are cheap now....



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