Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

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

Re: 140 CFM Merlin Heads?
Posted by: roverman
Date: October 06, 2010 10:51AM

Thanks Rob. Did they also list "area under the curve" ? Stage I Buick V6 valves ? Peaked at .550" ? roverman.


else
Andrew Elsey

(2 posts)

Registered:
06/24/2013 08:39AM

Main British Car:
Re: 140 CFM Merlin Heads?
Posted by: else
Date: June 24, 2013 09:17AM

Hi Dan,

I have those Vizard heads you pictured on the first page fitted to my 5.2 in my TVR Chimaera. I Bought them from Rob at V8 Developments.

Its been a long term project as I have had to make up a bespoke inlet manifold and induction system and have had some teething problems but we are getting there slowly.

Andy


else
Andrew Elsey

(2 posts)

Registered:
06/24/2013 08:39AM

Main British Car:
Re: 140 CFM Merlin Heads?
Posted by: else
Date: June 24, 2013 12:28PM

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MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: 140 CFM Merlin Heads?
Posted by: MGBV8
Date: June 25, 2013 09:46AM

Very nice!


Moderator
Curtis Jacobson
Portland Oregon
(4577 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: 140 CFM Merlin Heads?
Posted by: Moderator
Date: June 25, 2013 10:53AM

Andrew, we'd love to have your Trevormobile in our photo gallery. Can we get you to submit a How It Was Done worksheet?


slow_M
Bernard Holzberg

(59 posts)

Registered:
07/18/2008 11:12AM

Main British Car:
1975 TVR M series Ford 331

Re: 140 CFM Merlin Heads?
Posted by: slow_M
Date: November 29, 2013 11:31PM

I hope this is the appropriate thread to ask the question:
Have any of you ever had the opportunity to test, or have a look at any of the REPCO heads, or the Oldsmobile Jetfire 6-stud heads? I wonder if the Olds head offers any improvements. The two major variants of REPCO heads, one, a two-valve, the other, a four-valve version certainly should. Supposedly, they were able to support 325HP, and 385HP, respectively, on a 3 liter motor, with a bore and stroke of 3.50" x 2.375".

Best,
B.


roverman
Art Gertz
Winchester, CA.
(3188 posts)

Registered:
04/24/2009 11:02AM

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

Re: 140 CFM Merlin Heads?
Posted by: roverman
Date: December 02, 2013 11:33AM

Bernard and clan, being a collector of Jetfires, this head offers no performance advantage, over, say an Olds h-icomp. head. All 215 Olds heads have a shallow bathtub type chamber, with the valves moved closer to center of bore, than Buick/Rover, semi-hemi.HP quotes for Repco, do sound impressive, but dyno sheets tell a better story. Being Formula 1, I suspect the power band is narrow, and at very high rpm ? Those currently looking for serious, non-boosted hp.might best consider the bare TA heads, for potential flow vs $'s. NOT an indorsement. Cheers, roverman.

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