Hello Barry

I hope you don't think that I thought you had no interest.  What I was trying to relay is that to do a one off set of heads would not justify a need for a CNC program which is a logical business decision.   I respect your knowledge and service.  I would like to request if you do have a head with the porting done to one port set I would be very appreciative to be able to use this to get digitized and then return to you.  I don't expect this request to be free and would like to discuss with you the cost of using this sample head.

Thank you

Hello  In response to Blair's comments.  I have been able to determine that this is one of the 352 CID blocks.  Casting number is C4AE-A.  I rough measured the bore using a digital caliper and these measure 4".    Also it does not have the extra webbing on one of the mains.  I have ran the drill bit test between the cylinders and it is right at 14/64's so these are a little thicker than the normal 390 block.  I will be running a sonic test after tear down and magniflux.

Hello all

I have a block as described in my subject line.  I have yet to tear it down but will soon.  Though I will sonic test the bores I was wondering if this block had thicker cylinder walls than the normal 390 block.  My thought is that these blocks were being cast for a 427 bore but did not have enough wall thickness to pass inspection.  I am probably wrong but I would like to know what you experts have to say.  Thank you for your attention to this inquiry.

Hello

I read through your post and noticed that you got parts from a person in Bend Oregon.  I live very close to Bend do you mind if I ask where you live?  I love FEs and want to meet you if you are in agreement.

Phil

Hello to all that originally posted to my inquiry about 58mm weber style carburetors.  I would like to reopen this dialog as now there are a newer design carburetor offered by Empi that is the needed 58mm.  VERY EXPENSIVE but I think these will be worth it.  My main reason to open this again is to ask Jay Brown a few questions about his testing of 48 in his book.  If jay does not mind responding to the following questions
1. Givent the cam size and subsiquent reversion caused by overlap did this condition cause any lower RPM issues at idle and 2500 and below RPM
2. Did you have to revise your fuel pressure to the carbs?
 
To save time and answer an obvious upcoming question why are I not considering stacked fuel injection.  Because I dont want to deal with changing my slip fit headers on my Cobra and contending with revising cam timing to increase idle vacuum. 

Thank you
Phil

To All

than k you for you replies and experience

Allow me to respond to some of your questions

1. Head Gasket type:  I am going to use Cometic head gaskets with a compressed thickness of .027 and a bore of 4.25. 
2. Valve to piston:  The pistons are keith black units they have a 28cc dish and are down bore .018".  Cam timing at .050" is only 214 intake and 222 exhaust.  lift is .585" I & E.  It is an hydraulic roller.  Based on this the valve to piston should be fine but I will check it.
3. the heads I plan to use are C4 units with a 72cc chamber (already measured)
4. The heads will get the intake side milled to allow proper alingnment with the manifold.   
Given the current combination I will be around 8.75:1.  this is too low to make efficient power.  I need to get the compression up to 9.50:1.  So doin the math I
 need to reduce the chambustion chamber by 5-6 cc's.  So I will mill off around .040".

Again thank you for your responses. 
Phil

thanks for the reply's and advice.  I may dyno the engine as I push all the engines I build to be dyno'ed.  Besides the obvious information it also helps to determine the engine is sound and good mechanically.  I love dyno's.  The head options are interesting and I will need to do a review of which would be best for this project now that the costs associated with a parts correct 1967 GT 500 duplicate are just too high for a engine that will not be placed into a car at this time. 

When I finish the engine and if I do dyno run it I will post the results.  I don't expect big power.  Somewhere around 350 to 400. 

This project is going to go on hold as I just bought a 1957 T-bird for a really good price.  It needs the engine redone (312 4-bbl) and all the parts are there.  Hey if you guys know a "Y" block guy that doesn't mind some emails I would really appreciate that contact.