Having built a couple of blown street motors, I think you're right to worry about the head gaskets as that was a problem on my first one.  I picked up oil thru the PCV valve, and the detonation blew the gasket instantly on the dyno.  I used ARP studs on the second motor, and repulled them about 7 times before I got no more movement.  I was pretty worried about that, but J Mummert told me that wasn't unusual.  Both motors have boost retard with the MSD, but as street cars I can't depend on the fuel, and don't reset the timing for ambient temperature, so I really want to aviod detonation.  When I bought the cams from Mummert (one custom 274 he had, and a 284) he had some interesting thoughts on the effects of lobe centers and the rpm that the boost levels occur at.  Turbos and centrifigals tend to make boost at higher levels than roots set ups, and Mummert was more likely to go with n/a lobe centers than what you might see advertised as "blower cams".  It would be worth talking to him about that, he's very knowledgable.  Aero Motive makes a couple of regulators that will reference fuel pressure to boost, just get the carb model, not the fuelie one.  Summit
Racing has them.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

There is a set of 471s on ebay right now:

471-heads

I was going to ask some questions and bid on them but it sounds like you can put them to use sooner than I.


Lawrenceville, GA

Thanks, Ted...I was speaking with John Gambill and Pat Fleischman about heads, and they told me about the 471s, which is probably what I will use.  I am currently working on getting a set of those, so, at least that part of the combo will be had..

Thanks for the info and links on the headbolts, etc.  I will have the info printed and in my binder tonight. 

James Potter
`57 Fords International



`57 Custom Tudor

`57 Fords International National Director

Pass Christian, MS (near Gulfport/Biloxi)

When boosting an engine, be sure to use ‘posted’ heads.  These have the extra support built into them so the decks of the heads will not flex under pressure.  Only a small percentage of the G heads were posted while all the 113 and all other heads cast starting in 1958 are posted.  As Glen mentioned, using 471 heads or re-valving some of the other 82+ cc smaller valve head castings would make for a better starting point as far as compression ratio goes.

 

Here’s a link showing how to identify posted heads.

http://www.y-blocksforever.com/forums/Topic6711-3-1.aspx

More information on posted heads can be found by simply putting ‘posted heads’ in the search bar.

 

Blower cams have been talked about in detail on the site so a search should yield some of these discussions.  Here are some of the links on the subject.

http://www.y-blocksforever.com/forums/Topic8997-3-1.aspx

http://www.y-blocksforever.com/forums/Topic8191-3-1.aspx

http://www.y-blocksforever.com/forums/Topic3108-3-1.aspx

 

I’ll add to John’s ½” head bolt discussion in that I’ve experimented with up to 130 lbs of torque using ARP bolts with oil.  No issues with the threads with this much torque and this was the torque actually recommended by ARP for their hardware when using oil on the threads.   For my roadster engine with 13.0:1 CR, I’m currently torquing the ARP ½” bolts to 105 lbs on the top row and 100 lbs on the lowers with oil on the threads.  Fe bolts are the right diameter but not all the correct lengths.

Lorena, Texas (South of Waco)

Just take your time... We started planning (drunk as hell ) our combo in 2003. First with 239 with twins, but finally in 2007 ended up with 292 and twins. Well thought, half done... Take a lot's of photos and keep us informed.

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

Thanks, John, that's just what I needed to know.  14 psi is about what I was looking to make, dont want to get too greedy, you know?  Hopefully I can get up to Glen's place in the next week or so, and get the 292 block.  It's starting to come together, at least in my mind, lol

James Potter
`57 Fords International



`57 Custom Tudor

`57 Fords International National Director

Pass Christian, MS (near Gulfport/Biloxi)

James:

I tap the head bolt holes to 1/2-13.  Don't drill them first, just let the tap take out the old threads.  Start with a starter tap, then finish with a bottom tap.  I use a junk head with the bolt holes drilled to 1/2" for a tap guide.  If you don't have a junk head, drill one of your intended for use heads to 1/2" for a tap guide, you will need to drill them to 17/32 for the 1/2" bolts to clear, so you won't hurt one to use it for a guide.  I go to the local Fastenal store and buy ten 1/2-13 x 2 for the lower row, six 1/2-13 x 4 for the shorter long bolts, and four 1/2-13 x 4 1/4 for the longer long bolts.  All grade 8.  I torque them to 85# on the top row and 80# on the bottom row.  Retorque after several warm up/cool downs.  You may need to find a thinwall 3/4" socket to fit the larger bolt heads and clear the counterbores.  1/2" studs would probably be even better, but I have had good luck with these and 14# boost at the top of each gear.

John

John

John - "The Hoosier Hurricane"

Hollow Head, I have been reading on your combo.  That ought to be one scary ride with such a light weight. 

Glenn, the head gasket issue is at the front of my thoughts .  I was wondering if it were necessary to go to o-rings..There is a machine shop here that can do it, just another cost to add to the pile I guess. 

Tell me more about the FE head bolts.  If there is enough meat in the block to go to the bigger bolts, and the lengths are useable, one could also go to ARP head studs for an FE, right?  That sounds good to me..Any ideas there Ted or Jerry?

James Potter
`57 Fords International



`57 Custom Tudor

`57 Fords International National Director

Pass Christian, MS (near Gulfport/Biloxi)

And Speedmaven, Alan Allards great book about turbogharging & supercharging states that 10-25 psi boost pressures give you about 250 hp per litre, so 292 should give you over 1000 hp if all the parts will stand that. 7-15 psi gives you 40 -50% increase in power .

 Seppo from Järvenpää, Finland
www.hollowheads.net (just click the hole in the head to proceed)

I don't have any experience with a boosted engine, but from what I have read on this site and other sources, the biggest problem with high boost will be keeping head gaskets in it. I think that Jerry Christinson had to go to copper O rings with his "Blackbird" engine. I think Ted and John may have gone with the larger FE head bolts.

Glen Henderson



Freedom is not Free

Letohatchee, AL