Guess the horsepower 428CJ....

[frnkeore]

I don't know if the 306 Shelby had larger valves but, the HP 271 engine, had only 1.67 intakes, originally.

[plovett]

Who are the winners?

It looks like "fastF67" with 435hp and 307hp, or "1968Galaxie" with 437hp and 309hp, depending on how you want to score it.

Compared to actual results of 435hp and 309hp, I think?

[blykins]

fastF67 looks like the winner.  Can't go over with the guess and 1968Galaxie went over on the 428 guess.

fastF67, shoot me your address via email (brent@lykinsmotorsports.com) and let me know what thickness of stand shims you want.  I'll get those in the mail to you as soon as they arrive.

Good guessing, everyone.

[e philpott]

I don't know if the 306 Shelby had larger valves but, the HP 271 engine, had only 1.67 intakes, originally.

my 289 hipo had 1.78 intakes bone stock , I had 1.90 and 1.6's installed

[1968galaxie]

It was a good guess!
Congrats to fastF67!

Imagine being that close on 2 different build. I guess I am not all that clueless.

Thanks for the details on the two builds Brent.
You are lucky to have the chance to build so many cool engines!

[frnkeore]

I don't know if the 306 Shelby had larger valves but, the HP 271 engine, had only 1.67 intakes, originally.

my 289 hipo had 1.78 intakes bone stock , I had 1.90 and 1.6's installed

Note that I said "originally".  I had three, 5 bolt, 271 HP, factory engines. 64 Fairlane Sports Coupe, 65 1/2, 2+2 and another one, I bought another with 2/4's. Both cars had top loaders and 9" rears. All those 5 bolt engines had 1.67 intakes. They all had the factory, screw in studs, 3/8 rod bolts and the counter weight on the front of the crank.

[fastf67]

I very much appreciate the offer of the shims but will have to pass at this time as I'm in the middle of putting a full frame set-up in my 67 s-code fb and a long way away from needing engine components. Please sell them to someone and advance yourself, family and business to the next level. I would very much like your help in building the 482 I have in mind such as choosing the correct cam and the combo of parts needed when the time comes. I put a high value on the info that you, jay, blair, barry and others have and sure that all will play apart in some way and already have just by reading this forum.

[gt350hr]

   The 289 is a minor surprise. "I" would have thought even the World head would have made more power than the original 289 HP head. Which BTW got the 1.78 intake starting in '64 along with all other 289's. The 'R" model heads ( originally) got port work by Valley Head Service or Mondello's  and 1.875 x 1.625 valves. I still have one set left.

      Nice work Brent , good to see real numbers.
  Randy

[blykins]

310 hp and 320 lb-ft with essentially almost a full point of compression less than the GT350 engine, turning all accessories, doesn't make me feel that bad.  Wasn't Hipo/Shelby cam 228° @ .050" as well? 

All-in-all, the World heads aren't Dart heads, but we were clueless as to when we'd ever get a set of the new Dart heads in stock, and the customer was eager to get his engine down in his 289 Cobra replica.

[Heo]

Yes a surprice. A friend a while ago built a 302 for a 54Ford dont remember what heads
think it was dart or mayby tfs mild hyd cam for a stock converter XE 262H flat tops
weiand stealt intake made 345 with a edelbrock 600 carb started to run fat
on higher rpm would probably
made more wtih a holly 750. but the customer was satisfied and dont wanted
to continue dyno it

[blykins]

Yes a surprice. A friend a while ago built a 302 for a 54Ford dont remember what heads
think it was dart or mayby tfs mild hyd cam for a stock converter XE 262H flat tops
weiand stealt intake made 345 with a edelbrock 600 carb started to run fat
on higher rpm would probably
made more wtih a holly 750. but the customer was satisfied and dont wanted
to continue dyno it

I would consider that a kosher comparison.   Even the difference between a 292ci engine a 306ci engine would be ~15 hp by itself.  If the heads were indeed either Dart or TFS, then either one would be head/shoulders above World Windsor Jr's. 

[Heo]

Yes a surprice. A friend a while ago built a 302 for a 54Ford dont remember what heads
think it was dart or mayby tfs mild hyd cam for a stock converter XE 262H flat tops
weiand stealt intake made 345 with a edelbrock 600 carb started to run fat
on higher rpm would probably
made more wtih a holly 750. but the customer was satisfied and dont wanted
to continue dyno it

I would consider that a kosher comparison.   Even the difference between a 292ci engine a 306ci engine would be ~15 hp by itself.  If the heads were indeed either Dart or TFS, then either one would be head/shoulders above World Windsor Jr's.

Well Brent it was not to criticise you, i was just surprised. The heads he used must be much better. I dont thought it was
that big differece between different aftermarket heads. I must ask what heads he used but he is in Thailand now

[blykins]

Yes a surprice. A friend a while ago built a 302 for a 54Ford dont remember what heads
think it was dart or mayby tfs mild hyd cam for a stock converter XE 262H flat tops
weiand stealt intake made 345 with a edelbrock 600 carb started to run fat
on higher rpm would probably
made more wtih a holly 750. but the customer was satisfied and dont wanted
to continue dyno it

I would consider that a kosher comparison.   Even the difference between a 292ci engine a 306ci engine would be ~15 hp by itself.  If the heads were indeed either Dart or TFS, then either one would be head/shoulders above World Windsor Jr's.

Well Brent it was not to criticise you, i was just surprised. The heads he used must be much better. I dont thought it was
that big differece between different aftermarket heads. I must ask what heads he used but he is in Thailand now

I certainly didn’t take it as a criticism.  Just bench racing here because I’ve never used those heads before and was trying to make comparisons.

I’ve seen flow numbers for them all over the place, from 214cfm at lift to 235.  A 214 cfm head isn’t much over a prepped hipo head. 

[Heo]

I got answer form Thailand  TFS 170 cc CNC ported heads so that is
a bit different. Used those heads beacuse the customer had them
The friend wanted to use much bigger cam and a 750 carbBut customer just wanted a
engine for cruising so thats what he got. Runs real nice in the 54 Ford

[My427stang]

310 hp and 320 lb-ft with essentially almost a full point of compression less than the GT350 engine, turning all accessories, doesn't make me feel that bad.  Wasn't Hipo/Shelby cam 228° @ .050" as well? 

All-in-all, the World heads aren't Dart heads, but we were clueless as to when we'd ever get a set of the new Dart heads in stock, and the customer was eager to get his engine down in his 289 Cobra replica.

I would find it hard to believe that the 289/271 and 289/306 were really that powerful.  All brands were very good at "advertising HP" back then.  My gut says on the same dyno, they'd be much lower, even with the big compression.