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400 hp 302 with stock internals

12K views 20 replies 11 participants last post by  bob442  
#1 ·
Yup. 405 HP at 6,200 RPM and 380 lb-ft of torque at 4,300 RPM.
For a comparison, a stock HO 5.0L puts out 258HP and 315 lb-ft of torque.

This is with a stock HO 302 block, piston's, rods and cam. All that was done was the install of one hell-of-a set of new cylinder heads, rocker arms and exhaust headers. Never seen such a performance gain before with a simple upgrade!

You have to check this out. A 302 can indeed be a screamer of an engine, perfect for a crawler :D

http://www.airflowresearch.com/articles/article087/A-P1.htm
 
#2 · (Edited)
Nice!

They did the same build many years ago in a Pro 5.0 or MM&FF issue.

AFR heads, 1.7 rockers, and a few other bolt ons. They also used the stock camshaft and got 400 horse out of a stock 5.0 longblock. Pretty badass for what little went into it.

I wouldn't push the stock block much over that though, most guys who push further crack blocks right down the middle. FWIW I remember the factory power rating on my old 5.0 at 225, not 250+. It was the torque that got that little car moving quickly.
 
#3 ·
It makes me glad that Ford brought back the BOSS block with the 4 bolt mains. Now there is an engine that can be built!

As for the power numbers, the stock engine was tossed on an engine dyno for those, but with a demon carb and performer RMP intake instead of the FI system. That may make up for the extra ponies there.
 
#15 · (Edited)
X2... At least on the early block... Isnt worth adapting the spider and having to run a small base circle cam...

...But on the Roller block the factory setup is more than adequate for the power levels a stock roller block will handle... 7k is no problem for the factory setup, and above that and your pushing the limits of the roller block.

EDIT: Just so Im clear... Thats bursts of 7k...
 
#16 · (Edited)
Those power numbers with a stock cam are good and all, but with the fresh valve train of the new heads you would be stupid not to upgrade the cam, not saying it has to be crazy big, but a good off the shelf low-mid 500 lift cam designed for tq would do wonders for less than 200 bucks.
 
#19 ·
I think the first thing you would need to do is to swap out the speed density to mass air flow. Not sure but I don’t think the F-150 has the 302 roller motor like was used in the article. You can get the mass air off a 95 or 96.

I’m looking at doing the mass air swap on my 92 nite that has the 351 and adding an S-trim super charger. That should wake it up.
 
#20 ·
You can, but you need to ditch the speed density fuel injection system to either a carburetor, the MAF system from a later 302 or a stand alone FI system. The reason is that speed density systems are not able to handle changes to the engine. All adding exhaust or a better intake system will do is cause the computer to freak out and make your motor run funny.

Really, it seems that this head swap and a decent cam will bring you right into the range your looking for :smokin: