just wondering what kinda numbers people have gotten out of a factory block wether it be stroked or what not. dont really want ya to spill all your secerts to hp but kinda stuff like if it is stroked factory heads aftermarket heads kinda stuff would help

Welp, a Stock Block 347 made 600hp...

How can you compare a 302 based engine to a Windsor? The engine blocks have many differences, and besides, that kind of H.P. out of a 347 is not very reliable, because it is going to need RPM to get there. RPM kills, H.P. does not.

General rule of thumb for a 351W production block is 650-700 H.P. Some say more, some say less. Lot's of variables here as well. Fuel type, forced induction, nitrous, etc... Tune is KEY. Early model block had thicker webbing which helps.

One of my favorite combinations for these motors are the 4" stroke and 6.250" rod for 408 inches on .030" over bore. That is the route I was going to take before I stepped up to the big block.

AFR heads seem to be the hot ticket for these motors.

I'll post links in the AM..

You might just be surprised....

dragogt said:

I'll post links in the AM..

You might just be surprised....

Click to expand...

Here we gooooo.

I've heard of even more power being pushed out of those baby engines. I don't like building grenades.

My 408 stroker was getting around 500 out of it and would rev 7000 rpm no problem. It was just a stock block from a 70's van.

its gonna be a drag motor with pump gas naturally aspirated

general terms pre 74 i say 700 in something pump gas and no forced induction

post 74 i feel like 600 is a safe number

is there somewhere on the net to find out stuff about my block by entering the block casting numbers? its in a 77 f100 but it is not the original and the guy said it came out of a police issued mustang in the 80's somewhere.

Ok so I'm a little late but here..

http://sbftech.com/index.php/topic,28920.30.html

Post #'s 25 & 36

jayh said:

really not much experience being voiced in this thread* :drink

old combo. 8yrs ago
stock block 408
super vic
plain jane 750dp with choke horn milled off and a few backyard tricks
ootb afr 205's
custom solid roller- streetable grind not real crazy
1 3/4 longtubes

made 450rwhp went 10.5@130 at 3200lbs. converter setup for spray, only turning about 6600 through the traps on motor. went 9.2 @149 on with a big hit

car made 445rwhp with 2 1/2 exhaust. 1 7/8 header didnt show any improvement at all, track or dyno. you can cry foul and preach about valve timing but it is what it is

OP's setup could tickle 9's in the right hands

Click to expand...

woody said:

Here ya go, a box of junk

408
12:1
TFS 170 Out of the Box Heads
TFS Stg 3 cam
5 Spd
Fox body 3100lbs
Vic Jr untouched
850

10.90's first time off the trailer, dont know the hp number, dont care

Good Day *:naughty:

Click to expand...

http://sbftech.com/index.php/topic,7864.0.html

http://sbftech.com/index.php/topic,5950.0.html

loudandlifted said:

is there somewhere on the net to find out stuff about my block by entering the block casting numbers? its in a 77 f100 but it is not the original and the guy said it came out of a police issued mustang in the 80's somewhere.

Click to expand...

http://www.mustangtek.com/FordDecode.html

that decoder site is awesome