View Full Version : My HP 300-6 Build

11-08-2008, 02:37 AM
Hey all, been a while since ive posted any progress on my ol 78' Stepside. Ive built the motor and putting it in ol green tomorrow.

Its a 78' 300 6 banger:
- Bored 0.030" over with speed pro (sealed power) hypereutectic pistons.
- Complete rebuild including cam bearings, crank polished, new rod and main bearings, high volume oil pump (melling)
- Deck zero-decked (0.043") and head shaved 0.010" to make for 9.35:1 compression ratio.
- Crane Cams 260H cam 0.458" lift with crane dual valve springs, three angle valve grind, new vavles guides and seals
- Offy C four barrel intake manifold with a performer 600 thats going to be sitting on top.
- Since im a heavy mechanic at Highland Valley Copper, and damned near every damn piece of machinery is a Caterpillar, I thought i'd give cat a tribute and paint the block/head CAT yellow and the Valve cover/Manifolds CAT flat black.
- Going to be installed tomorrow, il post more pics after its in tomorrow.


11-08-2008, 02:50 AM
From what Ive seen in similar builds, I think 240HP @3000 RPM and 300+ Ft-LB @2000 RPM is very feasable with this build. It will breathe from EFI manifolds into a dual 2.5 in exhaust. If I want more airflow I will go for BBC 1.73 ratio Roller rockers to give 0.495" of lift with the cam.

11-08-2008, 02:54 AM
Very nice.

I was looking at doing a similar build for my 85 Bronco at one time

Let us know how it hops when ya get it in and running [36]

dirka dave
11-08-2008, 03:28 AM
Should be a torque monster... looks good.

11-08-2008, 12:38 PM
nice! wats the cost roughly so far? i got a I6 that i want to rebuild aswell, i gota get a lil more hp outa her.. 240hp/300+lbs is awsum, stock is 145hp/270 lbs on my 96.. looks good tho[cheers]

11-08-2008, 06:44 PM
cool I am looking for a 300-6 do you know where there is another one

11-08-2008, 07:00 PM
my step uncle did a similar build and got 280hp at the rear wheels of his 84 F150 (2wd) but that thing rips it up [36] nice work and like the colors

11-09-2008, 09:05 AM
So far im looking at a total of around $1750 with this engine, including the $1000 for machining. Another $750 for the parts including the four barrel intake, crane cam and lifters, and the hyper pistons. I have always got my engines from Kelowna pick and pull, they always have 300-6's kicking around there and all of them so far that ive pulled have been virgin un-machined engines.

Here it is with the intake and exhaust installed.

I didnt have any time yesterday to put it in the truck, but this afternoon it shall be thrown in.

11-09-2008, 09:39 AM
love it!

11-09-2008, 12:05 PM
isn't a 600 cfm carb a little big for a lower reving engine like that. unless my math is wrong, from my experience with my old motor any way that a 400 cfm would surfice just fine???? wouldn't it?

but then again double pumpers are always fun

11-09-2008, 12:09 PM
Nice build[36]

11-10-2008, 10:50 AM
On that offly intake think carb is to be mounted side ways
Can check it out on Fordsix.com ,been a few years since
play with the six . Ran a 580 holley on mine seen to work
ok would rev up to 5000 no problem , 390 holley is
supose to be hot set up . Good luck with the build , have
set of roller rockers for sell if your intrested .