Axid, these guys hit the nail on the head and offered really good advice. Agreed, you may get that kind of power but not that amount of torque unless you do a 347. We built a little street motor for my dads '75 F100 Explorer out of 302 that put out 345/350 from 306 CI.

The biggest thing that I'm scratching my head on with your guy is using a different crankshaft. The stock crank would be fine unless there's something wrong with it. We had to move up to 180cc heads to get our numbers, so like Motorhead was saying, it's going to need some aftermarket heads to achieve those numbers.

I can list out our build plan if you would like.

 

Too late for that (for all of us here)!

 

So, i talked to a couple other mechanic friends i have here in town and the consensus is that this is def going to be a money pit and not worth the cash to dump in such a small motor for such a big heavy truck. Started talking about stuff like drive shafts, transmisisons, rear ends and gear ratios and a million other things. They both said the hp numbers can be achieved but it will be costly and the motor would be on its hairy edge of needing constant upkeep and maintance and my "beater project truck" would no longer be that so i have decided this is "way" too much to undertake at this time. They gave some other suggestions for the same amount of money to do a motor/tranny swap to start off with and thanks to everyone here for their input. I finally finished the hooker header install late last night and ill post pics and write up of that damn nightmare, tonight.

 

Thaks for info. Yes, please post up or pm me. that would be awesome. I have decide to put this project on hold for now as it was turning into something i hadnt envisioned, especially cost wise..lol

 

+1 on the 351W, it has a better bottom end. Its better especially if you find a roller block. That-a-way you can drive the 5.woah until the 351W-427W is complete with some good heads (AFR ) and have a lot of giddy-up that can tow a boat and beat a civic-R dummy with the boat behind it. Its funny when a turbo diesel gets passed by a gasser. I've been on the receiving end up it and it really sucks....... my 6.0 couldn't keep up with an 80's C10 with a built 454 in it, their truck did have e.t. chalked on his windows I shouldn't of started that fight....

 

Drop a Coyote in that sucker...

 

Yes! That's on my wish list.

 

This was our formula: '75 302 block bored .030 over, then torque plate honed, 306 CI.
Stock crank balanced with rotating assembly.
Stock rods with ARP bolts.
Speed Pro L2482 pistons (would do something different now) about 9.63:1 compression.
Roush180 (Windsor Jr.'s) heads with 1.94/1.60 valves.
Comp cam - XE266HR, 266°/274° adv. 216°/224° at .050 .544/.555 lift. Ground on 110° LSA, installed at 106° intake centerline.
Crane retro fit link bar lifters. (would have used Morel now)
Comp Ultra Pro Magnum Rockers 1.6 ratio.
Edelbrock Performer intake.
Holley 600 cfm vacuum secondary with 1 inch phenolic spacer.
Hedman 1 5/8 headers.
12° - 14° initial timing, 34° total timing on 93 octane.
64 - 65 primary jets, 69 secondary jets.

341HP at 5600 RPM and 357 torque at 3800 RPM.

Since then we've changed up to a QuickFuel 650 cfm vacuum secondary carb. 66 Primary jets, 72 secondary.

 

Good info Justin, thanks for sharing.
My carb isn't jetted right, rich idle. I'd like to go to a 750 carb or terminator efi actually.

 

Thanks for all the info brother, that's a nice build actually..

 

No problem guys. I don't mind sharing info like that when it will help someone out. And thanks for the compliments.
Like I said, I would have done some things differently now. That was over 10 years ago. Parts are always changing and improving.

Blue04.5 - I would definitely go with a 750 cfm on a 347. But keep it vacuum secondary. Is it smaller or larger than 750? At least you have the Quick Fuel, I've been really impressed with ours.

 

Currently running quick fuel 680 vacuum secondary. I've been eye baling their 780 vacuum secondary for awhile just haven't pulled the trigger on it. I'd like to find a local shop and get the truck on a dyno for some tuning. I can't get the efi out of my head though. Undecided at this point.

 

Fuel injection is something I've always wanted to do on ours too. But i'd like to do a more tradtional 5.0L fuel injection system. But with modern upgrades and tuning. This place is probably where I would get that stuff from. Dunne-Rite Performance, Inc.

 

Since your kinda starting with nothing, you could start out with a 460 and all of a sudden, your power potential just increased dramatically.

Most guys with small block trucks modified, stroke them....so in a way by going bb now, your putting yourself in a better position.

 

Only reason I like the small block in my application is the lighter weight, and I'm more interested in corners than straight aways. For horsepower you can't go wrong with a 460 as a base.