Hey all, how's it going? I got just a general question I was curious about, just started day dreaming, thinking about it here at work. I'm not really good with engine building, but I know with an older engine you can bore it, like 30 or 60 over, or whatever, and gain hp, etc, better performance and so on and so forth. Now my question is, can you bore a new engine, say a 5.4L Triton on an F-150? Would anyone ever attempt it anyways, or whould that throw everything such as computer, ect. out of whack? Is it possible to bore a new engine? Does anyone know if anyone has tried it? Would there be a significant gain? I mean, I always here about boring an engine, my friend has a Chevy K5 with a 350 bored 60 over, but that's an older engine. And you always here of hot rodders boring their engines. But would you want to do it to a new one? It seems now a days, rather than modifying the block itself, people are more concered with slapping on exhaust, K&N Filter Chargers, Eaton S/Cs, throttle bodies, etc, but not so much actual engine stuff like camshafts, boring, pistons, valves, etc. What's gives?

Ryan
1986 F-250 HD 4x4
4.10 gears, C6 trany
351W, Edelbrock 351 Performer intake
Edelbrock Performer 600cfm 4bbl carb
Edelbrock Pro-Flo air cleaner
Extreme 4x4 camshaft
Flowmaster 30 series dual exhaust
Custom headers
3" Warn body lift

 

You can bore new engines. Summit Racing actually sells rebuild kits for the sohc and dohc 4.6 now. But if the block is not wore, why would you want to bore it? You might gain 5 cubes with a .030 overbore, but it's not really going to give you any more noticeable (sp?) power by doing that alone. Race engine's usually do it even with a fresh block, but do so with a torque plate to make sure the cylinders are absolutely round to keep a better ring seal (part of blueprinting and balancing proces). However you will not notice much in a daily driven engine.


15 second 1979 f-100 - 302, 3.70's, Powertrax Locker, MSD box, 2300 stall, headers, 4bbl. SOON to be 14 second 79.
I would rather PUSH a Ford than drive a Chevy!

 

Sure you can bore it but is it worth it?
my opinion on boring blocks is this.
if it doesn't need it don't do it. besides we are only talking about 30-60 thousandths of an inch. I have bored one of my engines .030 and the only reason I did this is to make the cylinder round again.
another though. most people consider .060 over the safe cut-off limit on how far to bore. if you go .060 over and something accidently goes wrong and you scar a cylinder, then what are you going to do.
However this is just my opinion

 

Cool, cool. I wasn't aware that it was really only to freshen up an engine. I thought people did it to give it a boost, more CI's, and drop in better aftermarket performance cylinders and the like. I personally don't have a 5.4L, but I was just thinking, if I ever had one and had the funds to do it, why not, ya know? Then throw on all the good mods to go with the new bore size. When you bore an engine .060 over, any idea on roughly how many horses you gain? Lets say a 1998 5.4L Triton is at stock 260 and you bore it .060 over. What could you expect to gain? Anything? Maybe 10, 15 horses and another .1 or .2 cubic Liters? I don't know, I just think it might be cool to say you have a new Triton bored .060 over and you have the horses to back that up.

Ryan
1986 F-250 HD 4x4
4.10 gears, C6 trany
351W, Edelbrock 351 Performer intake
Edelbrock Performer 600cfm 4bbl carb
Edelbrock Pro-Flo air cleaner
Extreme 4x4 camshaft
Flowmaster 30 series dual exhaust
Custom headers
3" Warn body lift