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Which would make more power in the long run?

JESSEGOTTA GP GT

JESSEGOTTA GP GT

New member
OK so, I know I wanna do a top swap for sure, BUT I got to thinking... If I did a top swap, with a good tune, and MAYBE a little smaller of a pulley (id be afraid I'd blow it up) and of course headers, blah blah (pretty much everything you'd need to run a 3.4 pully on an L67 ) would it be about even with an L67 (with all the mods to run properly) on a 3.4 pulley? I know about the whole higher compression on a N/A block being factored in...
 


Mod-for-mod, a top-swapped car should be faster compared to an L67 car due to the higher compression. I'm not sure if you could safely run a 3.4 on a top-swapped motor without either some big rockers or a decent cam, though. I'm running 3.4 with an XP cam on my 9.5:1 block and probably wouldn't want to go much smaller.
 
Yeah that's what I mean, I'd be to afraid of blowing it up with to small of a pulley, thats why I might consider just a whole L67 swap, just to be a little on the safe side.
 
cam IS DD friendly.

All in the tune.

3.29's aren't though, but you already have those.

Putting a blower on isn't, since it causes parasitic loss.

Should have went turbo?
 


ehhhhh I can't drop that much money on a turbo. And finding someone to tune around here is like looking for a needle in a hay field. I was going to purposely blow my engine up, so I'd have a good excuse to get a doner L67. I could always just buy an L67 and build it up nicely and drop it in once I'm done with it.....
 
The point of the top swap is your making more power out of boost...with the higher compression you don't need as much boost to make as much power. With a 3.4"/header setup on a L67 you'll make about as much power if not a little less than a top swapped car with some flow mods. So...IMO...cam it while its out. Even a little VS will be good because it is small enough to use the stock valve springs/retainers...that way with headers and a good tune you should be able to run a 3.4"/3.5" with no issues...and if your worried...get meth...and throw the 3.4" on there and play with the timing and see what you get.
 
just top swap it and run the stock pulley. youll notice a giant gain from where you are now and youll enjoy it at least for a little while. after a bit you can shoot for the '3.4 setup' which would probably be a 3.6 ish pulley for you, but honestly even running the 3.4 wouldnt be that hard. all it takes is a few flow mods and a good tune.
 
you guys are my hero's haha. Well, I guess top swap it is, I will more then likely run a stock pulley for a while, espically until I can find a good tuning place. I'm gonna start collecting parts next month, so I'm hoping to have it all done, late may early june-ish
 


so long as they arent stupid questions then i dont care. like if you dont research at all and ask me what pulley you can run or what parts you need for the top swap. my blood pressure goes up.
 


Like the VS I mentioned...granted...I DD'd an XP and it was fine as long as you started it in the cold and let it warm up.
 
bluegtp91 said:
Like the VS I mentioned...granted...I DD'd an XP and it was fine as long as you started it in the cold and let it warm up.
Click to expand...

X2 I've heard nothing but greatness for the daily driver factor of the VS cam or its overall powerband. It's just an easy cam to run.

But for now, I would just focus on the topswap if you are unsure of things.
 
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