What is the fastest LT1 that is running through stock manifolds? Any examples that aren't a FI car? I did a search and saw some 11's on nitrous, but I'm wondering about a heads/cam car. I've seen some stockers and nostalgia street cars put down some crazy fast times and just wondered whats out there for us 4th gen guys.

 

Anybody know about this?

 

Why would anyone install heads/cam and still have stock manifolds? I'm sure there is someone out there with that setup but it doesn't make much sense.

 

heads/cam but no headers? That's the dumbest idea I've ever heard..

 

Yes, I am fully aware of the power to be made by headers. But Ive also changed enough burnt plug wires and header/collector gaskets on mine and others rides to know that our world is not perfect and **** happens. Just trying to get some ideas and hear about what others may have seen or done, not say that anyone is a idiot b/c they spent their money and made power with long tubes. Below is a rundown of last years shootout at the Factory Apearing Drags. All cars run through manifolds, 2 1/2" pipes and BIAS PLY TIRES. Almost everyone of them weighs more than our cars as well.

1 Terry Pennington 1969 Camaro ZL1 427/435--11.48 @ 122.5mph
2 Scott Pennington 1969 Camaro SS 396/375
3 Dave Dudek 1970 Dodge Challenger 426/425--11.44 @ 124.25mph
4 Lloyd Ray 1964 Ford Galaxy 427/425--No Show
5 Jim Goode 1963 Plymouth Fury 426/425--13.26 @ 105mph
6 Mike Wowk 1970 RoadRunner 440/390--12.32 @ 111.11mph
7 Randy Boyer 1972 Chevy Corvette LTI 350/255--13.7 @ 102mph
8 Doug Johnson 1969 Road Runner 440/390
9 Joel Nystrom 1967 Plymouth GTX 426/425--11.46 @ 124.97mph
10 Greg Gessler 1972 Buick GS 455/270--11.57 @ 119mph

 

I don't mind admitting that I'm an idiot. I love my rusty, ugly, impossible
to change plugs, cast iron manifolds. In fact it gives me great pleasure
to see that I can get close to the rwhp of cars with long tubes with my
stupid, inefficient cast iron logs.

I was at 293 rwhp with bolt-ons and am hoping to be in the 330 rwhp range
with my itsy, bitsy, baby cam. If the 26918 springs and the 794-16 retainers
arrive before the weekend, I'll be swapping springs and heading for the dyno.
If all goes well and the mystery of the ugly dyno graph is solved, it may just
happen. Don't have any track times, so this does not really answer your
question.

I also ran my 68 Ram Air IV cammed GTO with the factory high performance
cast iron manifolds and blew the doors off of lots of cars. And that's a 230/240
cam. I have to admit that I saw a significant increase in 5500-6700 power
when I installed headers, but the car still ran awesome with the logs.

 

You cant compare the stock manifolds on different cars, some are designed better than others. You are whining about exhaust leaks, but are going to swap heads and cam? Chances are you've got bigger things to worry about.

You need to just leave the car stock, better yet go buy an econo box that all you have to do is get in and drive.

 

I'm sure it's possible to run 10's through stock manifolds. It just a matter of how much money you got and how light you want to make it. Hell, you could drag an anchor behind you and make it into the 9's if you got the $$. But why would you? It easy power, and they sound sweet. And burnt plug wires? That why God created Zip-ties!

 

i remember reading RacinLT1 went 11.25@117? or so through his stock dual cat manifolds, ton of boltons and spraying

 

yep, spray the way!

 

stock exhaust manifold choke up the motor evem when it is completely stock..trying to make heads/cam car run through stock manifolds is a crime against nature man.

trav

 

There are old school Buicks running 455's with stock intake and manifolds ported and polished by Gessler in NJ which run 11 and 12's.

Some Buick folk have switched between his ported manifolds and TA/Poston/Hooker headers with minimal differences in runs like tenth of a second and a mile per hour or two.

Depends on the car and engine.

Fact is once an engine can inhale and exhale from porting stock pieces, it is better off.

 

buicks, not LT1's

 

Don't hate on me JCHEVY. I just wanted to know if anyone had seen any fast LT1's running manifolds. I know that headers MAKE MORE POWER. Thats why I have them on my truck right now. I also know that our cars are so well supported by the aftermarket that a lot of people never bother to think or experiment with what's allready available to them. I am new to the 4th gen world (not hot rodding) and know nothing about these castings or their potential, thats why I asked. I think I'm going to port them and see how it goes. Worst case scenario I'll allready have the bolt ons to support my headers. lol. BTW, the truck in the sig is daily driven on pump gas with street tires.

 

I port matched mine and removed a lot of material, especially on the outlet
side. Just used the GM gaskets as a template. I also recommend a 2.5" true
dual exhaust. The 2.5" true dual was 12 rwhp better than a 3" cat back
system on my car. Also, the benefits to headers don't really play out until
you have a good H/C package. Yes, there are gains on a stock car, but what,
like 5-10 rwhp, not worth the "red flag" in CA. Not all of us live in areas where
there a no smog rules.