Sorry to keep beating this horse but it aint dead yet.

This is what I found on a different forum. Similar to your setup I think.

94 Formula N/A, untouched stock heads, stock bottom end, stock rear end, 4.10s, long tubes, CC306, CAI, Vig 2800 stall TC, Pro-Built Automatics "Limited" Street 4L60E.
351.2rwhp/364.9rwtq
12.05@113.29 1.700 60'

The Car has a pretty big cam if not bigger than yours and is heavier than a Vette or at least big a little bit.

 

Interesting, except he has 4.10's which are HUGE in an auto car, exhaust work, and Aluminum heads. And we really don't know how heavy the car is. I weighed my car a the track it was 3480 lbs. Thats with a full tank of gas and the spare.

I'm guessing he spun the crap out of that stock bottom end as well. I'd love to see at what rpm he was getting those hp and tq numbers at especially with that gear ratio. On my old stroker with long tubes, stock exhaust(killer), mildly ported heads, 3.45's, professional tune, and same cam I was making about the same hp, tq, and track times that he was making.


Oh yeah, and I know he wasn't pulling 1.70 60's on street tires. I'm still seeing apples and oranges here.

 

just out of curiousity why would you even remotely consider comparing those two cars? that has too be one of the most mismatched pairs I could imagine to try and say should be similar.

1st of all, you must be skimming his post.. a straight plug buick roadmaster iron headed slug that had around 250-260hp MAX on its best day, and that is advertised flywheel horsepower.. that thing maybe made 210 at the wheels.. just a cam swap alone isn't gonna make up the difference between the two, no way on this wonderful planet can you get 140 rwhp from a cam swap on an engine like this.. so for his times and the engine he is running, those times are actually quite impressive.. the heads he has do not flow anything near what a set of aluminum castings do so anything above .450 lift is simply a waste cam lift.. the only thing that is helping it make power here is the larger duration and even though it hangs the valves open longer, the amount of air the heads can move in that period of time during the intake event is lack luster. if I had to lay money on the line I would say his engine is putting down about 265-270 to the wheels with that 106 mph.. with some tires, gears and some seat/track time with his new 6 speed there are some 13.20's @105-106 on a good day.

I have built a plethera of LT1 engines with about every cam and head combination you can think of, I am an avid head porter and have even tried iron heads for the hell of it.. there is a very big difference in all of them, and a cam needs to be matched to a good set of heads with best flow of the heads maxxing out the cam lift.. he is running a piece mealed setup while his other engine is being built as stated in the previous posts and is not doing a bad job all things considered.

so Mnvette, your times look very good with the six speed.. you will need to get the hang of the clutch and the launch rpm for this engine you're running to get the car moving off the line, and then you will get to relearn it when that turbo setup is complete. have fun rowing through the gears!

Chris

 

I agree. My cam is smaller at 224/224 and I'm running 12.7s on a cool day at 114mph with a 1.1 or 1.2 60' time.

I'd like to see those time slips. 1.1 to 1.2 60-footers are altered roadster, dragster numbers. It just isn't going to happen in a C4

 

Yep, that was a typo! - my bad. I meant 2.1 to 2.2. My 12.72 was with a 1.98 something anyway. So much for my memory too...

There's a couple time slips on my web site.

Dan

 

Dan,

I hope I did not sound like a critic. I wasn't not trying to be smart-***. You have an excellent ET for those 60-footers!

The only reason I even mentioned it was the original poster or someone else might think they should be able to match low 1-second 60-footers.

Geo

 

Not at all! I'm glad you pointed that out. I don't like putting stuff out there that isn't right.

Thanks!
Dan

 

94 Formula N/A, untouched stock heads, stock bottom end, stock rear end, 4.10s, long tubes, CC306, CAI, Vig 2800 stall TC, Pro-Built Automatics "Limited" Street 4L60E.
351.2rwhp/364.9rwtq
12.05@113.29 1.700 60'

Other than the heads and gears they are similar.
Red is better and bold is same.
ARE You all trying to tell me that going from iron heads to aluminum is worth 12 mph???????
Even with a heavier car? 120 hp difference in heads??????? NOT!

 

EVEN With the full manual auto and cam and a bunch of other mods you were making less power than a stock LT1 vette. Less than 300hp with the auto. about 275 hp. Doesn't that seem off considering a stock roadmaster is 260 and an electric water pump would do that? nevermind and exhuast, cam, and TB. DFI too.

Dont forget that gears dont add horsepower.

 

Here's what you are missing, first of all the differences are

HEADS
GEARS (20% greater)
EXHAUST


The only thing that I have over the camaro is the Mez pump(10hp). The Accel setup doesn't give you more horsepower it just gives you the ability to tune on the fly and gets rid of the optispark. And the 58mm TB hurts a 350ci more than it helps, you don't have much, if any, of a restriction with a 48mm on a 350ci so you loose alot of throttle control with the bigger tb, but that's all I had laying around at the time.

Gears will not add HP, but they will reduce ET and increase MPH, and a 20% increase from 3.45 to 4.10 is ALOT.

I am saying that heads, gears, and exhaust will add 6 mph to a car easily.

Oh, and are you sure those are the only mods that guy has?? So he really is running 1.5 stock stamped rocker arms like I am????? And he really doesn't have an MSD box at all?? Alot of time people won't mention the minor things to keep things less of a hassle to look through.