GMs 383 fast burn crate engine has 210 runner heads makes 425 hp
at 5400 rpm 460 lb ft torque. cams with too much duration are the
true killers of lower end torque.

 

Check the flow numbers on those GM heads vs the AFR 195 eliminator.

 

my guess would be they are edelbrock heads. the price was about
$509 per head not a bad buy for the money.

 

Yeah I did See...I was listening to educated, constructive responses of those who took my intended useage as a criteria. You and Kevin are my mentors....
Eddie
P.S. 406 is off to the dyno this week. I'll post results.

 

I would hasten to add that with the huge increases in hp that $ can buy some of those $$ should be spent on suspension upgrades, wheel/tires and make sure that the frame is solid. I have seen a few too many vettes with rotten or severely patched frames that the owners continue to add hp upgrades and nice shiney things but the car is a bloody death trap. A friend of mine had just finished installing a new high hp motor in a C3 and warned the guy that the $ should be spent on putting a new frame under the car. Owner spent over $12k on engine and paint made it about 20 miles before allowing a tree to stop him.
I can be put into the stock to high hp category when 5 yrs. ago MountainMotor designed my current 383 stroker. My only caveate was to keep it under 500 hp to help me from not being part of the forest. The guy has a solid track record building NASCAR and 1/4 mile dragboat engines so I lucked out and got all the parts at his costs with any machine work being done for $0. He put a fairly mild cam into it to keep it under my 500hp request, now I'm ready to beef up the cam a little (and yes I did take it to the track a few times for a save run to test my depends out). There are plenty of down sides to a lot of power but my wife and I are still alive due to being able to quickly accelerate out of the way of another vehicle. The same guy killed a family of 3 a few miles down the road from where he nearly hit us.

 

180cc is what I had at the time, and it took working much overtime and saving to purchase the 210's.

YUP...rear gear is down the road.
Eddie

 

i would think because the LS engines run so good we should try and emulate their design as much as possible.

High flowing heads. Similar camshafts ect.

 

Good guy...wish he was still around.
Eddie

 

Eddie, can't wait for the dyno results

 

i wonder why not very many ask about dropping their c3 weight before increasing their engine's power...C3 first step toward upgrading (and i mean the car as a whole, not only its power) is making it firstly a good turning around bends and braking performer THEN you should go into engine power and driveline uprating...

it would be useless to have 500 hp under the hood and not beeing able to stop in time at a crosslight or in a panic situation, same as it would be a nightmare to drive a car with plenty of power and go out of the road at the first sharp bend...

key iussue in our C3's is weight, dropping its weight makes the car easier to drive and to stop and mainly makes the driveability easier to be improved.

i can't even imagine how a 3.600 lbs could be driven or uprated without spending a small fortune, but if you get down to 2.900/3.000 lbs everything becomes easier and more affordable.

english got this point clear, that's why they've always built cars like caterhams or tvr's that with reduced weights from around 1.200 to 2.200lbs and powers from about 200 to 360 hp can easily get the $...t out of nearly any supercar around sharp bends and on 0 to 60 mph...

 

What is your budget? If the bottom end is stock and you don't want to change heads I would put headers on it and get the stock heads ported. Get an aluminum intake from a '78 to '81 'Vette and match it to the heads. Get a mild camshaft (212 to 216 degrees at .050" lift) and tune up the Quadrajet.

If you want to change the heads you could get some Edelbrock 60879 aluminum ones to take some weight off the front of the car.

If you have to pass smog you could do headers into a single 3" exhaust and the largest "universal" fit Dynomax cat you can find.

BigBlockk

Later.....

 

Also the cam that switches the firing order

I want to try one out

 

If you can spin the tires with 450hp, you don't have 450 hp. Maybe like 250. You need to tune that motor. 450hp will run 11 second quarter miles and break the tire loose at 50 mph. Not trying to flame you, just the hard facts.

 

Eddie if I can talk Anne into taking the vette to Chicago this summer we'll have some fun once again!!

 

Combo combo combo combo, intended use, combo combo, what you're willing to compromise, combo combo, budget, combo combo.
That about sums it up.

 

When I asked for input on my head choice for the 355 I'm building, a lot of people second guessed my cam choice. I even went back to Crane and asked them again if the cam I had chosen was big enough for me application, and the AFR 180 heads I had chosen. They assured me that they had originally helped me choose would be good for my application. My '71 convertible will never see the track, I want good torque a decent idle. Something that will be nice for cruises down to Napa, etc.

My '78 Firebird, on the other hand, is getting a 455, big heads, big cam, a TKO600, with the hopes of running 11s while still being somewhat streetable. But that's a whole 'nother story.

 

I run slicks, and do thequarter @110 mph I think 450 is right.

Stock converter makes the car alot slower. var's not made for drag racing anyways. for drag racing anyways.

 

Ok Check this out: Tests NOT DONE BY AFR!! http://www.adperformance.com/index.p...duct s_id=208 Check out the flow numbers, Engine build specs,Torque curve and peak HP. These are AFR 195 Street heads for under $1500 that outflow the old 210's. This power comes from using well matched components!!!THAT IS MY POINT!!!

 

whats the intake runner size on LS1 and LS6 heads?

i bet a lot bigger than 165cc


these engines are very mild mannored.

 

Yes, I bet they are bigger than 165 CC's and some are very mild mannered. They are producing big power with well matched components and still have great street manners! And I thought we were going to argue.