I was wondering what would give you the most power, porting the LT1's heads and Intake from hell and back with bigger valves and stuff, or just buying the LT4 heads and Intake!!!???!!!

 

LT1 heads with a good port job flow better than stock LT4s, but then again ported LT4s will outflow ported LT1s.

 

Port the LT1s. Ported LT1 heads can outflow LT4s with ease. DO a search and look at some member's flow numbers. Also it is far more cost effective to port your stock LT1s and get better results. Only buy LT4s if you're serious about the money because you're paying for the heads and the port work to make it worthwhile. Worked over LT1 heads and a good cam to match can bring you to 400+rwhp depending on the heads and cam specs as well as your combo's aggressiveness. The LT4 conversion is advertised at 425 fwhp with the Hotcam I believe which is about 370-380rwhp or in that ballpark. Overpriced and not worth it for the money spent.

 

If your going to spend more money on heads its not wrth while to buy and port LT4 heads, get a set of AFR's if you got the cash, simply cause they are heavier for applications such as N20 or a blower, less chance to lift a head or blow a gasket under high comp.

 

Ok So does anyone have a idea on how much it will cost, I belive i am going to just port the LT1 heads, I want to port them as much as I can everything you can do to them is what i am saying i guess haha, Is that LT4 cam a good cam, I am wanting a cam that will come alive at about 2,500 to about 6,500, Also will it be ok to go with 4.10's in a A4 has anyone did it and how do you all like it?

 

Stick with the porting of the LT1 heads.

 

If you can handle about 1200 bux TPIS here in Minnesota does a good job on their ported heads, i use them and so far so good.

thats is 1200 on a core exchange so if you can handle the shipping up here and not need your car i'd use them.

As far as a cam goes, the LT4 cam is ok but if you want a more agressive cam, they have like 5 cams for LT1's.

ZZ9 is their most popular, then is the ZZ409 wich i have its a .525/.525 cam got a sweet lope to it, then the ZZ9X i believe.

The ZZ409 makes about 10 hp more than the ZZ9 at anything above 3500 revs, i love it on the hwy.

And the LT4 conversion i think is over rated, there is really no difference in the intake unless you want a red one, just port mach yur LT1 intake and paint it whatever color you like. and it doesnt make 400+ hp at the crank, they rate the entire conversion at 375, but i can beat most cars with the entire conversin and a fiew other goodies to boot.

but do what you want, not what others tell you, make your own combinations, see what you like...

 

I laugh every time I see the 400+ rwhp head and cam lt1 cars, I have seen guys have a hard time trying to sqeeze 400 rwhp out of 383 lt1's with killer head and cam combo's.
Unless they are at one of those so called pro-shops that calibrate the dynojet to inflate the numbers by like 40hp.
The most I have ever heard/seen a stock shortblock lt1 pull on a properly calibrated dynojet is 380 through a fresh m6.
My car with a killer head and cam combo dyno'd at FLP at just above 360 rwhp and it's in the running for the most hp cam/heads A4 car on that dynojet.
chris...

 

Thanks for all the info, I know where a place is in the next county to me, called corrnets, there are supposed to be pretty good at this kinda stuff! So Ill get my heads and intake ported and polished I can put springs and Valves in myself.

I have some big plans for my car ran a 15.1 I aint to proud of that!

How much power do you think i can get out those heads and intake ported as much as they can, roller rockers, springs and valves, 30 pd ingectors, one of them zz or whatever cams you where talking about and a hole forged bottem end. I was also thinking about boring it to a 355 and a 150 shot any ideas on how much power this would make?

 

Thanks for all the info, I know where a place is in the next county to me, called corrnets, there are supposed to be pretty good at this kinda stuff! So Ill get my heads and intake ported and polished I can put springs and Valves in myself.

I have some big plans for my car ran a 15.1 I aint to proud of that!

How much power do you think i can get out those heads and intake ported as much as they can, roller rockers, springs and valves, 30 pd ingectors, 52mm throttle body, bigger mass air, LT1 Edit one of them ZZ409 cams you where talking about and a hole forged bottem end. I was also thinking about boring it to a 355, 4.10's and a 150 shot any ideas on how much power this would make?

 

The LT4 conversion kit is for people who don't want to go searching for the right parts. You can do better for less money. I got better heads, better rockers, and my choice of cam for about $1800. My heads outflow stock LT4s at any lift, and peak much higher. I got springs on the heads good for 0.600" lift and 7,000 RPM.

The big thing for me was all the other stuff that went along with the cam and heads. I installed headers, electric water pump, new opti, plugs, wires, new lifters, new chrome moly pushrods, ported intake, 58 mm throttle body, and a few other things I am probably forgetting right now. All told, the parts alone came to over $4500.

 

well like llfaro's sig says he is about 380's to the ground, i dont remember the specs on my cam or flow #'s on my heads other than the cam is a 520/520 AHH here are exact cam specs..


adv. dur 287/287
dur @ 0.50 226/226
lift .520/.520
LSA 112

heads are 2.0 intake and 1.56 exhaust 3 angle alve job titanium retainers and hardened pushrods

i need to get to a dyno to see what i do but with similar things should be 360's hp to the grd, by forging the lowers wot gain any hp but will take the juice better..

with the 150 shot i'd imagine 420's er so to the grd, with slightly lower tq
you should be into the low 12's, cut into the 11's and they'll kick ya off the track w/o a roll bar n crap

 

I think this funny When theres board members going 11's at 117 with long tubes and 150 shot

 

I Seen it done personally,
my friend has a 93 T/A with109k on it TPIS long tubes like i got and a 100 shot his best to date was a 11.7 @ 114 with slicks

 

As some have said, stick with the LT1's if you're on a budget . Everyone throws around the 400rw (sae) #... but not too many people actually do it, much less consistently. Do some research, there's good information out there if you can sift through piles of quoted flow numbers & dig up actual results

As far as the intake porting.. I'd save my $ in most cases .