LT1-LT4 Modifications - lt1 info needed

Hello guys, pretty new to the ltx motor. I am planning a cam swap for my 93 a4 z28 soon and this is my list of parts:

Cc503 cam
1.6 rrs
Alex spring lt1 springs
New msd opti
Pnp on the heads an intake
taylor wires
Mail order tune

My question is do I need different injectors, if so what size brand? Is a 3600 stall overkill? Anythink else I should get or change while I'm there?

Lots of guys run the 503 on stock injectors. You can run a 226/232 AI cam with stock injectors.

I'm running almost the same cam on stock (new) 22lbs injectors. No problems with suppling fuel, even with a .035 fuel jet for a 150 wet shot.

The 503 is a bigger cam then you're running.

I think you're injectors are to small for your setup. Have you ever put a wideband on it?

Thanks for the replies guys. Is there anyone on the boards from around central oregon??

Also a wet shot doesn't use the fuel injectors. A dry shot would use your fuel injectors.

Hello guys, pretty new to the ltx motor. I am planning a cam swap for my 93 a4 z28 soon and this is my list of parts:

Cc503 cam
1.6 rrs
Alex spring lt1 springs
New msd opti
Pnp on the heads an intake
taylor wires
Mail order tune

My question is do I need different injectors, if so what size brand? Is a 3600 stall overkill? Anythink else I should get or change while I'm there?


I think some folks missed that.
IMO 22lbs injectors and ported heads/cam do not go together.
I would put an MSD cap and rotor on a stock opti NOT buy a complete MSD opti. Put the savings towards injectors.
Also consider your car is 20years old, it might endup needing a fuel pump to feed this. A perfect working order stock pump could likely feed it but again, your car is 20 years old so sometimes we have to change additional things..

I think some folks missed that.
IMO 22lbs injectors and ported heads/cam do not go together.
I would put an MSD cap and rotor on a stock opti NOT buy a complete MSD opti. Put the savings towards injectors.
Also consider your car is 20years old, it might endup needing a fuel pump to feed this. A perfect working order stock pump could likely feed it but again, your car is 20 years old so sometimes we have to change additional things..

Yeah I missed that haha.

96caprice.

Thank you I meant I was going with the full msd opti and does everyone reccomend a gm replacement pump? Any suggestions on injectors size brand?

Wasnt going with full msd sorry not sure how to edit previous post

Stay away from the Taylor wires. They fail quickly. Even new ones have been known to arc.

MSD wires work pretty good. Get fire boots for the plug ends.

My '94 ran best with the full MSD opti.

Thanks paul will defaintly remember that my car has 16x miles on it is it stupid do a cam swap car seems to be well taken care of good oil pressure don't burn oil. Had the heads done bout 20k ago by prevois owner in cali what you guys think?

16xk miles

You wouldn't be doing a cam or head swap unless it was for a performance upgrade. There's nothing wrong with that.

I'm just worried about bearing condition I guess if I get in there and I don't like what I see I can have the excuse to build my 383!!

When you do the cam swap, be sure to match the cam dowel pin length of the 503 to your stock cam dowel pin length by either tapping it in with a mallet or grinding it down. It will cause major problems otherwise.

93formula thank you, I have done a bunch of research on cam swaps an this is one thing I have made tons of notes on to not forget it, all with book marking about 8 sites with cam swap articles. I feel pretty confident. Does anyone know any good lt1 tuners here n oregon?? Idaho possibly??

93formula thank you, I have done a bunch of research on cam swaps an this is one thing I have made tons of notes on to not forget it, all with book marking about 8 sites with cam swap articles. I feel pretty confident. Does anyone know any good lt1 tuners here n oregon?? Idaho possibly??

Maybe check out this Northwest U.S. section here on tech, and maybe someone near you can help you out better.:cool:
http://ls1tech.com/forums/northwest-members-66/