Prolly gonna sound a like a newb, but...

[Driver4r]

Yes, I know. I have 1st hand exp using too big of a carb on a 350. I had an 85 R10 with a 355. The carb it came with was a 600 CFM edelbroch. However, it was in poor shape and Jegs had a deal on a 750 CFM carb for $200. I took the chance and installed it. I got the truck running after installing the lightest springs and it was still dumping gas out the tail pipe. I wanted to replace the 600 with a 500 or 550, but those suckers were expensive!

I appreciate the offer, but I have an uncle who is a wrench head and I think we can tackle this together. Hopefully, all I need is a weekend to do the swap.

Next time just rejet it to smaller jets and rods. It will act like a smaller carb while still using the same housing.

 

[87ChevyR10]

Next time just rejet it to smaller jets and rods. It will act like a smaller carb while still using the same housing.

I don't think I made it that far before being forced to sell my noisy, stinky truck...

Anyhoot, I keep reading and reading to keep the TBI system installed. I would like to if all I had to do was mount it to the new intake. But it seems the stock fuel pump isn't able to provide enough PSI and the jets are too small. Keeping the TBI would allow a plug'n'play fuel system. I guess what I need is more research and input on setting up the TBI on the ZZ4 engine.

Ok, while typing this, I was reading the spec sheet for the ZZ4, it only needs 6 psi of fuel pressure @ WOT @ a minimum. Is that sufficient for the TBI? I hope so!

Thanks!

 

[Duckaholic1]

Adapter plate

TBI will give you all the air and fuel you need. There is a big difference in buying parts for strictly speed and buying cool parts for a street vehicle. A carb will give you more flow but the benifits of efi outweigh that bigtime.

That crate motor has a ton of **** you really dont need, you can get a longblock much cheaper without a carb and mechanical fuel pump. If you retain the TBI everything will mostly be bolt on.

I have an extra adapter plate, I ordered it for my big block and did not realize it was for a small block tbi. I decided first person that needs one gets it.

Hello Irish, I would love to get my hands on that plate you mentioned. I am currently working on my 87 TBI. If that is posible, please send me a pm. Thank you!

 

[87ChevyR10]

Hello Irish, I would love to get my hands on that plate you mentioned. I am currently working on my 87 TBI. If that is posible, please send me a pm. Thank you!

No offense, you could have sent him a pm...

 

[87ChevyR10]

Another q, would it be wise for me to upgrade the torq converter to a higher stall with the ZZ4 engine? If so, what stall would I need? Thanks!

EDIT: Another q, what size 10-bolt does the 87 have and what gear ratio would I want to use? Thanks!

Edit: Here is my wishlist from Jegs: http://www.jegs.com/webapp/wcs/stores/servlet/SharedWishListView?listId=1454486&storeId=10001&catalogId=10002&langId=-1. Let me know if I missed anything. Thanks!

 

[gpmorgan]

I read the specs on the engine. High lift roller/hyd cam. 10:1 compression. 5800 rpm. Yeah it needs the 750 carb. Also recommends 92 octain fuel. You will need at least a 2500rpm stall converter also. I have a 700r4 tranny with a little more power than this engine that had 102k when I installed the engine. It worked ok but it was a little soft when shifting at WOT. I had it rebuilt with all the goodies and have been running it for about 7 or 8 years now. It will turn them over a couple of times between 1st and 2nd and sometimes bark them when shifting into 3rd. If you really want to get the most out of it, a rear gear change would be needed too. That cam in the zz4 would work good with a 373 gear and to get traction, a limited slip carrier would be needed. You should have a 8 1/2 in ring gear in the 10 bolt. The headers on your list could be swapped with Headman Elite thermo coated headers for a few bucks cheaper. They wont rust like the ones chosen and will be plenty big enough for your application. The thermo coating will reduce under hood heat also. I don't see a starter, fuel pump or carb on your list.

 

[gpmorgan]

http://shop.advanceautoparts.com/we...ble-bracket-holley_6124364-p?brandName=Holley
You will need one of these for your throttle and tv cables.

 

[Duckaholic1]

Good point!!!

 

[87ChevyR10]

I read the specs on the engine. High lift roller/hyd cam. 10:1 compression. 5800 rpm. Yeah it needs the 750 carb. Also recommends 92 octain fuel. You will need at least a 2500rpm stall converter also. I have a 700r4 tranny with a little more power than this engine that had 102k when I installed the engine. It worked ok but it was a little soft when shifting at WOT. I had it rebuilt with all the goodies and have been running it for about 7 or 8 years now. It will turn them over a couple of times between 1st and 2nd and sometimes bark them when shifting into 3rd. If you really want to get the most out of it, a rear gear change would be needed too. That cam in the zz4 would work good with a 373 gear and to get traction, a limited slip carrier would be needed. You should have a 8 1/2 in ring gear in the 10 bolt. The headers on your list could be swapped with Headman Elite thermo coated headers for a few bucks cheaper. They wont rust like the ones chosen and will be plenty big enough for your application. The thermo coating will reduce under hood heat also. I don't see a starter, fuel pump or carb on your list.

The list was built around using stock TBI parts. I could get the ZZ4 Turn-key package which has almost everything I need (carb, pump, and strter). The ZZ4 has angle head plugs and most other headers I looked at weren't compatible. I'll give those Hedman's a look.

So, if I used the carb setup with the ZZ4, what will I need to do in order to use the current fuel lines? I've read some about this and haven't found anything really detailed about it.

Thanks!

EDIT: My wishlist has been updated to reflect a carb setup: http://www.jegs.com/webapp/wcs/stores/servlet/SharedWishListView?listId=1454486&storeId=10001&catalogId=10001&langId=-1

 

[gpmorgan]

http://www.holley.com/data/VirtualShow/Pictures/Large2607!2009-3-15!7H40M3S.jpg
Here is a pic of my fuel line set up. I cut the fuel lines at the firewall. Fuel supply goes into the fuel rail a the rear of carb. Flows to front into bypass valve and then out of bottom of bypass valve and returns to tank. Here are a few more pics.
http://www.holley.com/VirtualShow/chevy/silverado/2607.asp

 

[gpmorgan]

If you are replacing your fuel tank and using a mechanical pump, of coarse yours will be different. You will probably put all new lines from the tank to the carb. Just be aware of where you route them. Keep them away from heat sources(exhaust) and keep them from rubbing on frame(etc).

 

[87ChevyR10]

If you are replacing your fuel tank and using a mechanical pump, of coarse yours will be different. You will probably put all new lines from the tank to the carb. Just be aware of where you route them. Keep them away from heat sources(exhaust) and keep them from rubbing on frame(etc).

That much I understand. However, I don't understand what the by-pass valve does. Is it for the return fuel line?

EDIT: After closer inspection of your setup, you're still using the stock electric pumps. I noticed the mech. pump block off plate. So, that by-pass valve is really nothing more than a fuel regulator?

I think I understand your fuel setup now. Thanks!

 

[gpmorgan]

You won't need the valve if you are using a mechanical pump. I'm using the in tank pump which is for the TBI. Since it pumps 9 to 13 psi, the regulator/bypass valve allows me to turn the pressure down for the carb, and have a return line for the excess pressure.

 

[87ChevyR10]

You won't need the valve if you are using a mechanical pump. I'm using the in tank pump which is for the TBI. Since it pumps 9 to 13 psi, the regulator/bypass valve allows me to turn the pressure down for the carb, and have a return line for the excess pressure.

That's exactly what I thought it was for. Sounds like to me, using the in-tank pump would be easier to setup than using the mech. pump.

 

[Jims86]

HOLY FUEL BATMAN. 750cfm for a 350 thats about 150-200 to much.

And ChevyR10 If i wasnt just a hair under 4 hrs from you, ide offer to come down and help. But damn, thats a hell of a long drive.

350's were equipped with 750 cfm qjets from the factory till 86. Engine won't really take more than it needs. Its the jetting thats a big issue, not cfm.

The list was built around using stock TBI parts. I could get the ZZ4 Turn-key package which has almost everything I need (carb, pump, and strter). The ZZ4 has angle head plugs and most other headers I looked at weren't compatible. I'll give those Hedman's a look.

So, if I used the carb setup with the ZZ4, what will I need to do in order to use the current fuel lines? I've read some about this and haven't found anything really detailed about it.

Thanks!

EDIT: My wishlist has been updated to reflect a carb setup: http://www.jegs.com/webapp/wcs/stores/servlet/SharedWishListView?listId=1454486&storeId=10001&catalogId=10001&langId=-1

You will need to Tune the **** outta that TBI(small block TBI is only about 430 cfm) to run a ZZ4. I would recommend getting a ported TBI unit, that would put you over 650cfm.