Carbureted LSX forum - The replacement (91 B4C RS 4.8 swap)

As most know, I wrecked the 89 RS. Was a sad day, but all in all, I am ready to get back into a more comfortable third gen anyway. So, got lucky and today I traded my 5.3 from the 86 TA for this 1991 B4C police package RS camaro. I am stomping holy ground as yanking the factory, one year of 2 made as a RS, the stock tuned port injection. Someone had dumped in a 5.7 with aluminum heads from a 91 vette. Selling that and the T5 from it, and I am glad I got another factory 5 speed. My 4th one, all of them rally sports, but this one is truly special as the one RS I always wanted was a B4C police car.

Since it has the big brakes and is essentially a Z28 with RS badges, it has the beefier suspension and will be getting an attempt at autocross. I'll probably look the fool at first, but it looks like a blast.

Have a 2000 4.8, the T56 from the old 89, and the rear 10 bolt is a 3.42 gear set. Going to go stock with a carb, see what fuel economy it gets and see what it will run.

Previous best from my carbed L98, t5 with 4.10s in the 89 was 13.87 at 101, so we will see if the little replacement for the 5.0 liter from yesteryear can hold it's own with it's technology. Then it will get a cam.

Here it is, she has 2 rust spots I will cut out of the 89 to replae, otherwise, she need a nose, I have one, front spoiler I can get. RS from hawks, and the rocker I can get at the scrap yard.

http://i157.photobucket.com/albums/t74/ZONES89RS/26225452.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/65e6879a.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/2673a4fb.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/425eac96.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/c002c5bf.jpg

Between factory dual fans and all the other goodies, I will attempt to make this my nicest ride yet.

Cannot wait to drive her and get the86 TA running with the 6.0!

Hell yea man my car was a 91 b4c too 5.7 auto. They made 592 of them in 91. Prolly the only two that are ls swapped lol

Makes me wonder, cannot wait to get the body straight, get my good on....going to be nice.

That is a good looking car. I even like those factory wheels on the car. I would not shed a single tear yanking out that wheezer tuned port. I hated working on those motors.

I would have to stab a small cam in there while the motor was out of the car. There is a 220/220 and I think a 214/220 cam in the parts for sale section. Just sayin'.

Good find zane.
So the 6.0 is not going in this car?:huh:

Nice!!! Love the interior cant wait to see this done!

That is a good looking car. I even like those factory wheels on the car. I would not shed a single tear yanking out that wheezer tuned port. I hated working on those motors.

I would have to stab a small cam in there while the motor was out of the car. There is a 220/220 and I think a 214/220 cam in the parts for sale section. Just sayin'.

That made me LOL, "Wheezer TPI", sure sums it up! Since i am budget limited witht he wife out of work because of our newest child, i am also just curious to see how it will do camless. When i do a cam, i think i will give the small edelbrock grind a chance an do not have 600$ for new cam, springs and PRs.

Good find zane.
So the 6.0 is not going in this car?:huh:

6.0 is going in the TA with a 4800 converter, along with the 4.30 Moser. Then put the 150 kit on, see how much faster it is with an auto:)

Nice!!! Love the interior cant wait to see this done!

Going to put my gray 30th anniversary seats in from my 89, mess it all up!

thats gonna be a cool third gen when your done. i might have to use this thread as a test to see what performance you get from the 4.8/third gen combo since i wont be swapping till probly next year lol. keep us posted!

For sure, I am curious. If it was the 4.8 out of my 94 GMC I know it would destroy a l98 carbed for carbed, it has 243 castings stock. This 4.8 has the 853 castings. So flow is down compared to the other.

Yoink...

http://i157.photobucket.com/albums/t74/ZONES89RS/369227ec.jpg

Out with the old......

Yep, sucks I have ti work, will be a bit before I can work on it. There are 4 rust spots I need to fix as I await parts to get it running, goin to extend a loan to buy a mustang that I will be flipping for extra cash. With that I want to buy a 220 amp mig welder. Then I can do all the repair at home and make more solid custom pieces than my little flux core 110 will allow.

I did notice yesterday that the front damage had been because of slight impact, the head light support and core are slightly pressed in. Not biggie but I wish I would make it straight.

Sold the 4.8 heads, got some 853 LS1 heads, probably going to mill them .030-.040. Started porting them today, used to use pneumatic air tools. Found a Chinese electric grinder with elongated shaft, i still have my hearing and no air compressor to bother me and wait for it to catch up. Used a variable speed router to control it and slow to a usable speed.

But, the work seems better with the extra control, i am no pro but i do work that is free to me and makes more power. Going to use the edelbrock carbed Ls cam, will need a Performer RPM intake as well. The Vic Jr will work for temporary.

Here is some pics, looks better in person but gives you a idea.

http://i157.photobucket.com/albums/t74/ZONES89RS/CC023A10-05D0-4512-A7AA-4225985C58C1-742-0000019D8C3BD0D2.jpg

After some castrol super clean:

http://i157.photobucket.com/albums/t74/ZONES89RS/79F34D56-9FF0-4D94-8884-DCF2704B4FC7-742-0000019D9168183E.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/9C440C28-946B-4451-BC22-83BC3476D222-742-0000019DA41D33BF.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/F7527FC8-04DF-42B6-983C-BD781AE7D6D8-742-0000019DAE77D536.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/1C31C956-E4FD-498F-A098-33F08C5770BC-742-0000019DB3DEC120.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/BF89790D-7009-4B97-8AD9-052AC6237344-742-0000019DBCD3068C.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/D4D8B234-26F5-434A-81B2-9B2E42EF781E-742-0000019DC3130B75.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/34CA4CCB-724D-4B9C-8036-264F07267A39-742-0000019DCF15EB30.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/99B71BF9-D63E-4109-B06F-7F642A4B0C85-742-0000019DE19C8BE2.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/EB3860C6-DFE2-44BD-8BE0-456F20FB0EAE-742-0000019DD8BBAF57.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/F54C3EE1-D2A2-488F-8A48-618965A2FF4F-742-0000019DE4CAA842.jpg

http://i157.photobucket.com/albums/t74/ZONES89RS/6F0CB314-E1C8-414B-B4E0-D095FDC061D9-742-0000019DEA453411.jpg


http://i157.photobucket.com/albums/t74/ZONES89RS/B6EAE334-FDCF-4DCC-9E06-4BC8A2D3B358-742-0000019DFD5E9086.jpg


http://i157.photobucket.com/albums/t74/ZONES89RS/D91B3853-0E67-430C-8EB5-718F31E263B4-742-0000019DF933F17A.jpg



The tool for the job:

http://i157.photobucket.com/albums/t74/ZONES89RS/FC375D62-19EF-4310-995F-E354DB66A7B6-742-0000019E2393D6CA.jpg

Nice work

It is ok, if I had 80 grit rolls I could do better.

Just orders some 80 grit rolls, will really speed up the process.

lookin good, thats basically the same shit I did to my 317's.....why are ya wating to use the Edel Rpm...?

cool, looks good man

How the job going James?

lookin good, thats basically the same shit I did to my 317's.....why are ya wating to use the Edel Rpm...?

Not waiting, will use the Jr until
I get a rpm. I am tempted to pull the 317s off my 6.0 and port them as well, but I think I would rather do so to 243/799 and swap them out.

Its alright, im headed to your place later today, ill tell you about it

Any chance there is a shop around you with a flow bench?

Yea, there is. Not sure if I will spend the money on them though. Think they charged 60$ to test 1 intake and exhaust port on some 317s a friend rushed my to do, they went 276 cfm on the intake, and we're nothing as nice as these will be but these will max at 280ish at best usually since they do not move air like 233/799/317 castings can with a 2 inch valve, I would need aarger valve with these and I am not looking for max power, just as much as I can make for as cheap as possible yet not trying to make peak power. Still need some low end.

Well, started ordering parts. Edelbrock 2215 cam should be here today. Springs, locks and retainers came in. Need to finish the other head, drop them off for a valve job and mill them .030-.040. Head gaskets are in as well as head studs. Fixing to buy a new millermatic 211 welder, so life is going to get easier. Buying crap is easy, finding motivation to work on it is a issue with all that has happened as of late. But, ball is rolling.

Need to pick up the rear end from Nemess, he is selling me a 2000 model 10 bolt with 3.42. Should be better than the stock rear with less abuse and better working limited slip. Will eliminate the need for rear spacers with 4th gen offset wheels.

Cam came in, it says 220/220 @.050 on the cam card. Pretty dumb since it says 220/224 everywhere else.

Only 592 b4c camaros built in 1991. Both of ours are ls swapped. Only 590 more to go lol

Makes you wonder how many are left, I know I wish this was 1LE equipped.

Sorry to hear about the 89 but nice replacement. Ive got a 4th gen B4C.

Im ready to hear how the 4.8 does for you in that chassis. Ive got one in my garage I was thinking of throwing in my 95.

Will do better than the TPI 305 that was OE or the 5.7 Vette motor that ame out!

Will do better than the TPI 305 that was OE or the 5.7 Vette motor that ame out!


You really think so? A 4.8 vs L98?

Thats pretty amazing if it does! Glad I held onto it...

Well, stock for stock, the worst 4.8 made 270 hp, the best l98 made 275 or so. But TPI 5.7 vs my carbed 4.8 setup, I lean to the 4.8. Although the tpi will have more low end tq.