Ok so my 305 is out of the car again and I'm gonna do a few things to it before I put it back into the new camaro. I want full roller rockers, a different carb type intake manifold, and I'm gonna port my 081 heads and gasket match everything. Ive picked out a few things and want some opinions.

roller rockers
http://www.summitracing.com/parts/PRO-66915/
intake manifold
http://www.summitracing.com/parts/HLY-300-64/
head gasket
http://www.summitracing.com/parts/FPP-1094/

Already have
http://www.summitracing.com/parts/CCA-08-500-8/ CAM
http://www.summitracing.com/parts/CCA-981-1/ Valve Springs

Motor was rebuilt 50K ago with new everything. I have flat topped pistons with valve reliefs so I don't think the 1.6 ratio rocker arms will be an issue. I have heard that I will need slightly longer push rods with the 1.6 ratio rockers arms but couldn't really get a yes or no answer or what length they need to be. I'm also worried that the valve springs may bind and that the heads will be over their limit for lift. I posted this thread in the engine board and didn't get anything out of it. Maybe in this board I will get some real yes or no answers. Opinions.....

 

My TG is not fast, but I have surfed alot in the TBI forum

Roller rockers maybe http://www.summitracing.com/parts/SCC-SCP1035BL/ the brand you chose are in some ugly post.

Intake, personally I would investigate further, not to end up like in the attached pic, below.

Gasket, depends on how much the block deck was milled.

Im planin to use that same cam and springs in a 350.

Not sure anymore how much lift the LT4 style retainer allowe on stock 081 heads, it comes up once in a wile. Anough for .480/.488" but could be at the limit for .512/.520".

 

Is that a 2" TBI or the stock size?

 

i havnt used that proform brand on a chevy engine but i used them on a chrysler and wasnt impressed, i had to machine different spacers as the ones that came with them were not adequate, and it was a cup style and broke a couple pushrods. were they too long? maybe. as far as pushrods, technically every engine should use custom length pushrods. you would have to buy a pushrod length checker and mock up the valvetrain and then adjust it to the ideal position.

 

Yes 2", found the pick in a tbi post. Even a stock 43mm TBI TB would be fairly restricted on such an intake.

 

Ok so ill switch to the scorpion 1.6 RR. Will the 081 heads work with this combo of cam and RR? Im worried about spring bind and max lift of the heads.

Requirments for the intake manifold are it has to fit under the stock hood and needs to be able to use a 2" TBI tb when I find one later down the road. Throttle linkage should be easy too. I dont want to tear up another 700R4 cause the TV cable wasnt right

 

I was wondering, dit u have the 8-500-8 cam in your 305 with 1.5 rr?

I think Manley has a spring retainer that could allow up to .525" lift on stock heads.

Could check aout fast355's posts for intake manifolds used on his high performance TBI builds.

 

yes i currently have that cam with the stock RR and correct Comp cam valve springs

 

What fueling upgrades did it require to perform nice?

Either you machined the heads or you probably already have the LT4 stile spring retainers.

 

I had the TBI chips.com chip, TPI fuel pump, and adjustable fuel pressure regulator. I think I had it set to 14psi. the vacum adjustable part didnt work very well so I set it and forget it.

 

EBL flash http://dynamicefi.com/ will help there.

 

amazing! I have a very similar cam. Just not as much lift.
Comp Cams 08-530-08

I went with a torker 2 intake though. I want to spray some n2o.

 

That manifold seems a little much for the rpm range of a 305. Do you have any othefr mods? any 1/4 mile times? Im def curious about it.


As far as the EBL goes. I have already looked into it and will most likely be doing that since it seems the easiest way to help tune the computer. I think ill be adding the wide band O2 sensor to it too.

What are these spring retainers that let there be a higher lift that were mentioned earlier?

 

I have shorty headers, #68 injectors, torker intake and the comp cams installed on a fresh engine. I've been working on the tune. I went to the
track with #55 injectors and only shaved a tenth from my best stock time. It turns out I was running lean @ 3k rpm. My datalog today says I'm running lean @ 4500rpm. Peak power for me is 5k, so I'm almost done. Next track day is june 16th for me.

I've read in different threads and local machinists that anything over .480 lift won't give you much more.

 

Its not the best weather for going to the track lately....DA is horrible or was last wednesday and friday while I was out there.....2,800 ft @ Kennedale which is like 660 ft elevation. With intake air temperature hovering in the 140*F area as I staged it is even worse.

What kind of exhaust do you have behind the shorty headers??? The stock setup is honestly junk from the exhaust flange of the head through to the tail pipe. There is NOT ONE SINGLE component I would re-use.

So if your best times run stock where in cooler weather with less DA, you could be doing better than you think.

As far as intake goes.....We put a Victor Jr 2bbl on the 305 Vortec TBI that is in my brothers 80 C10 truck. We are running the truck with the EBL and a BBC 2" TBI. Crane 272H10 camshaft. It pulls HARD. From 60+ it will take my Hemi Ram which is running a 14.90 @ 91 1/4 mile.

 

Im aiming for mid 13s with this camaro. I need to know things like how the throttle brackets hooked up and and problems that were associated with the intakes that were used. I need to get my shopping list ready so I can order all this and get the motor ready to drop in the new camaro

 

I never had issues with the throttle linkage on the Van because I ran the stock front-pull setup from a fullsize van that bolts to the TBI itself. I also ran a 4L60E for most of my TBI times.

All the intakes are going to need to be tuned, etc. They are all going to have their details for installation as well...

13s are VERY achievalbe with a 305 and TBI....You just have to get the right setup and dial it in correctly

By 90 mph my brothers 3,800 lbs 1980 C10 trucks 305 TBI/wide ratio 4 spd saginaw/ 3.42 G80 truck is 3+ car lengths in front of my Ram....He shifts around 6,100. I don't have a video of us racing, but my Quad Cab Hemi is now slouch.

http://www.youtube.com/watch?v=HUFeRMCb244

 

My exhaust has been redone. 2.5 pipe to a 2.5 y-pipe to a flowmaster. The flow is coming off next week and being replaced with a one chamber Jones muffler. The car was leaning out on the last pass with mods, yet had more mph and better 60'ft times. **When I run street tires, I don't lower the pressure.**

Best so far, 15.7 @ 89mph - 60ft @ 2.36

My goal is to hit a mid 14sec n/a street tires, high 13s w/ slicks, high 12s with n2o.

 

Im trying to find that "right setup" the first time so i dont have to change things later down the road. I dont want to have to touch the engine again unless it blows up.

 

The autoprom/tunerpro will be a life saver. Without it, you will be throwing parts at it all day long.

Are you going to run the stock heads?

 

Ill be running ported and polished 081 heads. Ill be getting the EBL for the computer and tuning things that way.

 

my friend has the ebl and swears by it. I may upgrade to it later, but I may actually make it to the track tomorrow. I'm waiting on a guy to buy my tpi setup.

 

Come on guys I need intake manifold options. What intakes are people using with the most success?

 

Single Plane

 

I thought dual plane was the way to go with TBI?

http://www.summitracing.com/parts/HLY-300-64/
http://www.summitracing.com/parts/PFS-52001/

Im leaning towards the the holley

 

EBL FTW. I have it, 350, 4k lbs wagon. 17 inch street tires, 2,1 60ft, 13.6/100 on the motor. 12.6/110 on the bottle. never got it back with the et drags. I have some video of the 13.6 run. it's definitely do-able to get the tbi to run pretty quick. The EBL/autoprom and tunerpro got me there though. with the bigger tb, cam, heads, intake, the stocker ecm and code wouldn't cut it, i couldn't drive the car!

 

I'd like to drop a note in here about the EBL Flash. With it there is no need for PROM burning equipment (such as the AutoProm), or an ALDL cable. The EBL has flash memory on board that is programmed directly through the same cable as used for data logging. And is included with the system.

liquidh8 has the older EBL Classic which does use a removable chip.

RBob.

 

X2, wish I had the flash, lol!