FactoryFreak

iTrader: (2)

Here is my question.
What mods will I have to do to switch over to a manifold made for an 86 and older block. I plan on using the 350 block out of my 88 GTA. I'm looking at getting the Edelbrock Victor Jr manifold and then a Race Demon carb. If there are any other things I should look out for please let me know
Thanks

fireturd350

iTrader: (8)

It's to have to deal with the bolt pattern on the heads. They will have different angles than the newer style.
Check out the links below.


https://www.thirdgen.org/newdesign/tech/carbswap.shtml
http://5finger.8m.com/tpi2carb/tpi2carb.html

You're looking at a new distributor, new fuel pump and regulator (you can use a 3 port regulator to get pressure down for the carb, but it might leak). Basically you just need to start doing research on the topic. The links above should give you enough to go on to begin.

Also depending on the motor that Race Demon will probably be to much. I'm planning on just using a Speed Demon DP 750 and AFR thinks I'll make around 550 hp on my 383.

kfoley

If the motor is stock (like it says in your sig) then the Victor Jr will be too much. I would reccomend the Perfomer RPM manifold, it makes great torque but flows well enough to build upper end hp. I also agree with the Race Demon, it's too much. Personally I would just go with a good Holley 750 (VS for auto and MS for manual). You'll need and HEI style distributor and a good mechanical fuel pump (I assume the cam in it has a fuel pump lobe?). For that I reccomend a Holley Hi-Flow one (110gph or so @ 6-7psi).

F-BIRD'88

The vic Jr and race demon carb are best suited to a fairly radical high rpm motor. Needs a big cam, ported and or aftermarket heads, headers, a high stall converter and high rear gearing.

Fuel mileage will be reduced.

If you're swithing from TPI to carb on a relativly stock
or only mildly modified motor, then a dual plane type manifold is much better.

FactoryFreak

iTrader: (2)

Well the whole is engine is going to redone. Its not going to be driven on the street very much.
I'm looking at a:
383 Stroker (have the 88 block, and also a 69 camaro block to use)
Victor Jr Tall Manifold
Race Speed 750 cfm (possibly Speed Demon)
Brodix 18 degree heads
Comp Xtreme Energy Cam 300HR or H
Forged Internals
Vigilante 3200 Stall
TH400 w/ transbrake
Strange 12 bolt w/ 3.73's
Spohn Suspension
200+ shot of nitrous

Want to pull the tank and replace with a fuel cell and electric inline pump but not sure how it will work.
Let me know what you think.
Thanks

F-BIRD'88

Brodix 18degree heads can make lots of power but require a special intake manifold. special pistons with 18deg valve reliefs, special custom built headers. etc You'll want to use a 1150cfm dominator carb for maximum HP.

You should seek the assistance of a professional race engine builder shop to build this motor.

Contact www.brodix.com for the details.
This is not a bolt together.

Here is a pic of my friends Brodix 18 deg headed 406ci
Nova on a 9sec pass.

kfoley

Well 18* heads change the whole game...

fireturd350

iTrader: (8)

Yeah, I agree with that you can't beat the flow of a 18* head, but it racks up quickly at the checkout if you know what I mean.

Also be careful with that cam... Car Craft did a build up with one and they found it it hits the valves of their 195 AFR heads on a 383. So they had to tune down the cam a lot (meaning a new cam). Might not sound that bad but once you figure out we're paying a crap load (like 300 to 350 for a solid roller) out to Comp Cams for customs (We have to use small base circles with strokers) it hurts us average people a lot more than a big magazine.

If you didn't want to use a Speed Demon generally the way I understand it it if you go over 250 duration (actual) you're in the range that you can go to a Mighty Demon. Pretty much same as Speed Demons but you can tune them a lot more via the adjustable/removable air bleeds. Course if you go 18* all this stuff is off cause you're gonna need even more flow. Sounds like a screaming motor to me I want pics!!

Daishi

Not sure if this helps but my engine is from the Era of around 1969-1973 in there somewhere, and it was a real PITA to get her adapted to my 88 Camaro. The Power steering pump sits low and the pitman arm bruises the bottom of her. The belts didn't lign up, the altenator wasn't sitting right, wrong brackets. Just a real mess.
I got a new setup from a 1986 Surburban that had A/C. I cut off some brackets, and welded a few new ones, and hurray now shes almost working.

The reason it was a real pain was my heads do not have the 3 blot holes in them, so almost %90 of the brackets I could have used didn't work for me. Not sure if this matters, but its another thing to keep in mind

The gta master

i am right in the middle of doing a Tpi to carb swop right now?
If you need any help let me know.
Where are you located?

89rs/sc

when i originaly switched from tbi to carb all i did was buy a performer rpm, redrilled the center intake holes due to the angle difference, used a 600 edelbrock carb and a universal throttle and tv cable bracket (bolts to the rear carb stud) and used a fuel filter from a mid 80's jeep grand wagoneer (360 carbed) which has a return nipple off it . i then bought a purolator 1-5 psi fuel pressure regulator (usualy chrome with a dial **** on it ) and installed it all in this order.....


off the factorry pressure line i first went to the jeep filter,put another piece of hose off the return nipple on it and ran that back to the return hose at the factory connection, then i put thepressure hos to the cheap regulator , then i ran that line to the carb...

i use the filter with the return nipple so som pressure gets relived and sent back to the tank so it will lower the pressure a little but more so not to "dead head" the pump, then set the regulator at 5 psi, and that was it. .. never flodded ran it that way for almost 2 years,still am using this set up with my supercharger.....

as for the ignition i used a pre 81 HEI with vacuum advance and an adjustable vac advance.

i then also removed the check engine light....