I recently bought a built 350 for my 85 trans am. i would like to know my aproximate hp. and what are some tips to do before i put it in ...is there someone who can help me?....thanx for any imput..here are the mods..

bored .30 over
flat top pistons
268 comp cam .477 lift
stock heads
double roller timing chain
headman headers
electric cooling fans
hmi 65000 vt dist.
accel 8.8 wires
edlebrock performer 2101 intake
holley 600 dbl pump carb
msd 6a ignition

 

Welcome aboard thirdgen.org.

Stock what 350 heads?

 

I'm not sure.. the guy said they were what came on the block. he also said that the motor was the last year of the manual fuel pump

 

Are the heads ported? We really can't even take a guess without knowing the casting numbers of the heads. Last year of the manual fuel pump depends on what the motor is out of, Chevy used the manual fuel pump until it was forced to change for the higher demand of fuel injection.

 

Pop off a valve cover and write down the casting numbers and post them up. The heads can change your HP rating from 200 to 300 or maybe even 300+... We can't make an accurate estimate.

 

i cant get to the motor right now so i called the guy i bought the motor from and he told me that they have 194 intake and 150 exahust. they have not been polished

 

Doesn't help. Some of the worst factory heads ever made had 1.94"/1.50" valve. So did some of the best.

 

ok i will get the casting numbers asap and post them...with the info given could you at least give me a best /worst case outcome?

 

also im looking into getting some heads while i have the extra$ so any affordable recomendations?

 

Dart or Etec heads. Both will run you around $800 for a set of heads.

Or you can pick up a cheap set of vortec heads.

 

I'm running Vortecs on my 357 right now. I'm pleased with them. I got them for $50 and they flow outstanding numbers for being mass produced stock casting heads. I would have upgraded this year but i got a Vette to finish for this spring. Maybe next winter..... Go Vortec if you don't have much to spend, if you have money go with a nicer head, its that simple.

 

Assuming the worst, that your 1.94/1.50 heads are 882 or 624's, probably in the 300 HP range.

Assuming better heads like 083's that came on L98's, about 350-370 HP. But, your intake and carb are a mis-match for your cam. Consider a Performer RPM and 650 double pumper, and you're probably more like 375 or better.

Vortec heads and Performer RPM Vortec intake, 650 CFM carb, you should be around 400 HP.

 

ok thanx...i am going to try to get the numbers off the heads tomoro. i have some heads that came off a 94 z71 with centerbolt valve covers out in the shed. are the considered vortec?

 

No, those are considered swirlports. Fine for a stock truck, don't do much if you want more than that.

 

DART or etec heads are not $800 They are more like $1200.00

 

oh....ok. i have been checking around but no luck yet. i got another tranny today it is a 700r for 250.00 with a shift kit does anyone know anything about it?...what am i gonna have to do to hook it up? ..the electrical..it only has three wires two of them are put together and the guy told me to run the other one to the break switch..good idea or not?

 

I had the 882 casting heads on my old 355 with a slightly larger cam and was making about 300 HP but near 400 TQ. I'd say you are about the same.

It's been a while but i think it put down 230 WHP and 320 WTQ through a TH400 trans.

 

the casting numbers on my heads are 8888893. any help?

 

i couldnt find them online but i found sum casting numbers that are close: 399899368-791.72/1.50
& 1.94/1.50115-17576 CC Chambers
Intake flow 150.8 CFM
Exhaust flow 91.1 CFM

 

THEY ALSO SAY HENCO EN MEXICO

 

The heads are from a truck that produces more torque that horsepower. if the casting numbers are correct you have 76cc chamber. most hot rodders will mill these heads down to a 64cc chamber and "hogg" them out to put 2.02 intake valves and 1.60 exhaust valves. if that has been done the heads will flow very well. But your cam would be not letting your heads breath good. but to find out if any of this has been done you would have to take the heads off of the engine and measure the valves. Another important thing to know is what valve springs you are using and what seat pressure is on the springs. there is alot of variables that could make this engine a good hp producer. just speaking from experence, you should take off the oil pan and make sure all of your caps are torqed properly. if you don't know what you have, you should look through the engine to make sure that everything is good if you still have it out of the car. anyways, a good thing to do is to read up on what makes the best hp, bookstores are a good source for that. I bet I have made more questions that answers but hopefully I've helped somehow, good luck

 

THE INTAKE IS 194 AND EXAHAUST IS 150 I BELIEVE, STOCK SPRINGS I BELIEVE

 

Are you sure it's not 3998993?

 

YEA I DID SOME RESEARCH THEY ARE THE 993S OFF A GM CRATE ENGINE

 

ANY GUESS ON MY HP?

 

The cam is mild and the compression is most likely around 9.0 to 1. sounds like the engine maybe around 300 block hp. it would be a very reliable engine.

 

what about tq through the 700? and are the heads good to work with?

 

not trying to hyjack or anything but you seem to know your heads, (bcuz i dont) are 882's realy that bad?? not even with extensive porting? and are you saying stock l98's heads are better? and are the tpi 305 heads good?

 

The 882 heads are part of the reason the L82 Corvette barely made more than 200 net HP in the late 70s. They also love to crack around the exhaust valves.