Hi

I'm new to the forum so please ,no flames .Can i used a 68-92 sbc heads on a LT1 block, can somebody please explain the differences. I ask because i'm getting some free parts a "baby LT1 4.3 v8 block and a pair of " cammel humps " heads 1.94" / 1.50" a Q-jet manifold and Q-jet. I will need to buy water pump, timming chain, front balancer ,153 tooth flywheel " will it fit the crank? "and a distributor, anything else you guys think i will need to make this mounstrosity work.I'm open to any sujections, but not the ones about getting a bigger engine, this is what i gonna get for "free" i have have no money to buy good; better ,performance parts " think no budget , zero, nada; freebie... I'm looking for at least a modest 300 hp/350 lbs/trq. Can this be put together and make run "a la Frankestein ".
Any help will be appreciated, thanks!
P.S.
And ,yes is going into my Fiero " some time in the future" . You guys are the experts on LT1 so i come to this forum for help and knowledge

 

Unfortunately, you can't put Gen I SB heads onto the LT1s without significant modifications. LT1 heads are a reverse-flow design, whereas all the other SB heads are conventional-flow designs. Sorry man, being broke definitely sucks. Good luck to you. Welcome to the board by the way.

 

What he said, they will not work. I've heard of people having the heads machined to work with the reverse flow cooling system, but that's not free. Depending on the bore of that block those heads might not work. I would also be worried about the valves on those heads being too big for the bore on that motor. You might do some measurements to make sure it will all clear.

John

 

Ok . But know i'm curious:" what kind of machining?"

 

And aren't our heads a different angle, and most SBC heads are 23 degees? I don't think it would be worth the extra machining, even if you were getting a deal on some, which it sounds like.

 

Are heads are also 23*.

 

Oh, okay, I was thinking they were 18 for some reason. My bad.

 

I have been looking into this as well. I trying to convert a set of Brodix to fit the LT1. The only machining I have seen that needs to be done is the head water ports would have to be modified to match the original cylinder head and drill the rear out for the water cross over pipe and the front for accesory bolt holes.

Oh yeah and redrilling the intake bolts to line intake ports up to ports on head and to be able to bolt intake down.

 

>I would (pesonally) ditch the LT1 and get an older style SBC since the Opti sucks sooo bad !

 

Thanks, for that positive reply " EviLZ28".

"bowtiepwr". I'm planing on using "carb" an a "Hei" ignition.

 

>smart move ... I hope you are getting the carb intake for the LT1 or the LT4 .

 

if your going to use a carb you will have to buy a intake manifold. and then you might as well buy some lt1 heads for cheap out of the for sale section!

 

you could get some cast iron Impala ss heads to go on there...oh yeah! I just happen to have a couple of Impala heads..hehehe..make me an offer if you want em..by the way, GM makes an intake manifold to fit LT1s to adapt to carburetors and conventional distributors to fit where that little plug thingy in the lifter valley on the block is. Best bet is get an older block. even a 305 is something you could use and they are REAL cheap blocks.

 

Just for the record, you cannot put the LT1 350 heads on the LT1 265 block.

 

I hate to say it but you are going to be nickle and dimed (or $50 & $100) to death trying to put that combination together. I've tackled far more reasonable frankenstien projects in the past and there is always something unexpected that comes up with making them work (if they ever work right).
My sugjestion would be to sell your freebie parts to get as much cash together as you can and start searching for a good deal on a complete motor (Carb to Pan & Fan to Flywheel).
Consider what it's going in to, what will "bolt in" without special mounts, what trany do you have, what will bolt up to it? Take the time to determine what the least expensive (simplest) combination would be and then start searching.
If you priced all of the pieces you'ld need to make what you have work you may find that you could pick up a complete used car for less.