Gettin my motor together, its a 350 with flat top pistons with 4 valve reliefs, not certain what brand they are tho, motor is bored .030 over. i just recieved a 305 from a friend for the rockers and push rods and i would like to put the heads off it on my motor instead of the 76cc heads taht came wtih my motor. they are 601 heads. would the compression be to high to run pump gas, at least 93?

 

careful with those pushrods... was that 305 a roller cam? are you running a flat tappet cam now? or any other combination of the two types?

 

no, there both flat tappet cams in the motors. im just hopin that itl run ok on pump gas until i can get vortecs.

 

Very borderline, even with a fairly big cam. You'll be over 11:1 compression for sure, even with the thick .040 gaskets.

 

Are the heads off the 350 motor now?
measure the piston to deck clearance @ TDC.
CC the 305 heads chamber volume. (if its 53cc, its going to be high. If 58 to 60cc, most likely ok) What is the measured valve size on your 601's?
What is the casting number on the 350 heads?

the 601 305 heads do not flow well in stock form.
need full porting and larger 1.94 valves.

 

According to Fast355, 601 heads flow very well in stock form, he claims around 200cfm intake. With a 1.84 intake valve.

If they do end up being 53cc, grind your chambers a bit around the valves to reduce shrouding, and increase the chamber size a bit.

 

They do flow quite well in stock form (for a production line head) and the chamber design is one of the best GM had back then. It was a very similar design to the 'fuelie' chambers on the -461 I beleive, but smaller.

They worked quite well on my 350, even with 11.25:1 compression. Make huge torque, and the throttle response was unreal. The heads I have now dropped compression to about 10:1, but the throttle response just isn't what it was with those heads on there (that was the only change btw).

I would go for it - just make sure you have a cam with some very healthy specs or it won't like pump gas much. I used the XE274 and it was pretty borderline on 91, but it did work pretty well. Worked great on 94 when we had it here.

 

the heads that came with my 350 are like 882 or something, 76cc, so i dont want to use them. and the 601 heads are in great condition just greasy as hell. i plan to get out the dremel and attempt to grind the chambers a little bit and the intake ports i guess there called. this will only be a temp head thing until i get vortecs.

 

They should work fine. Grind the chambers a bit to enlarge them, but focus on the bowls and a bit on the ports.
Buy a cheap die grinder, speed controller and a few bits. You'll use it for lots of other things (like your future vortecs!), so it'll pay for itself.
Harbor freight has cheap 1/4" die grinders. 300W is the norm.
Go to home depot and get a ceiling fan rheostat (the ****), get a double junction box for it, and 10' of 16/3 wire or something, with an end on it. Wire it up. Then you plug your die grinder into that and now you have speed adjustment. (adjustable die grinders are much more expensive).
Hit up mcmastercarr.com or carbidebur.com to get some carbide burs. A flame (non pointed tip) with a 6" shaft is great, another with a 3" shaft and you're laughing. A handful of sanding rolls and an arbor and you're done. Then you can have heads that really ROCK.

 

alright thanks for the info so far guys, im so glad im finally getting this togheter after waiting so long im just needin a hei distributor now though and a bigger cam. what cam would be a nice one, one guy suggested a xe274 or is there a better one?i dont wanna make it un streetable but i want a lil lope to it. and also i know its hard to tell but what kinda of guess power would it be making? 350 with flat tops 4 valve reliefes bored .030 over with 601 heads that need porting, with stock hei dist and stock manifold and quadra jet carb and headers?

 

xe274 is a great cam for that app. Adam ran that and liked it. Not sure if he got any good times out of the car at the strip though....?

 

im just looking for streetability and be able to show off to my friends a little. i guess il get a xe274 or something close to that. just cant wait to get it running.going to put heads and intake on tommarow if it dont rain after i paint them and do a lil dremel porting on the heads as best i can. going wtih a chevy orange block and grabber green heads. i think it looks good so far .

 

That cam was great with those heads, it made an unreal amount of torque from about 2500 and up. Best time was nowhere near what it should have been due to other problems with the car unrelated to the engine, but mph was up around 100mph on hot days, a little faster on cooler days.

 

also i cant remember if i mentioned this but im using a quadra jet carb so will that be a good choice right now?i just got a job so il have money flow after i get my ticket tooken care of. and also how hard is it to rebuild a quadrajet. i have a little knowledge rebuilding a VW bug 2 barrel carb following directions and it wasnt that bad but will a quadjet be a big pain?

 

No, q-jets aren't bad. A shaved ape can rebuild a holley, they're so simple, but a q-jet is a bit more tricky. Nothing to write home about. Get a book about them if you want.
I'm purposely sticking with my q-jet, FWIW.