Hi there,

I am building a 350 engine for my chevy II project car.
Since I live in Argentina parts avalability is almos zero so I am gathering parts from here and there.
this is what I got:

Block
Casting # 3970010
bored 0.030 over
flat top hypereutectic pistons

I have 2 sets of heads:

# 462624

and

# 3748772
Both heads sets have been just rebuilt with no porting or polishing on them. They have standard valve sizes.



I need to know wich of these heads will work better on the engine with performance in mind not MPG.
Any advice will be highly appreciated since there are no real specialist around here.
Thanks in advance.

 

maby u could get a sbc book from ebay that deals with casting #s and such. that wold be the most reliable thing to get your info from. worth a shot anyway.

 

I did some research and these are the facts:

# 462624
this are 350 pick up truck heads (prone to crack)


# 3748772
this are 283 heads, maybe from a fuelie vette

I need to kow wich ones will produce more power and are more reliable for the block I have.
Please someone let me know what happen if I use 283 heads on a 350 block.
thanks a lot
again

 

i would think that the 350 truck heads would match better. iv heard of ppl going up with head sizes. like a 305 block with 350 heads, but i would think that a 283 head would be 2 small of a combution chamber.

 

THE LAST 350 I BUILT WAS VERY CLOSE TO WHAT YOU SAY YOU HAVE NOW. I USED THE 882 CASTINGS WHICH WERE TRUCK HEADS FROM THE LATE 70'S. I HAD NO PROBLEMS WITH THEM. I RESEARCHED THE HEAD CASTINGS FROM ARTICLES IN www.hotrodmagazine.com. THATS A GOOD PLACE FOR INFO. THEY DO A LOT OF COMPARISONS IN THEIR ARTICLES.