Double Hump Heads??????

[RVT1000R]

I just recently bought a 71 C 10 longbed with a 350 we belive that this is the original motor (coads out to be a 70). The question is the heads are stamped 771 and there are 2 humps on the end of the head. Are these the desired double hump heads? I will try to post pic later.

[woodridge]

I couldn't find anything on the Moretech site ending in 771. What is the complete casting #?

[da-burb]

borrowed this info from the www

known mainly by the last 3 digits of their casting number, the most common ones to be found will be the

461
462
186
291
492.

[RVT1000R]

3927186

[VetteVet]

This will cover most of the sbc heads including the double humps.
http://www.jimsperformance.com/headchart.html

[lilpup69chevy]

i like to use mortec.com

[white82]

Originally Posted by RVT1000R

3927186

=186 these are 64cc dubble humps

[RVT1000R]

Thanks guys you have helped a lot, the next questiont is are theses as good as everyone says they are?

[oldschool79]

Originally Posted by RVT1000R

are these as good as everyone says they are?

In a word "no".

They earned their reputation as being good back in the days when there was little aftermarket competition for performance cylinder heads and before the the tens of thousands of man hours of research on air flow, combustion chamber design, etc. that have occured since the late 1960s.

A pair of cast iron Vortec heads is superior is every respect, along with a boatload of other modern heads in cast iron or aluminum.

However, if these heads have been rebuilt and are in good as new condition and you don't want to spend the money then go ahead and use them, but don't set your expectations too high.

[Zeke]

For their day best you could get. There better 'stock' heads made today such as the vortec heads which can be had for a decent price new. Other than a resto I couldn't justify putting alot of money into them.