How are these heads? Any good for some porting or flow work? I just picked up a '95 351 roller for $50...fresh bore, just a bad lifter. Good buy as far as I can see. I also have a '74 351 that I was planning on using the heads off of, but if the '95 heads are any good I might just use those and save the '74 for something else.

 

i think they are the same as the 302 heads.....just with bigger valves and a different boltsize lol

 

They have the same size valves as a 302 . The earlier heads are better.

 

it all depends on how much money you want to spend.
and how fast you want to go.
if it wasnt an all out racecar, and you didnt want to buy some aftermarket heads, just look at each setof heads.
maybe take both sets to a machine shop and ask them, they will prolly tell you to use the older heads?
you can grind on the ports to open them up alot.
but dont grind on them too much, you might ruin them, so i wont try to tell you how to do it.
thats all you lol.
but yeah, i would prolly use the older heads, if they had a smaller combustion chamber, because compression is HP.
opening the ports up will help you out more than what most people think on stock heads.
it takes a while to do it right , but they sure do run better.

 

Thanks. I want to run high compresssion...I am pretty sure they will be decked. It will ba a track only car. I will just work up the '74's like I had planned and just keep the '95's as spares.

Now, someone told me that the '74 block is stronger than the '95...is that true? I plan on doing a 408 with the '74 and keeping the '95 basically stock to put in my5.0 for the street.

 

i dont see how either of the 2 blocks would be stronger than the other. i know alot of people claim that the older blocks are stronger, but never tell me in what way they are stronger. unless they fill them with concrete, or 4 bolt mains. or angled main bolts, which would be aftermarket blocks or machined thatway. maybe they are stronger, but i know i dont know, maybe someone on here knows? because id like to know myself.
im using a 351 block out of a 89 f250 i didnt want to go .60 over but i had too, to clean it up good...and havent had any problems. (yet)
alot of people say that mexican blocks are stronger because they are lighter.
thats not true, they are weaker!! > less reinforcement in the blocks.<( especially in gm blocks.)
and 202 valves wont pick your car up any unless you have your heads worked(opened up)on the exhaust side.

 

The castings for the earlier blocks are thicker. They wentcheap with the late model blocks. The Mexican blocks are heavier. They are cast similar to the earlier. You won't find many later model mexican blocks. Some of the 70's marine blocks were mexican blocks. The later model blocks are weak in the mains. They will start cracking down the mains.

 

Just a FYI on having the heads worked for your track car. For the cost of having them pro ported and a good set of valves you can buy a set of aftermarket alums ready to go and get more gain out of the box that the ported and worked stockers.

 

learn something new everyday, thanks for the info