creeper

I am needing to know what mods, if any, need to be done for me to install a set of '70 351w heads onto my '91 302 HO. The heads are 60 cc, with the large valves. As far as I see all I need to do is install the heads, 351 head bolts, 351 intake, and possible push rods. Is there anything that I have missed. And yes for those that may ask, I am getting rid of the fuel injection and going carbureted (cheaper to go fast carbureted than fuel injected). I am going to experiment from 600 to 750 and see which gives best performance.

myshifter

head bolt inserts since 351's use a 1/2 inch head bolt and the 302's use a 7/16ths. 650 carb is plenty

aode08

thats my setup lol

1.anyhow head inserts, the holes in the 351w heads bigger than a 302.

2. 351 heads miss the polution ports in rear, i loved that, id didnt like the tube on there anyhow.

3. Get thin racing ROL headgaskets for more compression, and or the heads shaved .10, i did both, very cheap !

4. USE HARDENED pushrods STOCK 302 lenghth etc. OH and yeah top it off with some 1.7 roller rockers or just use stock 1.6.

I run 13.4 in the quarter and AOD tranny, all day long and am very pleased with those heads.


you can run fuel injection just fine, its a direct bolt on.

aode08

[IMG]local://upfiles/23896/00178E595ECE44799CD070B5DC1E7215.jpg[/IMG]

[IMG]local://upfiles/23896/CCB9CD13DDD44210A86CC2AD3EA863D0.jpg[/IMG]

[IMG]local://upfiles/23896/BC78AAF2CA9340A3A13D59E3BB32D3E6.jpg[/IMG] see that bolt, there is a circular piece in the hole that reduces its size, just pushes in like a button, very easy! Also 1.6 ratio roller rockers and hardened stock pushrods.

[IMG]local://upfiles/23896/6B848E3EB45B460BB86396F1AF73A5EF.jpg[/IMG] felpro gasket and race ported and polished, huge intakes

[IMG]local://upfiles/23896/6FEFE6CC9E384EC8B44A9B88E8872C81.jpg[/IMG]

myshifter

the real downside to those heads, is if you run a spring with 175+ on the seat, you run the risk of pulling the pressed in rocker stud out.

aode08

175?

shot of nitrous?

5IVE.OH

Spring pressure. Not NAWS.

myshifter

no spring pressure, if you run a valve spring that has 175lbs+ of pressure closed on those stock 351 heads you can run the risk of pulling out the pressed in rocker studs. Those heads when used with a serious cam that needs a good amount of spring pressure to control the valves really need screw in studs, or at a minimum, pin the pressed in studs

aode08

i never knew stock ones came like that, my studs are screw in studs, rated at a very high tensile strength. I love machine shops[8D]

myshifter

ya someone put screw in studs in