i have a 1967 327 i am putting in my 1968 camaro.wich heads would be the best for my block? the casting on heads are#462624 or #3998993?

 

Valves the same size? do the 624s have screw in studs? Both are open chamber heads neither flow great maybe will support 350 hp in stock form that is prob optimistic. I am doing a set of vortecs now I think they offer more advantages.

 

yeah they have screwstuds .the 624 have



1.94
1.5
76 cc
what is the difference in performance with the vortech ? is it more than 50 hp ,i know thats kind of high .i want to get around 415 hp .

 

They have 64cc chamber much better design flow alot better will support arond 400 hp-- downside need a vortec specific manifold they are lift limited in stock form but afermarkets are not. The lift can be corrected by milling the guides. Mine will handle .470 lift stock most will enough to get 400 hp(at the engine). Combustion chamber is alot better design allowing a little higher compression before detonation. Here is a link to a discussion we are having on another site http://www.hotrodders.com/forum/fact...tml#post778591

 

With the vortec heads you'll get better gas mileage too. They swirl the air/fuel mixture for better atomization and therefore more efficient burning.

 

those 624 are also known to be crack prone
thin casting

 

great info .i have heard the 993 are pretty good for racing .i am not concerned about gas milage it will be a weekend car. the vortec sounds great but up here in chicago i would be lucky to find any.I could order them on ebay or something similar but w/ the shippingthey would cost around $500 mininum.could i port 993 to get me where i want to be? some body told me i could get 305 heads to work as good as the vortec

 

great info .i have heard the 993 are pretty good for racing .i am not concerned about gas milage it will be a weekend car. the vortec sounds great but up here in chicago i would be lucky to find any.I could order them on ebay or something similar but w/ the shippingthey would cost around $500 mininum.could i port 993 to get me where i want to be? some body told me i could get 305 heads to work as good as the vortec

 

I have a set of 993s and I do think they are one of the better flowing open chamber heads but to reach your goal they would require alot of portingand some way to raise compression ie decking block domesd pistons thin head gasket...if you read further into the link I gave there is a discussion on the 305 head can it be done yes alot of work resizing valves heavy porting all to get where the Vortec already is just out of curiousity call the local junk yard tell them you need heads for a 1999 chevy truck with the 5.7 vortec engine I paid $200 for the ones I have now

 

Thanks Griff .But i am going to keep the 993 on the block at least for this summer .They already areon the block .I will be using a holley dominator intake and 650 carb with a 700r how loopy of a cam do you think i can use with this set up ? which headers long or short sould i use?i might use 50-150 nos shot (just in case) would the set up handle it