Trick flow 290 or super cobra jet

Which heads for street have a victor4150 intake custom grind comp cam 685 lift Hyd 850 do stroked to 532

Do you have pistons?

No not yet Adney Brown is going to do the rottating assembly just trying to get some information and parts together talked with Blake Cartwright about a special grind Hyd roller cam all help is greatly appreciated

I'd use the SCJs if you don't have pistons.

what do you guys think the power difference would be between those two heads (untouched) on his 532

Thanks I'd like to know what y'all think also before I buy them

i like the tfs if both are right out of the box , had them both on a 521 ,

i have otb tfs streets on my 533 with only port matched to 4500 victor intake and 1150 carb. i love the setup, but lots of people seem to choose the scj heads over the tfs streets, though i'm not sure i've ever seen a direct head to head comparison.

Id be willing to bet the SCJ head will make a little more power than the TFS out of the box. The TFS having a slightly small port may make a little more torque.

Thanks for the help it seems to be close between the two ill probly go with the super cobra jets

Best bang for your buck would be the SCJ's since you don't have pistons yet

i thought they were both 290cc Ports?

Flow numbers (courtesy of charlie evans and scottyj)

TFS Street------------SCJ Heads
.100---67/51---------73/60
.200---144/100------155/106
.300---211/138------222/141
.400---275/169------275/177
.500---325/194------314/191
.600---351/211------317/203
.700---351/223------321/217

obviously flow numbers arent everything, the tfs vs scj topic has always interested me. Wouldnt smaller ports that flowed the same or more usually be the best choice?

The problem with those flow numbers which are quoted above,,,,,is that the SCJ heads come with a 2.200" intake valve that is not backcut. That's what is represented there as "Out Of The Box". However, with a simple $32-$35 backcut on the intake valves, the SCJ's flow changes dramatically and improves quite a bit. After backcutting the intake valves, the SCJ heads will outflow the TFS Street heads.

Uncle Charlie

so back cutting the valves will increase flow by 30cfm?

and does back cutting the valves cost $35 for 8 of them. (about 4 dollars a valve?). i don't know how much that service generally goes for.

The $32-$35 Charlie mentioned is for all 8 intake valves.

MauriSSio wrote:so back cutting the valves will increase flow by 30cfm?

My SCJ #'s a couple years back when Blake did them


2.200 w30* back cut
Intake

After
.100 84
.200 107.4
.300 254
.400 356
.500 358
.550 366
.600 367.4
.700 358

so back cutting the valves and nothing else is worth roughly 45cfm on the scj wow

MauriSSio wrote:so back cutting the valves and nothing else is worth roughly 45cfm on the scj wow

Yes, it's a big improvement, especially at the mid-lift flow numbers, and that's where you need to be focusing on.

Charlie

kinda shows the importance of details huh!

MauriSSio wrote:kinda shows the importance of details huh!

Never ever think all performance valves jobs are equal...... Thats why "you get what you pay for" from people that are in the know.

well if its only $35 i don't see why anybody would go to anybody else than charlie Evans!

i'm not planning on changing heads anytime soon, maybe even ever but if i knew you can get those kinds of gains with the scj heads for so little money invested i definitely would have gone the scj route. i still wonder how much power that translates to in a direct comparison!

MauriSSio wrote:i have otb tfs streets on my 533 with only port matched to 4500 victor intake and 1150 carb. i love the setup, but lots of people seem to choose the scj heads over the tfs streets, though i'm not sure i've ever seen a direct head to head comparison.

I made a 2,500 RPM to 6,500 RPM direct PORTED head to head to head comparison on Mile's dyno with my 434 Engine Masters engine; TFS, SCJ and P-51's
You should do a test with "out of the box" heads and tell us all about it.

i certainly know why i would rather do business with Charlie Evans than Randy that's for damned sure lol!! he's a man of the people and conducts himself professionally!