Heads enough for 347?

Lwiss · Mar 1, 2011

Hello
I got a trickflow track heat kit sitting in my room, it will go as soon as the snow melts, Id like to stroke the motor to a 347 but i dont know if the heads would leave too much power on the table for the money ill put in a stroker kit, the heads are 170cc what do you think?

ivan12 · Mar 1, 2011

Usually you see a 185-205 head on 347s

BigTang · Mar 1, 2011

keep in mind a twisted wedge 170 is basically the same as an AFR 185, that said even then they are small.

What are your goals for this combo?

Lwiss · Mar 1, 2011

over 400hp at the crank

Addermk2 · Mar 2, 2011

it would be wise for you to just sell the full TFS top end kit and start with something bigger.

te cam and intake will also be restrictions on the 347... so would you rather install everything, just to remove it and replace it with better parts later, or right off the bat.

BigTang · Mar 2, 2011

it'll make 400 at the crank w/ those heads out of the box.

have them milled down, clean up the chambers and run a custom cam and you'll make over 400 at the tires if you're willing to run 10:1 or a little more.

blackpony · Mar 3, 2011

BigTang said:
it'll make 400 at the crank w/ those heads out of the box.

have them milled down, clean up the chambers and run a custom cam and you'll make over 400 at the tires if you're willing to run 10:1 or a little more.

Gonna have to disagree.. That intake will kill his power.. Now a box r with those heads, 10.5-11:1 with a custom grind MIGHT get him close to 400 but even then that will be a stretch..

Paul · Mar 3, 2011

I bet that combo makes eleventy three thousand e-horsepowers.

LAFENATU · Mar 4, 2011

Paul said:
I bet that combo makes eleventy three thousand e-horsepowers.

lol..

Venom351R · Mar 5, 2011

Depends on the compression of the engine, depends on the combustion chamber size of the heads. If your running NA and the heads have huge ass combustion chambers then I wouldn't use them

Lwiss · Mar 5, 2011

what if the intake and heads were ported?

OnyxCobra · Mar 5, 2011

BigTang said:
keep in mind a twisted wedge 170 is basically the same as an AFR 185, that said even then they are small.

The twisted wedge heads are similar to the AFR 165s, not the 185s. If my memory serves even the 165cc AFRs out flow the TFTW heads.

tooslow · Mar 5, 2011

OnyxCobra said:
BigTang said:

keep in mind a twisted wedge 170 is basically the same as an AFR 185, that said even then they are small.

Click to expand...

The twisted wedge heads are similar to the AFR 165s, not the 185s. If my memory serves even the 165cc AFRs out flow the TFTW heads.

false. the TW heads use a shorter port, so they have a larger cross section then their size indicates. the 170's cross section is more similar to a AFR 185 ect.

Air flow of each is still debated everywhere. AFR uses a 4.125" bore when publishing flow numbers, keep that in mind. The 165 flows more then the 170 when the 170 has a 4" bore and the 165 has a 4.125" bore, but what happens when both use a 4" bore?

TW 170 ~ AFR 185

tooslow · Mar 5, 2011

ivan12 said:
Usually you see a 185-205 head on 347s

^^This

For a 347 I'd be looking at either the FAC 190, or an AFR 205. I'd also consider the raised port heads like TF highports, Canfield 195's, or the Ford z304 heads if you have extra header space and use an intake that can feed them the air they'll want.

OnyxCobra · Mar 6, 2011

so you just confirmed that the AFR 165s outflow the TF TW heads which is what I said.

Addermk2 · Mar 6, 2011

OnyxCobra said:
so you just confirmed that the AFR 165s outflow the TF TW heads which is what I said.

what he confirmed, is that you cannot compare the TFS flow numbers and th AFR numbers, because they are tested on different equipment.

Venom351R · Mar 6, 2011

High Ports are bitchin!

Addermk2 · Mar 6, 2011

Venom351R said:
High Ports are bitchin!

If I could have found some when I was building my engine, I'd be running them myself. But I got my canfields for a STUPID deal... $650 for the pair. I put about $250 into them though. but still, $900 for a pair of heads that are one of the best out there?!

Venom351R · Mar 6, 2011

Yeah dont blame you there at all

OnyxCobra · Mar 6, 2011

Addermk2 said:
OnyxCobra said:

so you just confirmed that the AFR 165s outflow the TF TW heads which is what I said.

Click to expand...

what he confirmed, is that you cannot compare the TFS flow numbers and th AFR numbers, because they are tested on different equipment.

do the AFR 165s not usually make more power than the TF TW heads on any given build?