Need 375+ RWHP naturally aspirated

[rj95svt]

If you want big power no doubt the 351 based engine is the way to go but for your 375 rwhp goal it isn't needed. You will deffinatly be better off with a aftermarket block if you plan to put nitrous on the engine. I think I would shoot for a 10.5:1 sompression ratio with aluminum heads and EFI and a good tune you should be ok on pump gas. I like the AFR 185's they are great heads and would more than likely meet your goal. I said I would use the TFS cnc'ed 185's mainly to try something a little different they are more expensive but if the flow numbers trickflow advertise are correct they are great flowing heads. I honestly think that 400rwhp would be possible with a combo like this. This is just a opinion though I haven't built a 331 or 347 stroker.

Here's a link to the TFS flow numbers
http://www.trickflow.com/product/fordcylinderheads/cnctwistedtrack/pr_cnctwisted_airflow.asp

 

[Flavadave4]

375 at the wheels out of a 306 or 331, 347 is a challenge........why challenge yourself and then come here asking for help?

 

[Marz]

If you want big power no doubt the 351 based engine is the way to go but for your 375 rwhp goal it isn't needed. You will deffinatly be better off with a aftermarket block if you plan to put nitrous on the engine. I think I would shoot for a 10.5:1 sompression ratio with aluminum heads and EFI and a good tune you should be ok on pump gas. I like the AFR 185's they are great heads and would more than likely meet your goal. I said I would use the TFS cnc'ed 185's mainly to try something a little different they are more expensive but if the flow numbers trickflow advertise are correct they are great flowing heads. I honestly think that 400rwhp would be possible with a combo like this. This is just a opinion though I haven't built a 331 or 347 stroker.

Here's a link to the TFS flow numbers
http://www.trickflow.com/product/fordcylinderheads/cnctwistedtrack/pr_cnctwisted_airflow.asp

Well this will be a street car that I am planing on keeping so I will go with a 331 or 347 and just see how much HP I can make and will definantly be going for the most HP possible.

I have another question. I've never ran a nitrious setup before so I was woundering if compression plays a part in how much NOS can be sprayed?

 

[Yellowpnoy]

Why dont you go with a bigger set of heads like the AFR 205's or some Dart 195's? They will work fine on a 331 or 347 and make some great HP to go along with it, get a nice custom cam and you should make some decent HP with it.

Anthony
427w

 

[25thmustang]

Nitrous is not like a turbo or SC. You will be more than fine with 10-11:1. I have seen 14-15:1 motors spray... Your not forcing more air into the combustion chamber, so no worries there!

 

[Marz]

Nitrous is not like a turbo or SC. You will be more than fine with 10-11:1. I have seen 14-15:1 motors spray... Your not forcing more air into the combustion chamber, so no worries there!

WOW if I could get 375 HP with a 150 shot of NOS that would be really NICE That would be pritty insane for a street car

 

[GT_green_GT]

nitrous likes high compression.

 

[25thmustang]

WOW if I could get 375 HP with a 150 shot of NOS that would be really NICE That would be pritty insane for a street car

Yes it would, but getting the 375 N/A rwhp is going to be the hard part. Not impossible, but definately a challenege.

 

[ninety15.0]

The problem with 375 rwhp N/A is that you arent going to have such a docile street car when you're done. To get that kind of power you are going to need a stroker with big HCI...and all the supporting mods. I think maybe you should shoot for 325-350 rwhp and then toss a 150 shot on there. 325-350 rwhp is still going to be a lot of fun on the street...and with a stroker it would be easy to do without revving the piss out of the motor! good luck man

 

[Marz]

The problem with 375 rwhp N/A is that you arent going to have such a docile street car when you're done. To get that kind of power you are going to need a stroker with big HCI...and all the supporting mods. I think maybe you should shoot for 325-350 rwhp and then toss a 150 shot on there. 325-350 rwhp is still going to be a lot of fun on the street...and with a stroker it would be easy to do without revving the piss out of the motor! good luck man

I'm curious to know about how much NOS can a 331 or 347 take with Forged Pistons, Forged I-Rods, and cast steal crank?
Could it take mre than 150? I won't push it harder than that but just woundering what it could take.

 

[25thmustang]

Depends on a lot of factors, but a 150 shouldn't kill it.

 

[Venom351R]

Im runing a 351W 5.8L and Im at 340RWHP 390RWTQ. Mods are in my sig. There is still a lot of room to grow since I only have a Cobra intake that is choking the hell out of the 351 and that intake dies off at 5,000 RPMs. Im going to swap over the intake and try and find a better cam for my combo. I would like to break the 360 RWHP mark N/A if not more.

This is the intake I want to get

http://store.summitracing.com/partdetail.asp?part=TFS-51511004&FROM=MG

I found it cheaper through here though.

http://www.treperformance.com/Intakes/Trickflow/Trickflow351.html