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Discussion Starter #1
Hey Guys,

Looking to see track times and power numbers on a 351w using some sort of 11R heads. Thinking of swapping my heads out, old school canfield 192 heads 56cc on my 357w swap 10:1 compression motor.

Thanks

Eddie
 

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OP gave little information about what he has and would change if he switched heads (intake, cam, etc...), but does he gain a lot more switching heads spending $$$ vs. spending $ having his current heads worked some? The Canfields aren't bad heads. Or has the cost of porting gotten to the point it's close to a push; porting vs. buying new.
 

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I post realistic Engine HP.

A 408W 205CC heads will put out 550 Crank HP.

A 357W 205CC heads is probably going to pull at most 490 HP.

Your not going to pull 600 Crank HP with a HR 357W CI engine.

Its not that weak.

1.37HP/CI
Thats probably realistic of a catalog/corral build.
 

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Discussion Starter #7
Sorry I should of been more clear,

My current Setup is like so;

1. Dss Forged pistons .30
2. Canfield 192 heads 56cc
3. 10:1 Compression
4. 80's 351w block
5. Comp roller lifter conversion
6. Comp RR 1.6
7. Comp Cams HR .568 intake .576 ext Grind # FWFW344sS/3376s HR14,
8. BBK swap headers 1 3/4 long tubes
9. Vic Jr. EFI spyder intake
10. 75mm throttle body
11. 30lb injectors and pro-m maf

I am looking at how I can improve the over all power level. I just got this car and I want to make it more efficient to bump up the power.

Eddie
 

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408W 11R 205CC heads = 525-550HP Crank

In best world.

357W = 490-465HP crank
I know I am real late to chime in, but my 10:1cr 357w made 455WHP with untouched 190cc 11R street ports. That puts it at 535HP crank.
 

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Currently building a stroker 363 with about 11 to 1 and using the 11R205 heads with 56cc chambers. For the cam we are going with a Stage IV Trick flow. Aslo, got the R intake for carb. Was told the port match together pretty good. We are hoping to see close to 550hp at the flywheel
 

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Bone stock 351 Junk yard bottom end. 11r 205cc 56cc , F-cam. Victor Jr intake, 750 carb, 1 3/4 Shorty's, Comes out to 9.1 Compression.
C-4 footbrake 4500 stall and 4.10's goes 11.50 @ 118 in a 85 coupe. It could go lower 11's with a few small changes that I haven't had time for.
 

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I post realistic Engine HP.

A 408W 205CC heads will put out 550 Crank HP.

/CI
My 363 puts out more than that....

a 357 should be able to pull 550 at crank with an aggressive build.
 

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I know I am real late to chime in, but my 10:1cr 357w made 455WHP with untouched 190cc 11R street ports. That puts it at 535HP crank.
I’m building a 10.2:1 357 with 205 11r’s. What was your cam specs? I’m hoping to put down around 400-450 whp.
 

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My 363 with 205 11R heads and TFS Stage 4 cam and about 11 to 1 comp made 575/470. We also used a TFS carb intake and 750 Quick Fuel carb:

 

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I’m building a 10.2:1 357 with 205 11r’s. What was your cam specs? I’m hoping to put down around 400-450 whp.
Email Ed

The 11R is a much better head, but it depends on your combination. It could cost you power.

Since you're going to end up with about .600 lift, you might want to consider a new bottom end. Depending on where the cam does what.
 

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Email Ed

The 11R is a much better head, but it depends on your combination. It could cost you power.

Since you're going to end up with about .600 lift, you might want to consider a new bottom end. Depending on where the cam does what.
This is why I’m going with a blower 🥊
 

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Email Ed

The 11R is a much better head, but it depends on your combination. It could cost you power.

Since you're going to end up with about .600 lift, you might want to consider a new bottom end. Depending on where the cam does what.
It’s a stock crank but it’s got h beam rods and kB pistons in it, machine shop is gonna check ptv clearance and see if they need a pocket cut for the intake valve since the relocated angle for the intake doesn’t fall into the relief however the exhaust valve apparently does!
 

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Email Ed

The 11R is a much better head, but it depends on your combination. It could cost you power.

Since you're going to end up with about .600 lift, you might want to consider a new bottom end. Depending on where the cam does what.
Also cam was ground by Ed! Super helpful with everything I just wanted to see what others are making with similar set ups!
 

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It’s a stock crank but it’s got h beam rods and kB pistons in it, machine shop is gonna check ptv clearance and see if they need a pocket cut for the intake valve since the relocated angle for the intake doesn’t fall into the relief however the exhaust valve apparently does!
Most of the time they won't need an Intake pocket as that head has a ton of free drop. You don't give any cam specs or heat flow, or compression ratio to go by, but the 205 11Rs flow 321 @ .600 while those old Canfields are nowhere near that. Maybe 290, if ported correctly.

The point being, still, is that no one else's combination is ever going to be a predictor of what you're going to get.
 
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