[Hotsoss]

Did I make the right choice choosing Frankenstein M311 heads over the Texas Speed PRC 260cc heads?
The M311s are currently installed now and just waiting for custom pushrods to arrive.

Basic build:
416, Kong 2650, Custom Stroker cam and FBO.

Note: These are the non boosted version because I purchased before the boosted option was available.

 

[jcs003]

What is the flow data? @Rubber Duck @Lt1z

 

[Hotsoss]

What is the flow data? @Rubber Duck @Lt1z

M311

PRC 260cc LS3

 

[jcs003]

Just need a cam to match the heads you have.

 

[Hotsoss]

Just need a cam to match the heads you have.

I got GP Tuning to spec me a custom stroker cam for a 416 and the 2650.

 

[Lt1z]

I dont really think there is much difference between those two in the real world

 

[Hotsoss]

I dont really think there is much difference between those two in the real world

Okay, thank you.

 

[Blades1_99]

Did I make the right choice choosing Frankenstein M311 heads over the Texas Speed PRC 260cc heads?
The M311s are currently installed now and just waiting for custom pushrods to arrive.

Basic build:
416, Kong 2650, Custom Stroker cam and FBO.

Note: These are the non boosted version because I purchased before the boosted option was available.

Pic?

 

[Hotsoss]

Pic?

Pic of what?

 

[Blades1_99]

Pic of what?

The heads on the block

 

[Hotsoss]

The heads on the block

Unfortunately I don't have any pics at the present time since my car is at the performance shop (90min away).

The only pic I have is this one as they ran into issues to getting the headers back past the tab on the heads.

 

[Blades1_99]

Unfortunately I don't have any pics at the present time since my car is at the performance shop (90min away).

The only pic I have is this one as they ran into issues to getting the headers back past the tab on the heads. View attachment 154375

Couldn't cut the tab?

 

[Hotsoss]

Couldn't cut the tab?

They were unwilling to do any cutting on heads, so at my request they dented the headers (ARH 1 7/8). I think only 2inch headers clear the tab and I did not want to spend another 2k + for headers, so I had them dent one of the primaries. I hope it doesn't hurt performance to much, but I didn't think spending all that money was worth it. I could be wrong. I'll find out what kind of power it will make soon.

Here's a before and after denting:

 

[jcs003]

Speed engineering 2 in headers.

 

[Hotsoss]

Speed engineering 2 in headers.

According to Frankenstein those headers don't fit these heads without modifications.

 

[jcs003]

According to Frankenstein those headers don't fit these heads without modifications.

Too bad, it's a very economical option.

 

[subaru335i]

Pic of what?

Boihole

 

[subaru335i]

They were unwilling to do any cutting on heads, so at my request they dented the headers (ARH 1 7/8). I think only 2inch headers clear the tab and I did not want to spend another 2k + for headers, so I had them dent one of the primaries. I hope it doesn't hurt performance to much, but I didn't think spending all that money was worth it. I could be wrong. I'll find out what kind of power it will make soon.

Here's a before and after denting:

View attachment 154382

FWIW Enginemasters dented the absolute fuck out of some headers and did back to back engine dynos and found it didn't really matter.
It looks ugly but I wouldn't worry about it.

 

[Hotsoss]

FWIW Enginemasters dented the absolute fuck out of some headers and did back to back engine dynos and found it didn't really matter.
It looks ugly but I wouldn't worry about it.

Yeah, that’s what I was thinking, but was unsure. Thanks man 👍

 

[Lonnies Performance]

Could you get 2 gaskets & a set of header flanges to use as a spacer, to move the entire header away from the engine?
Not sure now much room is there for movement....