dferg99

iTrader: (2)

Hey guys I just had a 408 built for spray, and was wondering will my tfs 215 perform well or should I sell them and get some 225's or bigger. I plan on spraying a 300 shot at this motor. Compression now is a little over 11 to 1. The tfs 215 have 64cc chambers straight out the box. The cam is 25x / 26x range. How much am I leaving on the table with these heads? Maybe I should see how it runs then decide lol.

30th t/a

iTrader: (51)

Here is a 408 with TFS 215's

https://ls1tech.com/forums/dynamomet...8-results.html

djfury05

iTrader: (30)

TFS 235's or bigger

chrs1313

iTrader: (24)

Agreed all the way...

Need more head to get the most out of the setup

Sprayed1998

iTrader: (10)

My 403 made just over 500rwhp with tfs 215's and a smaller stroker cam. Have since added 1 7/8 headers, 3" exhaust and an electric water pump. Looking for 525 or so. Makes really good low end power compared to the bigger heads, just depends on what you like.

wildcamaro

iTrader: (15)

Go big or go home lol. Selling afrs is as easy as it gets

My6speedZ

iTrader: (18)

You can also have them opened up by TEA if you wanted. That 408 post doesn't seem to optimized. I imagine that those 1 3/4 headers are hurting that set-up.

LS2 bait has some 215's on his LS3 416 that were opened up for the bore and he has a strong set-up so it can be done.

oldguy99Z

iTrader: (2)

I agree with the guys saying go bigger like 235's and if your gonna spray it alot check into the nitrous exhaust port that TEA does.

reeperz28

iTrader: (1)

Seen really good results with 215's on larger cube engines but they will sell themselves of you wanted to go bigger.

dferg99

iTrader: (2)

Yeah the more I think about it the 215's are better suited for a smaller cubed motor. Anybody wanna swap some almost new tfs 215 for some 235's lol

My set up thus far 104 lid, 100 maf, fast 102, 1 7/8 headers, cut out, tfs 215 (unmilled). The cam is gonna be in the 24x / 25x range. I think she should breath good with what I have and not choke the motor up top?

mark21742

With the can your running I would definately get your compression up higher....I'm running 12.5:1 on mine and have no problems running 92-93 pump gas

dferg99

iTrader: (2)

Really, nice to know that. My engine builder told me any higher and I wouldnt be able to run on pump gas. I thought about milling the heads to bump up the compression, but wasnt sure if that would hurt me since im spraying a large shot. Don't want to compromise the thickness of the deck. Any and all input would be greatly appreciated.

My6speedZ

iTrader: (18)

My cylinder heads are milled to 59cc which gives me a compression ration of 11.5:1.

I have PM'd Brian Tooley a few times talking with him about a combo I want to put together when I am ready to pull the trigger which will most likely be a 416 using my 215's I have now and having them worked over a little bit with a custom cam.

As far as deck thickness isn't it something like .006 or .008 per CC?

dferg99

iTrader: (2)

Yeah you are right about the thickness. I think with the right cam, and head work these combos will be very stout. Maybe I will just mill my heads and see what type of numbers she makes.

chrs1313

iTrader: (24)

Dcr is what you want to be concerned with not scr...

I would keep it 8.8:1 or lower, also no timing over 28* helps too, tighter quench, optimized good chambers...it all is important to reduce knock

dferg99

iTrader: (2)

So Chris are you suggesting dont raise the compression anymore by milling the heads, keep it a little over 11 to 1

mark21742

Yup exactly. I'm sitting at 8.22:1dcr.

Lots of people just don't think a big cam drops dcr that low, so they say "stay at 11:1" or whatever without thinking about how low the dcr or cranking psi will be after dropping in a big cam with a late intake calves closing point

BrianSF-GA

Here is another stroker example with TFS 215's only it's a 402 ....



The TFS 215's flowed ...

0.100 59.6 68.3
0.200 121.9 139.8
0.300 186.7 218.5
0.400 231.4 270.9
0.500 254.2 304.3
0.550 260.2 314.8
0.600 266.1 321.8

Before the comments ... yep ... the 1-3/4's and the 215's are probably hurting power in the higher rpms, but, for now, I am concentrating on suspension and hooking it before looking to add power.

FYI, this curve was through the 10-bolt with 4.10's on 10-spokes with 275's ... !

My6speedZ

iTrader: (18)

Always liked your combo, I have the same cam and would imagine that on a 402 its pretty tame.

30th t/a

iTrader: (51)

Those power curves are beautiful for a street car! That torque must feel unreal!