94zgreenmachine

I just got this from trick flow and was considering this head to run. Looks like with a little work these things could flow real good. All numbers are on an "as cast" head.


Trickflow Specialties LT1 23* Cylinder Head

Specifications
Part Numbers: Assembled: 30400010 Bare: 3042B010

Material: A356-T6 Aluminum.

Intake Port Size: 195cc 2.07”x 1.26” Port Opening. (Stock LT1 port opening)

Exhaust Port Size: 75cc, 1.35” Tall x 1.50” Wide.

Combustion Chambers: 62cc.

Valve Sizes: 2.02” Intake, 4.690” OAL, 11/32” Diameter, .250” Tip TFS #51400211
1.60” Exhaust, 4.980” OAL, 11/32” Diameter, .250” Tip TFS #51400212

Valve Guide Material: Manganese Bronze, .500” OD.

Valvetrain Componentry
Valve Locks: 7* Steel, + .050” Installed Height. TFS #51400444

Valvespring Retainers: 7* Steel, 1.460” Diameter. TFS #51400423

Valvesprings: 1.460” Diameter, Dual Spring. TFS #31400414
125lbs Seat PSI @ 1.780” Installed Height.
375lbs Open PSI @ 1.180” Compressed Height.
420 lbs / inch Spring Rate.
.600” Maximum lift.

Valve Seals: Positive Clamp Viton Rubber. TFS # 51400454

Rocker arm Studs: ARP 3/8” diameter. TFS # 51400613

Pushrod Guide plates: For use with 5/16” diameter hardened pushrods. TFS #30400623-8

Flow Data
Intake Exhaust
.100” 50 57 Exhaust flow testing was done WITHOUT the use of a pipe.
.200” 135 98
.300” 191 136 2.02”/1.60” Valve sizes. All testing was done on an AS CAST
.400” 229 162 head.
.500” 253 176
.600” 254 189 Flow Testing was done at 28” H2O.

SStrokerAce

I know they can flow up to 300cfm Intake / 225cfm exhaust on the stock valve seats so yeah they are a good place to start. On top of that they have a much better coolant passage design than the AFR's which means more compression or more timing can be used, so therefore more power.


Bret

97WS6SCharged

Has Trickflow made any improvements to the casting since you found those thin spots Bret? I've been thinking about ordering a set eventually, but I want to make sure all the bugs are worked out.

SStrokerAce

Phil found the thin spots.....

I ordered some castings from the second batch and they look like they fixed the problem.

Bret

97WS6SCharged

Doh! That's right. Sorry about that.

SStrokerAce

No problem. I've had TFS heads on our bench that flow 300cfm/225+cfm that Phil didn't do. There is more there but it's all based on the application.

Bret

97WS6SCharged

So which do you consider to be the best buy for a FI street application. The TFS heads, Edelbrock heads, or the AFR heads? Since I've decided to use my eagle rotating assembly for my truck I may end up going with a different rotating assembly and a different set of heads if Brent ever finishes reworking my stockers so I can sell them.

SStrokerAce

Depends on your setup really. AFR's out of the box are usually good enough for a FI application. The TFS heads at least need some bowl work and prt sizing to match to your application. Other than that it depends on how much you are stressing the heads with heat to say go this way or that way.

Bret

94zgreenmachine

I just got in on the cam group purchase . I ordered the 233/239 cam with .569 int. / .577 exh. with a 1.6 rr on a 112 lsa. Should I get the trick flow and have a little work done or should I port the stock heads.I am building a 383 and need to save a little cash for the dyno tune and the 12 bolt I am gonna need! AFR are nice but the price isn't and I have heard afr's still need a little work. So really my choice is some llyod elliot heads or the trick flow heads with some port work done to them? Any help?

SStrokerAce

You could get the TFS heads and have Lloyd touch them up, or just have him do the LT1 castings. Still LT1 castings aren't optimal on a 383

Bret

94zgreenmachine

What did you do or what was done to the tfs heads that made them flow the numbers you got?

SStrokerAce

It was a stage III port job from a head porter we use who is very good. It's going with a package that includes a full valve train and ported LT4 intake manifold.

Bret

Spinner

Do the TFS heads want the LT4 manifold, or did you machine them to fit it? They seem a cheaper alternative to the AFRs, whats your opinion of shaving them to make for stock or higher compression?

97WS6SCharged

The whole point behind the TFS heads seems to be to lower the compression for FI stroker motors. You could always use a different piston to get your compression back up.

SStrokerAce

Well if you raise the port opening up enough which you can do you need a LT4 intake.

Bad thing is after angle milling we only got them into the high 50's for chamber volume which is not super for high compression. Around 12:1 on a flat top 383 and 11.1:1 with the stock 64cc chambers.


Going to a dome is not going to help on pump gas. So stick with flat tops.

Bret