BC GTA

So I have been researching various characteristic of 305 heads for a possible purchase and I thought I would share the results. Presented below is some of the pertinent information on the five heads that are available for these engines for a TPI system. The first set of information is on head characteristics such as valve size, runner size, combustion chamber size and other data.

The next set of information is intake and exhaust flow rates at different valve lifts in cfm. I recognize these flow rates are, in some cases, done by different people on probably different machines. However, after scouring the internet this is the best I could find. I have tried to cite sources wherever possible. I hope this is of some use to people considering heads for 305 TPI engines.

I could provide this information in tabular format for easier comparison in Word format.

Head Characteristics Data

GM Cast # 14102187
Intake Valve 1.84”
Exhaust Valve 1.50”
Intake Runner
Exhaust Runner
Max. Valve Lift
Combustion Chamber 58cc
Head Material Cast Iron
Spark Plug Straight
Price $310

GM Cast # 14101081
Intake Valve 1.84”
Exhaust Valve 1.50”
Intake Runner
Exhaust Runner
Max. Valve Lift
Combustion Chamber 58cc
Head Material Cast Iron
Spark Plug Straight
Price $310

GM ZZ4 Cast # 10088113 Part # 1255646
Intake Valve 1.94”
Exhaust Valve 1.50”
Intake Runner 163cc
Exhaust Runner 60cc
Max. Valve Lift
Combustion Chamber 58cc
Head Material Aluminum
Spark Plug Angle
Price $1,139.90

World Products S/R Part # 042750-1
Intake Valve 1.94”
Exhaust Valve 1.50”
Intake Runner 170cc
Exhaust Runner 65cc
Max. Valve Lift 0.560”
Combustion Chamber 58cc
Head Material Cast Iron
Spark Plug Straight
Price $829.90

Trick Flow Super 23 Part # TFS-30300006
Intake Valve 1.94”
Exhaust Valve 1.50”
Intake Runner 175cc
Exhaust Runner 67cc
Max. Valve Lift 0.540”
Combustion Chamber 56cc
Head Material Aluminum
Spark Plug Angle
Price $1,199.95

Notes:
1. Both World Products and Trick Flow have other heads in this product line that have different valve lift and other characteristics.
2. Price for 14102187 and 14101081 are for remanufactured heads from Clearwater Cylinder Head Inc. The other prices are for new heads from Summit Racing. All the prices are in USA dollars. The price is for a pair of heads and does not include shipping cost, handling fees, local sales taxes or any dutes.

Head Flow Data in CFM

GM Cast # 14102187
0.050” I35 E27
0.100” I 65 E54
0.200” I90 E113
0.300” I135 E120
0.400” I158 E133
0.500” I165 E140
Source:
ThirdGen Website by Fast355
See: https://www.thirdgen.org/forums/tbi/...heads-why.html

GM Cast # 14101081
0.050” I31 E15
0.100” I63 E37
0.200” I116 E78
0.300” I157 E101
0.400” I182 E107
0.500” I195 E110
Source:
ThirdGen Website by ME Leight
See: https://www.thirdgen.org/forums/tech...416+heads+flow

GM ZZ4 Cast # 10088113 Part # 1255646
0.050” I30.18 E22.78
0.100” I58.23 E47.33
0.200” I116.60 E94.01
0.300” I158.36 E126.00
0.400” I185.00 E144.96
0.500” I193.14 E162.18
Source:
GM High Tech Performance Magazine September 2000
See: http://www.herningg.com/projects/350heads.html

World Products S/R Part # 042750-1
0.050” I30.62 E26.93
0.100” I65.84 E55.87
0.200” I123.12 E103.64
0.300” I170.20 E123.24
0.400” I195.36 E127.98
0.500” I199.80 E129.56
Source:
GM High Tech Performance Magazine September 2000
See: http://www.herningg.com/projects/350heads.html

Trick Flow Super 23 Part # TFS-30300006
0.050”
0.100” I61 E53
0.200” I127 E105
0.300” I180 E142
0.400” I216 E160
0.500” I242 E172
Source:
Trick Flow Website
See: http://static.trickflow.com/global/i...%2C766bore.pdf

85gulstrandTA

Great job!!!!!!!!!! I like the 2 sets of 081's I have even better know.

oxrabidus

what is the max lift possible with stock springs on the 416 heads? maybe a little better springs than stock, would there be any valve guide interference up to say .48 lift?
thank you!

tshack

Nicely done thats some great info for us 305 ubusers

BC GTA

I can’t say for sure about 416 heads with stock springs. I have asked Summit Racing and Comp Cams about using higher ratio rocker arms with my heads and cam which produce .48 Intake and .488 Exhaust lift and both sources indicated than would exceed the maximum lift for my heads. If you can’t find an answer here you may want to approach those two sources for the 14014416 heads.

Since I wrote that post there is another head for our 305 engines, the Vortec head discussed in this thread.

https://www.thirdgen.org/forums/tpi/...tec-heads.html

I see there has been flow data on the 416 heads found here.

https://www.thirdgen.org/forums/tech...6-airflow.html

Good to keep all 305 head information in one place.

oxrabidus

i figured as much with stock springs, but i am going to get a set of summit springs that have a max lift of .55", i was just wondering that if like the Vortec heads (which i have a set for the future hehe...) they would hit the guides at .45" or so...

BC GTA

I am sure Summit Racing would be only to happy to answer that question for you.

oxrabidus

do you not know if i will be fine with the springs? i just want to make sure before i get the 1.6 rockers with my stock cam...

3rd-gen's 4life

"New member" But is there any issue's on the listed trick flow heads above as far as bigger valves hitting my pistons etc....looking for a good set of heads for my 91 Z28 LB9 305 TPI. I am a newbie when it comes to knowing pro's & cons but really want to keep my 305 for now...Thanks for any and all help in this area!!! and I might add want to keep all emissions!!!