L31: Flat or Roller Tappets from GM?

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Jun 13, 2006 | 10:40 AM

#21

Slalom4me

Thread Starter

Le Mans Master

Joined: Jan 2002

Posts: 9,036

Likes: 13

From: Edmonton AB

Quote:

Originally Posted by Slalom4me

Bottom line, if I had some, I'd use
them - if I was looking for used Vortecs, I'd prefer the 062
but still look at the 906. If I was buying new, I'd chose the 062.

.

Understand that this remark is made based on what I currently
know after reading information from other people.

I do not have first hand experience with either head.

If the application was really important, I'd buy both to examine,
test and decide for myself..

.

Last edited by Slalom4me; Oct 15, 2006 at 11:55 AM.

Aug 4, 2006 | 01:15 PM

#22

Slalom4me

Thread Starter

Le Mans Master

Joined: Jan 2002

Posts: 9,036

Likes: 13

From: Edmonton AB

Since we are talking about Vortec heads, I'll add information here
that I compiled for a different thread so it can be found together
with the other L31 Vortec material that already appears above.

Quote:

Originally Posted by opel

I'm not sure what the CFM is on the stock Vortec heads
I can't find any solid info on them.

Quote:

Originally Posted by Slalom4me

0.200". - 0.300". - 0.400". - 0.500".

129/101. 186/136 . 219/149 . 216/155 CHP Vortec Test
135/103. 192/140 . 223/159 . 231/170 (Lightly ported)

114/088. 173/125 . 216/143 . 225/149 Stan Weiss Collection

123/100. 174/139 . 212/153 . 210/160 CHP Test

139/101. 190/121 . 227/140 . 239/147 CHP Flow Database

If you set aside the mildly ported values and the last results,
the rest of the stock numbers seem pretty close to each other.

Aug 27, 2006 | 04:11 PM

#23

Slalom4me

Thread Starter

Le Mans Master

Joined: Jan 2002

Posts: 9,036

Likes: 13

From: Edmonton AB

Yet more Vortec flow numbers, and some others as food
for thought.

Notice the Trick Flow 23º 175 heads - an apparent
bolt-on replacement for D113's. Thanks, tequilaboy.

0.200". - 0.300". - 0.400". - 0.500".

122/096. 177/124 . 217/147 . 229/166. - 165cc (Edelbrock Performer Corvette #60879 w/60cc 2.02/1.60 valves)
139/105. 190/137 . 227/151 . 239/160. - 170cc (885 Iron Vortec w/ 64cc & 1.94/1.50)
125/094. 177/123 . 220/144 . 254/155. - 181cc (AFR 180 w/ 68cc & 2.02/1.60)
144/121. 208/157 . 244/188 . 262/202. - 191cc (AFR 190 w/ 76cc & 2.02/1.60)
141/107. 201/143 . 247/175 . 258/190. - 195cc (Canfield w/ 67cc & 2.02/1.60)
140/118. 197/153 . 240/183 . 271/200. - 215cc (AFR 210 w/ 67cc & 2.08/1.60

120/096. 160/123 . 186/140 . 196/155. - 163cc (L98 TPI w/58cc & 1.94/1.50)
126/104. 177/138 . 215/160 . 240/180. - 170cc (Edelbrock E-Tec 170 w/ 64cc & 1.94/1.55)
127/109. 180/142 . 219/167 . 242/181. - 175cc (Trick Flow 23º 175 w/ 56cc & 1.94/1.50)
129/108. 195/156 . 240/178 . 255/190. - 180cc (AFR 180 Eliminator w/68cc & 2.02/1.60)

Oct 27, 2022 | 05:45 PM

#24

97 Chevy

2nd Gear

Joined: Oct 2022

Posts: 2

Likes: 0

Looking for the overall length of push rod end to end

Oct 27, 2022 | 06:45 PM

#25

Tom400CFI

Team Owner

Joined: Aug 2004

Posts: 21,543

Likes: 3,216

From: Park City Utah

I think they're standard SBC...what is that? 7.200"? Plus/minus GM slop?

This here thread is 16 years old., FYI.

Oct 28, 2022 | 01:37 PM

#26

97 Chevy

2nd Gear

Joined: Oct 2022

Posts: 2

Likes: 0

Quote:

Originally Posted by Tom400CFI

I think they're standard SBC...what is that? 7.200"? Plus/minus GM slop?

This here thread is 16 years old., FYI.

trying to figure how chevrolet measures their push rods. GM #10241740 push rods specs show overall length as 7.122 but using a caliper actuall end to end is 7.195

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