Can anyone help with how to identify early heads from the numbers cast on them?
How to identify early v8 heads
Started by
_torana50_
, May 10 2010 08:04 PM
6 replies to this topic
#2
yel327
-
- Members
-
- 13,754 posts
Oh My, Don't you post alot
- Joined: 10-February 08
Posted 10 May 2010 - 10:20 PM
Best way to pick early Holden V8 heads (HT/HG) is they don't have the top outer accessory hole on the end of the heads. When HQ was released this was added. From casting numbers, HT-HG start with 74. HQ, most HJ, LH and early LX start with 28. And the later red pollution heads found on a few HJ, HX, HZ, VB and late LX start with 99.
#3
_torana50_
_torana50_
-
- Guests
Posted 10 May 2010 - 10:38 PM
Thanks for the info. I have a pair of heads, one starts with 28 and the other with 74 but I can not see any difference.
#4
yel327
-
- Members
-
- 13,754 posts
Oh My, Don't you post alot
- Joined: 10-February 08
Posted 11 May 2010 - 07:13 AM
Look at the end of the head where the accessories bolt on. 74 should have 2 x holes, 28 should have 3. The 74 head shouldn't even have the boss where the 3rd hole is drilled and tapped. If the 74 head you have has the 3rd hole then possibly the casting change was introduced slightly before HQ release, however you would think the cast number would change at that time too.
#5
_torana50_
_torana50_
-
- Guests
Posted 11 May 2010 - 10:28 AM
Thanks for that. You are spot on although I notices that the 74 head has 3 holes one end and only two the other. Are these heads OK to use on the same block? (Red Motor - Q series block)Look at the end of the head where the accessories bolt on. 74 should have 2 x holes, 28 should have 3. The 74 head shouldn't even have the boss where the 3rd hole is drilled and tapped. If the 74 head you have has the 3rd hole then possibly the casting change was introduced slightly before HQ release, however you would think the cast number would change at that time too.
#6
v8xu1pete
View Garage
-
- Members
-
- 319 posts
Forum Fan
- Name:Pete
- Location:Adelaide
- Car:LJ XU1 V8 (SALAMANCA RED)
- Joined: 18-May 11
View Garage
Posted 10 December 2012 - 10:24 PM
Where do you find the casting numbers on the red 308 heads. My RH head has 3 holes at the front & my LH head has 4 holes. Does anyone know what vintage they might be.
#7
yel327
-
- Members
-
- 13,754 posts
Oh My, Don't you post alot
- Joined: 10-February 08
Posted 11 December 2012 - 07:54 AM
Under the rocker covers from memory.
1 user(s) are reading this topic
0 members, 1 guests, 0 anonymous users
