lt4 heads? help!
lt4 heads? help! there is a local guy selling a set of lt4 heads. id love to buy them because the asking price is very fair. how can i tell the difference between an lt1 head and an lt4 head. i dont wanna get fuct and end up with a set of plain ol lt1 heads. thanks fellas 
TECH Regular
Joined: Apr 2007
Posts: 420
Likes: 0
From: Kempner, TX
Jake
that was my first thought jake, i was curious if any of you knew what numbers to look for. i can only assume that it dosnt say lt4 on the head itself, nothing is that simple.
I was quoting the popular LT1 vs LT4 webpage. Check this link, about halfway down:
http://www.grandsportregistry.com/lt1vslt4.htm
Both the LT1 and the LT4 Heads accomodate 7/16" studs but the LT4 has larger 7/16 rocker studs. There are some reports of early LT4's with 10mm top threads. The LT1 studs are 3/8" on top and 7/16" bottom. GM part numbers are #3921912 for 7/16" LT4 and #1255216 for 3/8" LT1.
http://www.grandsportregistry.com/lt1vslt4.htm
Both the LT1 and the LT4 Heads accomodate 7/16" studs but the LT4 has larger 7/16 rocker studs. There are some reports of early LT4's with 10mm top threads. The LT1 studs are 3/8" on top and 7/16" bottom. GM part numbers are #3921912 for 7/16" LT4 and #1255216 for 3/8" LT1.
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oddly enough i found another set that included the intake manifold and throttle body. these are even ported with some badass beehive valvesprings in them. i bit more expensive than the others 
but well worth it.
but well worth it. 
Staging Lane
Joined: Feb 2010
Posts: 73
Likes: 0
From: LI.NY
Unless you can get them really cheap, And not have to put alot of $$$ into them. Dont bother with GM heads. The aftermarket stuff out there will outflow any LT1-4 heads. Go check out AFR and TrickFlow. Match the cam, and bolt and go.
I strongly disagree. It isn't always about flow and flow only. Ported stock castings, for the money, offer the best bang for your buck with immensely impressive results.
ya sorry, the ones i just sold said LT-4 on them. Pretty clear on mine but of course that will vary. All the pistons out of my motor read LT-4 as well