Forced head swap.
Thread Starter
Team Owner
Joined: Aug 2006
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From: Columbia Missouri
The aluminum heads have a much smaller chamber, and I have flat top pistons with valve reliefs. The CR would be a bit too high for me I think after all was said and done. I want to stay around 10 so I can fuel up at a pump and not an airport.
Team Owner
Joined: Oct 2004
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From: Springfield MO
St. Jude Donor '07
With flat-top pistons, the LT1 iron head chamber might still be too small. What's the chamber size on the heads that don't want to work right?
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
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Racer
Joined: Aug 2005
Posts: 355
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From: Corona Ca
Didn't see it mentioned, but would tapping and pipe plugging be preferable to welding the extra passages closed? It's removable and would have little chance of warping the head.
On the LT1 out-put debate, I remember it being stated in a magazine (Hot Rod or Car Craft?) that the internal shortblock specs on a standard LT1 were the same, iron or aluminum head (cam, comp, etc). The major power losses in each model were marketing, insurance, and exhaust dictated. This data was released when the motors were new, and may be incorrect. Also, I have not run any part number on cams or pistons to know if in fact this is true.
The article said, however, that as the iron LT1 heads were a 2nd design, chamber and flow improvements were added that didn't make the initial design (LT1 aluminum heads). So there was more as-cast power potential in an all iron LT1 than in the initial (alum head) engines. LT4 head were something completely different.
Don't know the ultimate truth of this, but I do have a nearly complete late all iron LT1 in the garage that I just need to figure out what I wanna do with it!
Best,
Tom
On the LT1 out-put debate, I remember it being stated in a magazine (Hot Rod or Car Craft?) that the internal shortblock specs on a standard LT1 were the same, iron or aluminum head (cam, comp, etc). The major power losses in each model were marketing, insurance, and exhaust dictated. This data was released when the motors were new, and may be incorrect. Also, I have not run any part number on cams or pistons to know if in fact this is true.
The article said, however, that as the iron LT1 heads were a 2nd design, chamber and flow improvements were added that didn't make the initial design (LT1 aluminum heads). So there was more as-cast power potential in an all iron LT1 than in the initial (alum head) engines. LT4 head were something completely different.
Don't know the ultimate truth of this, but I do have a nearly complete late all iron LT1 in the garage that I just need to figure out what I wanna do with it!
Best,
Tom
Thread Starter
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Team Owner
Joined: Oct 2004
Posts: 23,831
Likes: 10
From: Springfield MO
St. Jude Donor '07
The holes in question are fan-shaped.
