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Thread: iron vs aluminum headed engine
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04-16-2015, 09:08 PM #1
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iron vs aluminum headed engine
Hey my formula has a iron headed lt in it what do these dyno at stock as compared to a aluminum headed engine
Project phoenix
94 formula a4 Iron headed lt1 1.5 roller tip rockers LT headers
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04-16-2015, 09:31 PM #2
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Well unless someone put iron heads on ur lt1... that motor is out of a b-body. If im not mistaken... those were about 265@ the crank.
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04-16-2015, 09:32 PM #3
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260 hp crank 330lbft crank
2021 Charger Scat 392
1994 Firebird Formula 381 stroker - Carrying the torch! - 9.90 @ 134.3mph on a 200 shot
1994 Camaro Vert - SBE LE1 Summit 8802 Cam - The CruiserThe wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ D1SC / CPT Ultra Pro Race 4L60E/Holley Terminator EFI
10.78 @ 125mph. Shooting for 9.99 for Frank Cahall!
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04-16-2015, 11:17 PM #4
The Nitrous Outlet Junkie
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the iron heads flow better than the aluminium heads stock to stock.... but the iron heads are about 20lbs heavier each side and hold heat better (heat soak) the reason it makes less power is the cam in the b-bodies is way smaller the the f-body and corvette cam.
94 Formula "budget build" #thebeaterbird
10.177 @128.31 on a lil 250 shot
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04-17-2015, 10:00 AM #5
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And press in studs for rockers
Originally Posted by zooguy
2021 Charger Scat 392
1994 Firebird Formula 381 stroker - Carrying the torch! - 9.90 @ 134.3mph on a 200 shot
1994 Camaro Vert - SBE LE1 Summit 8802 Cam - The CruiserThe wrench/driver for LTConvert's 94 Z28- Ellwein 383/LE Trickflows/ D1SC / CPT Ultra Pro Race 4L60E/Holley Terminator EFI
10.78 @ 125mph. Shooting for 9.99 for Frank Cahall!
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04-17-2015, 10:15 AM #6
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The reason I got this motor is because when I bought the car the engine had low compression I got this engine from a running trans am and when they pulled it that's when I realized that It had iron heads
Project phoenix
94 formula a4 Iron headed lt1 1.5 roller tip rockers LT headers
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04-17-2015, 11:53 AM #7
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Ha! That motor has been around the block a few times!
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04-18-2015, 04:53 PM #8
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The flow difference is marginal between the two. I think it's like a 10 cfm advantage on the intake for the iron heads but the aluminums are inherently better because smaller chamber and screw in studs.
96Z M6, ERE-383 #60, AFR 210s, LE cam, 9", Procharger D1, ???whp
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04-19-2015, 03:22 PM #9
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Anytime I look at an iron headed lt1 I always check to make sure it says "5.7" on the back and now "4.3". I bought a baby lt1 by accident once. Fortunately the guy (after convincing him they did exist) gave me a generous portion of my money back.
Chris
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Mods: 9:1 383 LT1, Ported Trick Flow heads, D1SC Procharger, 4L80E, 3.50 9"
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