LT1-LT4 Modifications 1993-97 Gen II Small Block V8

LTX Cylinder Heads

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Old 03-21-2011, 05:56 AM
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i would have to say some of there older heads pre eliminater stuff could hit or miss but there new heads are top notch as for which is the best head im not sure and im sure there could be a battle mines better than yours unless we take them all and compair with the same motor. i personaly have afr 210cc 1101 heads and love them my next set will be the 227's i have seen le and ai heads they are beautiful too but do they flow im sure they do but dont know there numbers
Old 03-21-2011, 07:04 AM
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Originally Posted by Z8'S
I run the 4 bolt front cap from Pro Gram in my lt1. There isn't really enough material to install it correctly in a stock LT1 block, it is designed for the Bowtie blocks. But I needed all the help I could get.
Good to know. I will just go with the Howard Billet on all 5 caps.

Originally Posted by DVS LT1
I went with AFR eliminator LT4 210cc competition heads for my current setup. I think these pieces were really nice. They are being run out of the box (no mods at all), but were not bolted on right away - my builder wanted to measure the sprigs himself and re&re, and did find a little bit of crap (shavings?etc) to clean out. I bought my heads from TRE performance in CA. Good guys. They seem to move a lot of AFR product. The guys at AFR know them pretty good.

Reaper how do you plan on running 11 or 12:1 NA now and then going to a TT down the road? If you are planning for a lot of boost in the future it sounds like the heads you go with should be large chambers (65-70cc+). I guess if you found the right pistons you could bump that CR up now, but you'd have to then swap in blower pistons later. If you are going to achieve 11-12:1 CR NA with crazy dome pistons do not turn a blind eye to piston to valve clearance. The NA cam you pic would obviously factor in huge. When I was piecing my setup together I didn't even think to consider PTV clearance - I should have...
I stated this in several other post, no big deal though. I will be having custom JE pistons made for the N/A build to make somewhere between 11.1/12.1 CR, and when I go Turbo I will have a new set of custom JE pistons made to get me somewhere between 8.5.1/9.5.1 CR. When I do the Turbo build I will be refreshing the block with new bearings, pistons, and rings.

Michael
Old 03-21-2011, 07:10 AM
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Why would you bother w custom pistons and not go any higher than that? You could get more than that with a normal flat top.
Old 03-21-2011, 07:12 AM
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I am going to give AFR a call today and hopefully we can come up with the best head for my build whether it be LT 227's or SBC 235's/245's. If I need the converted I will give AI or Clayton a call to see who will convert them for me. I also need a solid roller setup with Jessel shaft's, Morel Ultra Pro Hippo's, Pushrods, and a beefy Cam. So I am hoping one of these company's will be able to help me out. Either way I will be making a decision today.

Michael
Old 03-21-2011, 07:19 AM
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If I we're going to the trouble to convert heads, they would be something more capable than out of the box AFRs...

Why not a set of Allpro 23 degree with a badass CNC job, or 15 degree CFE heads that have cracked 1,000 HP N/A on 358 cubes...

Don't limit your options, it's only money.
Old 03-21-2011, 08:07 AM
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Originally Posted by gregrob
If I we're going to the trouble to convert heads, they would be something more capable than out of the box AFRs...

Why not a set of Allpro 23 degree with a badass CNC job, or 15 degree CFE heads that have cracked 1,000 HP N/A on 358 cubes...

Don't limit your options, it's only money.
Lol good luck getting 15* CFE heads to work...you'd need custom EVERYTHING. Not very feasible, and for his goals AFR 227s will get the job done.He's not going for any NA records, the car is getting twin snails put on in the future.
Old 03-21-2011, 08:19 AM
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Originally Posted by Puck
Lol good luck getting 15* CFE heads to work...you'd need custom EVERYTHING. Not very feasible, and for his goals AFR 227s will get the job done.He's not going for any NA records, the car is getting twin snails put on in the future.
Like I said, only money
Old 03-21-2011, 09:37 AM
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Originally Posted by gregrob
Like I said, only money
Good point LOL!
Old 03-21-2011, 10:22 AM
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Yeah no records here. I am not a hardcore dragger, I only want to build a strong street setup and I don't think I need more than what has been stated. I am only shooting for 1000rwhp on the dyno but will tune it down for the street 700-800rwhp. I will however have that tune waiting on a flick of a switch if I want it. My car is a mildly used street/show car that see more highway pulls than drag pulls. No reason to go overkill on the car. I will however check out All Pro and see waht they have to offer.

Michael
Old 03-21-2011, 10:44 AM
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"Only" a G huh
Old 03-21-2011, 12:08 PM
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"Only" 1000hp? That's it? That car will act like your average Civic on the highway, and probably get similar MPG, lol. I'm willing to bet 750 to the wheels will be more than enough to deal with 97% of anything you'll run into on the street.
Old 03-21-2011, 12:10 PM
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Only 1000whp? The amount of LT1s making (or have made) that kind of power can probably be counted on one, maybe two hands.

Sounds like you're very ambitious. Hopefully you've got a deeeeeeeep wallet.
Old 03-21-2011, 01:00 PM
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Originally Posted by gregrob
"Only" a G huh
Originally Posted by 93Z2871805
"Only" 1000hp? That's it? That car will act like your average Civic on the highway, and probably get similar MPG, lol. I'm willing to bet 750 to the wheels will be more than enough to deal with 97% of anything you'll run into on the street.
Originally Posted by RamAir95TA
Only 1000whp? The amount of LT1s making (or have made) that kind of power can probably be counted on one, maybe two hands.

Sounds like you're very ambitious. Hopefully you've got a deeeeeeeep wallet.
I did kind of make it sound like it was easy to do huh. I guess I will be on one of those hands when I am done. I agree with the 750rwhp for the street, I stated that I will be running 700-800rwhp street.

I talked to All Pro a few minutes ago, seems like just the heads will be around $3,500. I have to call back tomorrow to talk to Bob and he will give me an exact quote. I may stick with AFR since the whole head and valvetrain setup will be around $4,000. My pockets are not deep enough for $4,000 in heads alone.

I am waiting on AI to give me a call back on the valvetrain and cam so I can place my order there. I also need to get ahold of JE so I can figure out a piston for the build. I will be placing a order for the crank and rods through Flatlander, main caps through Competition Products, and then some parts and hardware from Summit. I already ordered the Strange S60 for the rear end and I need to find someone for a tranny. All and all I am starting to get on the ball with this. When I get all of my parts together I will start a build thread to document everything.
Old 03-21-2011, 02:51 PM
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The fastest 6-speed LT1 is only running 200cc Ai LT1 castings with a tiney 218/218 cam along with an eagle 355 rotating assembly. No fancy parts just a well thoughtout and quality setup. 1012rwhp and 156.7mph in the 1/4 in a 3680lb car.
Old 03-21-2011, 03:17 PM
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Originally Posted by speed_demon24
The fastest 6-speed LT1 is only running 200cc Ai LT1 castings with a tiney 218/218 cam along with an eagle 355 rotating assembly. No fancy parts just a well thoughtout and quality setup. 1012rwhp and 156.7mph in the 1/4 in a 3680lb car.
Is he running turbo, charger, nitrous, or combo with two of the three. Those are damn impressive numbers. Where can I see and find out more about this car.
Old 03-21-2011, 03:25 PM
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Originally Posted by REAPER13
Is he running turbo, charger, nitrous, or combo with two of the three. Those are damn impressive numbers. Where can I see and find out more about this car.
You take a trip on Peyote, the vehicle in question is speed_demon24's spirit animal.
Old 03-21-2011, 03:48 PM
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Originally Posted by James Montigny
You take a trip on Peyote, the vehicle in question is speed_demon24's spirit animal.
Yeah no ****. He's a ******* tool anyway and should generally be ignored.
Old 03-21-2011, 04:05 PM
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Reaper please see the link to the RHS 235 heads I have for sale in my Sig below. They are along the lines of what you are looking for.
Old 03-21-2011, 04:11 PM
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Originally Posted by REAPER13
Is he running turbo, charger, nitrous, or combo with two of the three. Those are damn impressive numbers. Where can I see and find out more about this car.
88mm turbo, halfway down this page.

http://www.advancedinduction.com/AiPerfLT1.html

FI's 9 Second LT1 Street Car! - Forced Inductions has pounded the rollers with 1012rwhp & 909rwtq SAE with their PTK 88mm Turbo setup on an ordinary budget Eagle 355 rebuild. This street terror runs our 200cc ported GM lt1 castings, a 218/218 .544/.544 camshaft, 12-bolt rear end, and a D&D T56 6-speed. This is a full weight street car with 3680lb Raceweight!. With Jose @ FI's expertise it's run a best of 122mph in the 1/8th and 9.871 @ 156.74mph in the quarter! The fastest LT1 powered LT1 F-body ever! Click HERE for a timeslip of this record setting pass!
Old 03-21-2011, 07:29 PM
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FAR from the fastest 6 speed LT1...


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