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

2-bolt to 4-bolt main caps

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Old Mar 24, 2007 | 04:08 AM
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Default 2-bolt to 4-bolt main caps

I'm adding a Lunati rotating assembly(383) to my 95 Trans Am and a single or twin turbo will be behind that. I'd like to build the bottom end to hold possibly up to 650rwhp. I'd also like to convert the stock 2-bolt main to a 4-bolt splayed cap. Which caps will be strong enough? Pro Gram? I think Pro Gram only makes caps 2,3, and 4 for LT1s? If so, what sould I do about cap #1 and #5? Arp studs on 1 and 5 and leave them 2-bolt? Thanks.
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Old Mar 24, 2007 | 04:13 AM
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Using Callies splayed mains on mine, they are expensive but worth it! Milodon makes a good set as well. Definitely use 4-blt with a power adder. I don't run a power adder yet but will spray down the road, just made sense to build it right the first time.
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Old Mar 24, 2007 | 04:14 AM
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Callies is good ****.

I would run Callies or ProGram Caps if i do it again.

Tony.
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Old Mar 24, 2007 | 04:24 AM
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Where can I get Callies splayed 4 bolt caps? Do they come w/ all the caps, or just 2,3 and 4?
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Old Mar 24, 2007 | 04:27 AM
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Pretty sure the callies are just 2,3,4.

Search for Callies stuff on google, they have a distributors list on there webpage.

If you cant find it from there you can get in contact with SLED28 (Dave DiLuca) at www.cdnperf.com he will get you a great deal on the caps.

Tony.
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Old Mar 24, 2007 | 07:19 AM
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IIRC, 2.3 & 4 are the most stressed, thus the best candidates for the 4 bolt conversion. You should be fine. I suspect you won't need dual turbos for just 650 hp. on a forged 383 setup. You will need to size the turbo correctly for the larger displacement, however.
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Old Mar 24, 2007 | 09:24 AM
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I have Milodon splayed caps and they are pretty nice pieces.
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Old Mar 24, 2007 | 10:08 AM
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I run Callies and they work great. Very nice pieces.
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Callies here too
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Old Mar 24, 2007 | 01:38 PM
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ProGrams here, they only make the 2,3,4 caps in 4bolt because thats the only places on the block where you can fit the extra bolts/studs.

They DO make 'upgraded' front caps at ProGram... Callies is the only ones who makes 'upgraded' front and rear caps. Just go to Callies website, they're there.
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