Highly modded...But only a 2 bolt main.

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Jan 23, 2007 | 08:36 PM

Bullydawg

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Joined: Nov 2006

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From: Alamogordo, NM

Car: 88 Formula 350

Engine: 5.7

Transmission: T-56

Axle/Gears: 9" 3.89

Highly modded...But only a 2 bolt main.

Title sums it up. Am I going to need to worry about messing up my engine? If so, What can I do? I can't do much motor work being 16. My mods are in my sig.

Jan 23, 2007 | 08:47 PM

Apeiron

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Posts: 20,981

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From: Mercedes Norte, Heredia, Costa Rica

Car: 1984 Z28 Hardtop

Engine: 383 Carb

Transmission: 4L60

Axle/Gears: 3.54 Dana 44

Having 2 bolt mains won't make a difference in any way that you need to care about on a streetable engine.

Jan 23, 2007 | 09:04 PM

blue85305

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Joined: Jun 2005

Posts: 392

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From: dfw tx

Car: 1984 camaro

Engine: 350

Transmission: th 350

Axle/Gears: 3:42

2 bolts are good up to 400-500 hp and a good 7000 rpm before they give up. Probably not if you always hammer it but occastionally you should be fine.

2-bolt blocks with OEM main bolts are good to 400hp
2-bolt blocks with ARP main studs are good to 550hp ++High Nickel Blocks to 700hp
4-bolt blocks with OEM main bolts are good to 475hp
4-bolt blocks with ARP main studs are good to 700hp
OEM Blocks with Splayed 4-bolt main studs are good to over 950hp
Bowtie blocks with splayed 4-bolts main studs should handle over 1500+hp!

at this website: http://www.montecarloss.com/SSThunder/SBCinfo.html

Last edited by blue85305; Jan 23, 2007 at 09:08 PM.

Jan 23, 2007 | 09:07 PM

blazed

Junior Member

Joined: Dec 2005

Posts: 34

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From: Lafayette,Indiana

Car: 1986 IROC-Z

Engine: 5.0L 305ci

Transmission: 700r4, shift kit

Its gonna take a heller powerfull street engine to make a two bolt main give out. I have seen 650HP street engines running a two bolt main

Jan 23, 2007 | 09:12 PM

blue85305

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Joined: Jun 2005

Posts: 392

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From: dfw tx

Car: 1984 camaro

Engine: 350

Transmission: th 350

Axle/Gears: 3:42

also found this on there:

Engine RPM plays even a larger factor in determining safe power limits for various block/cap combos.

OEM 2-bolt blocks are good to 6000 rpm.
2-bolts with ARP studs are good to 7000 rpm.
OEM 4-bolt blocks are good to 7200 rpm.
4-bolts with ARP studs are good up to 8500 rpm.
Bowtie or OEM 4-bolt Splayed Studs and cap are good for well over 8500 rpm