4 bolt main
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Joined: Feb 2000
Posts: 1,198
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From: Bound Brook, NJ USA
Car: 89 IROC-Z
Engine: 383
Transmission: 700R4
It has to do with the number of bolts holding each main cap in place. Four bolts are said to be stronger than two bolts but are supposedly more prone to cracking in the webbing area. The best choice these days seems to be a two bolt that is drilled out for splayed bolts which are bolts that go in diagnally as well as the two that go in straight. Hope this helps.
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Riccioli Performance Motorworks
--RPM Racing--
-Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, AFR 190 heads, MSD ignition.
-Will be installing Baer Brakes
-Will be installing full Spohn suspension in rear
-Art Carr 700R4 trans??
Attention Everyone!!! I will be changing my name on the message boards to HardcoreZ28 sometime in the near future. Just wanted to let everyone know.
------------------
Riccioli Performance Motorworks
--RPM Racing--
-Currently building first ever engine. 383 with Super Ram plenum and runners, Edelbrock lower intake, Bosch 24# injectors, AFR 190 heads, MSD ignition.
-Will be installing Baer Brakes
-Will be installing full Spohn suspension in rear
-Art Carr 700R4 trans??
Attention Everyone!!! I will be changing my name on the message boards to HardcoreZ28 sometime in the near future. Just wanted to let everyone know.
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