4 bolt main
Overdrive Member
Joined: Aug 2006
Posts: 4,496
From: Boulder, CO
RE: 4 bolt main
ORIGINAL: z28pete
The idea was that all Corvette LT1 would get 4 bolt mains, while the F cars with LT1s would get 2 bolt mains, except that a 4 bolt would be substituted for a 2 bolt in order to keep the production line going. All LT4 engines had 4 bolt mains.
The 305 does not perform well because it is a narrow bore long stroke engine and was not designed for high output. However; the Chevy 302, which was designed as alarge bore short stroke enginewill demolish a Ford 302. Two bolt mains are generally reliable to around 450 HP, and with a properly balanced engine can be good for another 100 HP.
LS type engines have a deep skirted block and use 4 bolts under the main bearing caps, and 2 bolts from the side of the block into the main bearing caps. So they have 6 bolt mains.
Now, all you guys pull down the oil pan and count the number of bolts. Bragging rights are important.
The idea was that all Corvette LT1 would get 4 bolt mains, while the F cars with LT1s would get 2 bolt mains, except that a 4 bolt would be substituted for a 2 bolt in order to keep the production line going. All LT4 engines had 4 bolt mains.
The 305 does not perform well because it is a narrow bore long stroke engine and was not designed for high output. However; the Chevy 302, which was designed as alarge bore short stroke enginewill demolish a Ford 302. Two bolt mains are generally reliable to around 450 HP, and with a properly balanced engine can be good for another 100 HP.
LS type engines have a deep skirted block and use 4 bolts under the main bearing caps, and 2 bolts from the side of the block into the main bearing caps. So they have 6 bolt mains.
Now, all you guys pull down the oil pan and count the number of bolts. Bragging rights are important.
Now where's that socket set so I can go pull my oil pan
Tech Droid
Joined: Aug 2005
Posts: 9,215
From: North East PA
RE: 4 bolt main
ORIGINAL: SpecterGT260
how come we dont see more chevy 302s then? the ford 5.0 is a pretty stout motor when its openned up
how come we dont see more chevy 302s then? the ford 5.0 is a pretty stout motor when its openned up
3rd Gear Member
Joined: Sep 2006
Posts: 948
From: Northwestern Pa
RE: 4 bolt main
http://i99.photobucket.com/albums/l3...ationwagon.jpg I tried to get a thumbnail picture to work but I cant figure it out. This wagon had a 265 in it. The best it turned in the 1/8th was 8.3 I am told it beat the Yenko but I was too young to really remember. A friend of mine built a 283 for a pulling truck it would turn around 10,000 rpm it sounded great just didnt have the low end to be competitive. The 265 in the wagon was built it ran the K stock class but they were seriously bending the rules(2 fours didnt come factory on a wagon
) in comparison we put together a mild 350 with vortec heads in the camaro and ran a 8.23 with more potential to go. No substitute for the cubes.
Pete I have a question back to the original topic, my brother just bought a 92 vette with the lt1 he said he thought it was a 2 bolt maindoes this make sense? Its a beautiful car 35,000 original miles it is outstanding for the year and it is a 6 speed.
) in comparison we put together a mild 350 with vortec heads in the camaro and ran a 8.23 with more potential to go. No substitute for the cubes. Pete I have a question back to the original topic, my brother just bought a 92 vette with the lt1 he said he thought it was a 2 bolt maindoes this make sense? Its a beautiful car 35,000 original miles it is outstanding for the year and it is a 6 speed.
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