2-bolt main to 4-bolt main
Thread Starter
Instructor
Joined: Jun 2013
Posts: 107
Likes: 0
2-bolt main to 4-bolt main
i have an 86 l98 2 bolt and was wondering could i swap it over to 4 bolt main block to stroke it out. and if i can how this affect any of my gauges i dont think it would but i would like to know forsure
Melting Slicks
Joined: Mar 2008
Posts: 3,022
Likes: 3
From: Chandler Arizona
The factory 4-bolt is a nice alternative to a 2-bolt when you're seeking more strength without the added cost of machining a 2-bolt to accept splayed 4-bolt main caps. *also, GM did make slight changes to the blocks during production. The most significant being the roller cam in the mid-80's, 2- piece or 1-piece rear main seals, sensor locations, certain mounting holes (some threaded, some blank, etc.). Communicate with your machine shop when deciding on a block to build on.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
For a mild to medium build up to around 450 hp there really is no need to buy a new 4 bolt block.. My friend Pete K ran a 383 using a 2 bolt block for years at the track without problems.. He had well over 400 hp...
..High rpms are what do a motor the most harm , not the hp....WW
..High rpms are what do a motor the most harm , not the hp....WW
Last edited by WW7; Sep 9, 2013 at 01:43 PM.
Thread Starter
Instructor
Joined: Jun 2013
Posts: 107
Likes: 0
droped my keyborad but yeah i like to do a 383 but everyone been tell me it wound work in the 2 bolt. would i use the same kit as a 4 bolt of do they make 2 bolt 383 kits and if so where can i find one
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
As you have already been told by othershttp://forums.corvetteforum.com/1584857983-post11.html
I really think you are way out of your depth on this 500 Hp build , given the sort of questions you are asking.
FWIW.
The number of bolts holding the crank in to the block has no bearing on the stroker kit you choose to use
also as you have already been told ,any major auto parts supplier
Summit for instance
See
http://www.summitracing.com/search/p...ing%20assembly
Bear in mind ,this only gets you some of the required parts , there is a lot more $$ in getting a complete running engine together
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Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
I've always run 4 bolt blocks in all my toys with forged cranks. Honestly, I think a studded 2 bolt would be really close in strength without all the added cost of machine work. Of course it makes me feel good I've got the 010 casting with a new 1053 crank in my 5200 RPM peak HP engine (kind of a waste really). Put the money into a complete roller valvetrain.
Safety Car
Joined: Feb 2000
Posts: 4,564
Likes: 110
From: Austin Texas
Depends on the purpose of your build, as to which block to use. It's actually common for people to switch to a two-bolt factory block only to machine it to accept "splayed" 4-bolt main caps. This is actually stronger than a factory 4-bolt block.
The factory 4-bolt is a nice alternative to a 2-bolt when you're seeking more strength without the added cost of machining a 2-bolt to accept splayed 4-bolt main caps. *also, GM did make slight changes to the blocks during production. The most significant being the roller cam in the mid-80's, 2- piece or 1-piece rear main seals, sensor locations, certain mounting holes (some threaded, some blank, etc.). Communicate with your machine shop when deciding on a block to build on.
The factory 4-bolt is a nice alternative to a 2-bolt when you're seeking more strength without the added cost of machining a 2-bolt to accept splayed 4-bolt main caps. *also, GM did make slight changes to the blocks during production. The most significant being the roller cam in the mid-80's, 2- piece or 1-piece rear main seals, sensor locations, certain mounting holes (some threaded, some blank, etc.). Communicate with your machine shop when deciding on a block to build on.
Exactly what my machinist did with my 355 in the car now...
It was going to need an align-bore anyway...just part of the "blueprinting" process.
Thread Starter
Instructor
Joined: Jun 2013
Posts: 107
Likes: 0
ok then for a 2 bolt main then if i shoot any where from 350hp to 500hp should i really need my bolt machine for a 4 bolt of should it hold up. i wantin to get it bored and put the stroker kit in it as well as a modded lt intake on different set of head(undecided on what heads yet) along with some other small parts what prediction would you say my hp would be. i expecting around like 330 or so but i may be way off. as for headers im not sure where to keep the stock ones or a set of long tube
