4 Bolt converstion kit advise....

[The yob]

Hi all

Im after abit of advise is poss, I want to convert my 2 bolt mains block to 4 bolt(SBC), I understand you can purchase 4 bolt main cap conversion kits from the likes of real steel, Does anyone have any experience of fitting these? Can anyone recommend a company who could convert my block for me? any idea on cost, all advise gratefully appreciated

Thanks

Mat

[Boosted LS1]

There's quite a lot of work involved to do this properly. A 4 bolt block would probably be cheaper especially now the dollars weak.

[Time Machine]

Boosted LS1 said:

There's quite a lot of work involved to do this properly. A 4 bolt block would probably be cheaper especially now the dollars weak.

I'd agree with this - you need to get the mating surfaces milled and then line bore it to put the crank back in alignment - if you don't do this step properly you will be chasing problems forever.

[Tet]

Just curious... what are you hoping to achieve by converting to 4-bolt mains?

[The yob]

Hi all

thanks for your swift replies!, The reason im doing it is due to the fact im building a blown methanol blown injected small block, I don't think the 2 bolt mains will be up to it? What's peoples thoughts?

Thanks for your time

Mat

[The yob]

Thanks for the reply, Ive been looking at trying to import a 4 bolt mains from the states, does anyone know of any companys out there that would ship to the uk? so i can "cut out the middle man" !

Cheers

[MotorPsycho]

http://www.competitionproducts.com/ do one and they are fantastic to deal with, very helpful

the kit itself is pretty cheap, but the associated machine work to the block then subsequent align-boring of the journals will run into four figures

[KP1]

www.summitracing.com
www.jegs.com
With a blown methanol combination I should go with the best block I could afford. Same with the crank.

[The yob]

hmmmm...looks like the girlfriend isnt getting that new kitchen for xmas!......anyone wanna buy a good 2 bolt block!

[The yob]

its being chromed as we speak!

[Nitrohaulic]

I was initially interested in an iron 4 bolt main big block for our nostalgia funny car and a couple of old timers warned me about a tendency for the rear main journal to rip out upwards of 1,500 horsepower or so. I now have a Rodeck because of a great deal I got on it and it has a large reinforcing rib that runs from the rear main up to the rear cam journal. If I get the right opportunity, I'll still upgrade to something cross bolted like a KB Olds or Arias, as the Rodecks have a tendency to crack along the oil journal that runs from the main journals to the cam journals. Would rather sell this one while it's still a block instead of after one crack makes it scrap aluminum.

I remember reading on Spud Miller's nitro notes section of his website about splitting an iron small block main cap on 50% nitro. Four bolts in line with each on a stock block are definitely not the end all.

http://www.fuelinjectionenterprises.com/

edit. It'd been a while since I read that page on his site. I now see that it was two main caps he split in two. You'll see links to pics of them in the "How Risky Is It?" section. I'll bet the bottom end issues he's had with his nitro injected small block would relate to a blown alcohol small block. Good reading.

Edited by Nitrohaulic on Thursday 20th December 23:43