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sorry need info on a mild build up on a 305

 
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elsanyo
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Joined: 05 May 2003
Posts: 8

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PostPosted: Fri Dec 16, 2005 3:38 pm    Post subject: sorry need info on a mild build up on a 305 Reply with quote

want to keep matching numbers so we would like to build up this 305( Not for racing just healthy street )
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Big Dave
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Joined: 04 Dec 2005
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Location: Tampa Florida
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PostPosted: Fri Dec 16, 2005 6:45 pm    Post subject: 305 Build up Reply with quote

I personally saved the 305HO out of my '89 Caprice police car which I have since replaced with a high dollar 406 for my street car. The problem with 305 engines are two fold. Small bore and bad heads.

Addressing the head issue first: because of the small bore you can not just change the heads to whatever your favorite 350 head might be, unless you first notch the block (just like Chevy does with the big block) to clear the valves. This is because of the small bore.

Small bore problem, is only a problem, if you want high performance. If you are satisfied with the performance of the 305 as designed then leave everything alone. It has a smooth idle, generates lots of torque relative to it's displacement, and as designed is relativley fuel efficient.

If you want performance start with at least a 4.00 inch bore (dime-a-dozen SBC 350 2 or 4 bolt) or go to an aftermarket 4 bolt block with a 4.125 inch bore; and order the 400SBC journals to get the big (STRONG) unbrakeable crank. (leave small journal diameters to racers who considers engines to be expendable).

If you still want to keep close to a 5.0L engine and play with somebody's head order a small journal 4.125 block with a Lunati 3.00 inch stroke crank and use a mechanical roller cam to let this beast shift at 10,000 RPM.
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Sat Dec 17, 2005 12:37 pm    Post subject: Reply with quote

What kind of car is this engine for?
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96capriceMGR
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Joined: 23 Aug 2003
Posts: 814
Location: New London Wisconsin
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1996 Chevrolet Caprice

PostPosted: Sat Dec 17, 2005 1:47 pm    Post subject: Reply with quote

Big Dave where are you getting your info on strong and weak journal sizes? The "small journal" 350/305 stuff is plenty stout there are stock bottomend 94-96 b-bodies in the 10s and that LT1 bottomend is really just a one piece rear main smallblock bottomend and nobody has crank issues, even the freakishly lightweight cars are 4000lbs with driver so there is plenty of power going though that "weak" small journal crank. 30 years ago journal size may have played a part in realized strength that is not the case today.

I would however agree that you should consider mothballing the numbers matching motor if you want any power. If you are dead set on sticking with that block then get the head ported, Edelbrock should have some nice intake choices and pick a MILD cam you will wake it up some.
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