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Need a little help with a big decision

mcreyaufmiller

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mcreyaufmiller Senior Enthusiast

mcreyaufmiller

Posted
Posted

So since I am ready to upgrade my motor, I have been talking to my engine guy. He is suggesting that I replace my 305 with a HO 305 to avoid any problems. I have been talking to people that have told me I can install a 350 wit no problem. The big question is that I need new headers. What should I install on the new motor when it goes back in to the truck? I have heard good and bad about the long tube and short tube headers. If neither are a good match then should I put the stockies back on?????

VortecMax Enthusiast

VortecMax

Posted
Posted

Go for the 350, you wont regret it one bit. It has always been one of Chevy's best motors, and theres tons of power waiting to be found in it.

  • 3 weeks later...
95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted

Totally agree with these guys. A little known fact is that the 350 and the 305 are basically the same engine externally, with things like crank throw, piston bore, and combustion chamber cc's as the main differences. If you really want to go nuts, put the 350 block in w/the 305 heads and long tube headers. Yeah, you'll have to run 93+ octane to avoid knock, but with a high compression NA motor you'd have a screamer.

Tucson_02Silverado Senior Enthusiast

Tucson_02Silverado

Posted
Posted

Ditto on going with the 350. I did that when the 305 LG4 block crack in my 83 Caprice wagon. They are both SBC Gen I blocks, so just about everything transfers between them. There is a version 2 of the Gen I block, 1986 and above, the change is a one piece rear main, there's conversion kits to use the 2 piece with the one piece, and still most other stuff will just bolt up as well. Then theres the Vortec heads (?? L31 ?? i think, do a search) have different intake manifold bolt pattern/placement, but again most other stuff is a direct transfer bolt on.

 

It's been a while, but I think it's still the Gen I block (one piece rear main) with the Vortec (?? L31 ??) heads and a nice dual-plane "carb" intake with Vortec bolt pattern, mild 224 cam making a very nice daily-driver 'once-in-a-while-stomping' engine. Not required, but do try to convert from the mechanical pump to a nice electric pump.

 

I've been making the assumptions that you currently are carb'd.

OnyxMAX Enthusiast

OnyxMAX

Posted
Posted

prolly the 70, only hard SB to get carb parts for is the LTx series theirs like one spreadbore we can find but my bro spet big bucks on his square bore and doesn't wanna give it up.

 

most TBI engines you can find anykind of minfold for.

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