Thread: advice for a 305

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I'm looking for some advice with a 305 that has HEI on it. I bought my 72 Cheyanne 1/2 long box with factory air and completed the body repair (new cab corners, rockers and fenderwells/dog houses all around) and the paint/trim.

The trucks history: was taken off the road in 95 for a restore project between the guy I bought the truck and his kid. I got the truck in 2003 and have been nailing out the body work and I'm having some trouble with the engine.

I have dual exhaust witht he stock manifolds with the only change I've done is replace the rochester 4bbl with a 600cfm edelbrock.

The engine is smokeing a great deal and it backfires pretty often as if the valves did corrode and such since it was sitting for so long with out being ran.

I was evaluating my options for either yanking this 305 and getting myself a real 350 (I thought that's what the engine was when I bought it till one of my dad's buddies ran the numbers on the engine and said it was a 305).

I know the 305 and the 350 shared the same block but was wondering what the difference was, bigger cylender bore and different stroke?

What kinds of things could I do to this 305 to make it worth while, something like putting on an edelbrock performer intake manifold, getting some headers. Maybe some 350 heads or something?

Financially I almost have to go the route of yanking the heads and getting them milled/rebuilt for around 300 to start, but wondered what would happen if I stick 350 heads on it.

From what I've been reading I should get myself the edelbrock performer intake and eventually some headers and I'll get high teens low 20s for gas mileage.

Any advice is welcome! and thanks in advance.

Best advice i can give, Get yourself a 350 rebuild it yank the 305 salvage what you can off of the block and give it to the junkman.

Originally posted by BLOWN 502 MONTE
Best advice i can give, Get yourself a 350 rebuild it yank the 305 salvage what you can off of the block and give it to the junkman.

I mentioned above about reading around and finding some info on tweakin a 305, here's the meat of what i read:

http://www.jalopyjournal.com/forum/a...hp/t-1494.html

I'm not really looking for something super strong or super fast, just something that sounds mean (my dual exhaust with glass packs currently cover that), and is responsive enough with decent gas mileage.

72 Cheyenne, this topic has been gone over plenty of times, do a quick search here, youll find info.

http://www.goingfaster.com/spo/325_h...chevrolet.html

http://www.hioutput.com/tech/343hp/343hp.html

Originally posted by stepside454
72 Cheyenne, this topic has been gone over plenty of times, do a quick search here, youll find info.

Thanks, None of my searches gave me any results. I guess I was useing the wrong keywords.

A link to any of the discussions that you recently remember would be a great help!

Originally posted by techinspector1
http://www.goingfaster.com/spo/325_h...chevrolet.html

http://www.hioutput.com/tech/343hp/343hp.html

Thanks for the info, those both read really nice!

I'd hate to have to yank the 305 out of the truck for a 350 if I can just get by with a head job and a new manifold for now then get the cam and the headers later.

This is a second toy truck and will only haul stuff on an extremely rare basis and just a couch or tv or something at that.

my best advice is the same as everyone at this point, bud ditch the 305 and find a 350 even think crate engine maybe, thats what i am doing my self with a 77 fleetside..

And maybe after two and a half years, the solution has already been found.

Originally Posted by chevythunder

my best advice is the same as everyone at this point, bud ditch the 305 and find a 350 even think crate engine maybe, thats what i am doing my self with a 77 fleetside..

I have to agree; you can get a Goodwrench 350 brand new, not rebuilt, for about $1300.00 with 260 horsepower and a 3 year 36,000 mile warrenty straight from GM. You cant even do a basic rebuild for that anymore once you figure in machine work, plus a good warrenty is a nice plus.

Originally Posted by nitrowarrior

And maybe after two and a half years, the solution has already been found.

Indeed

Originally Posted by kitz

Indeed

I guess better late than never.