305 vortec heads on a 350
12-10-2012, 10:27 PM
#1
Junior Member
Thread Starter
Join Date: Sep 2012
Location: Tulsa oklahoma
Posts: 25
Received 0 Likes
on
0 Posts
Car: 1983 trans am
Axle/Gears: 4 wheel disc 3.23
305 vortec heads on a 350
i have a motor with the 305 vortec heads on a 4 bolt main 350 carb setup and for some reason there are roller rockers and 3 regular rockers so i need to buy a new set and i dont know what i need to buy and also i read that with those heads it will be to much compression to run pump gas? is this true cuz i want this to be something i can run pump gas in???
12-11-2012, 01:29 AM
#2
Supreme Member
Join Date: Jul 2007
Location: Howard Lake, MN
Posts: 1,293
Likes: 0
Received 4 Likes
on
4 Posts
Car: 86 Camaro
Engine: 355- hopefully a 5.3 this summer
Transmission: 700r4
Axle/Gears: 3.42
Re: 305 vortec heads on a 350
what are the head casting numbers?
people have been running 305 heads on 350's since they came out in the 70's and doing just fine on pump gas.
people have been running 305 heads on 350's since they came out in the 70's and doing just fine on pump gas.
12-11-2012, 09:50 PM
#4
Member
iTrader: (1)
Join Date: May 2012
Location: Cave City Ar.
Posts: 358
Likes: 0
Received 0 Likes
on
0 Posts
Car: 85 T/A
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: 305 vortec heads on a 350
Those vortec 305 heads aren't true vortec heads like the 906 and 062. They use the same intake, but inside they're not much better than a standard ole 305 head. I'm sure they flow somewhat better, but they dnt have the kidney shaped chamber like the 906 and 062. I may be wrong here, but I believe they're 58CC. The roller rockers you buy will need to be self aligning unless you have guide plates. If you use regular rockers and the engine has a roller cam you'll need those to be self aligning too unless you have guide plates.
12-11-2012, 11:00 PM
#5
Junior Member
Thread Starter
Join Date: Sep 2012
Location: Tulsa oklahoma
Posts: 25
Received 0 Likes
on
0 Posts
Car: 1983 trans am
Axle/Gears: 4 wheel disc 3.23
Re: 305 vortec heads on a 350
alright well can i run pump gas? what ratio of rollers do i need 1.5 or 1.6 and what studs 3/8 or 7/16.. and also the head gasket? does it need to be a particular size
12-12-2012, 06:23 AM
#6
Member
iTrader: (1)
Join Date: May 2012
Location: Cave City Ar.
Posts: 358
Likes: 0
Received 0 Likes
on
0 Posts
Car: 85 T/A
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 3.27
Re: 305 vortec heads on a 350
The comp ratio is gonna depend on what pistons are in it, if they are factory pistons you can run pump gas as long as your not too aggressive w the timing, any pistons w a higher comp ratio than factory you probably won't be able to. The rocker ratio is 1.5 factory, you can run 1.6 as long as your not over .475 lift so that's all gonna depend on what cam you have. The head gasket needs to be for a 350.
12-26-2012, 12:12 AM
#7
Junior Member
Thread Starter
Join Date: Sep 2012
Location: Tulsa oklahoma
Posts: 25
Received 0 Likes
on
0 Posts
Car: 1983 trans am
Axle/Gears: 4 wheel disc 3.23
Re: 305 vortec heads on a 350
Alright I'll try to get some 1.5 roller rockers, any websites you know that are fairly priced an what thickness of a head gasket do I need
Trending Topics
12-26-2012, 12:57 AM
#8
Supreme Member
Join Date: Jul 2011
Posts: 2,529
Likes: 0
Received 0 Likes
on
0 Posts
Re: 305 vortec heads on a 350
OMG.!!!. Big boy pants time. Haft of a a** is still haft a**ed.
Your choices are very clear.Either you buy the aftermarket heads you need to have or
GO BOWLING.WALK AWAY FROM ALL OF THIS.A BALL AND SHOES IS CHEAPER!!!.
Your choices are very clear.Either you buy the aftermarket heads you need to have or
GO BOWLING.WALK AWAY FROM ALL OF THIS.A BALL AND SHOES IS CHEAPER!!!.
Thread
Thread Starter
Forum
Replies
Last Post
84z96L31vortec
Tech / General Engine
7
08-20-2017 12:16 AM
84z96L31vortec
North East Region
1
08-10-2015 08:27 PM
