I have a 305 with headers, holley projection and k&n filter system. What else can I do to add a reasonable performance gain. I was thinking HO heads, or maybe roller rockers. The nice thing about the rockers is that when I go to a 350, they will go accross. that is nice but not crucial. I thought about a cam, but since the engine is used I don't know if a cam will do much for me.
CK5
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how to add horsepower
- Thread starter zach78k5
- Start date
put a blower on it /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
Hossbaby50
3/4 ton status
Good aluminum manifold, quality exhaust system, cold air intake. Other then that I would say good ignition system. Good wires and quality parts in the distributor and good plugs.
Before I did a cam swap I would do a good set of heads. The projection probably won't like a cam unless it isn't to wild.
Harley
Before I did a cam swap I would do a good set of heads. The projection probably won't like a cam unless it isn't to wild.
Harley
84_Chevy_K10
Banned
Put a 350 in it. /forums/images/graemlins/thumb.gif
mudslinger97116
1/2 ton status
NOS.. /forums/images/graemlins/grin.gif i don't know if it will work with your projection though? i have one of the old style projection and it's only capable of like 275 horse
backcountry
1/2 ton status
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- May 27, 2004
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MSD spark box, distributor and wires will give you some gains.
A cam will do wonders, however you will need to change the lifters and timing chain/gears. This will make a bigger difference than the money spent on roller rockers by far.
A good set of heads with at least a three angle valve job, swirl polished valves with undercut stems and a little porting will also do wonders.
Depending on how many miles you have on the motor; if you perform too many mods without lower end work you will run into problems.
/forums/images/graemlins/peace.gif
A cam will do wonders, however you will need to change the lifters and timing chain/gears. This will make a bigger difference than the money spent on roller rockers by far.
A good set of heads with at least a three angle valve job, swirl polished valves with undercut stems and a little porting will also do wonders.
Depending on how many miles you have on the motor; if you perform too many mods without lower end work you will run into problems.
/forums/images/graemlins/peace.gif
tomseviltwin
1/2 ton status
502 ram jet
Muddytazz
1 ton status
add a couple more hampsters /forums/images/graemlins/dunno.gif
stallion85
1/2 ton status
I got 10 extra horsepower when I put this bad boy on. It only took me 2 minutes install time too /forums/images/graemlins/grin.gif
elacruze
1/2 ton status
Consider your requirements carefully, rpm vs. torque, etc. 305 heads on a 350 are a secret torque weapon. If I were building a 305 for a truck I'd carefully choose a cam for it-I had a 305 in my '85 GMC K15 and with high axle ratios, it didn't work well with even an RV/towing cam. It needed a torque converter change to work right. With the intake and headers already on it, I'd save the money and get a 350, or an old 400 if you can find one. The 400's are real monsters with the right stuff, and their overheating problems are mostly circle track issues. You can find them cheap if you live far enough away from the local dirt track, and I've never ever seen a 400 break anything unless it ran out of oil. They have great big bearings.
84_Chevy_K10
Banned
[ QUOTE ]
Consider your requirements carefully, rpm vs. torque, etc. 305 heads on a 350 are a secret torque weapon.
[/ QUOTE ]
Nonsense. This is a myth. 305 heads flow like crap. They won't offer a gain on any 350 at any RPM.
Consider your requirements carefully, rpm vs. torque, etc. 305 heads on a 350 are a secret torque weapon.
[/ QUOTE ]
Nonsense. This is a myth. 305 heads flow like crap. They won't offer a gain on any 350 at any RPM.
As I said, a 350 is in the future, but not immediate. maybe next summer. my drawback of the cam is that i cant put it into the 350. the MSD box, roller rockers or a torque converter would all be useful with the 350 as well i suppose. will the ignition box be worth while? should I change the ESC distributor over to HEI first?
pauly383
Daddy383
Real world what I do with my 305 for better performance , is to religiously change my oil and filters every 3000 miles , a complete tune up each year , and try to run higher octane when I can afford it . Lower gears help too , a LOT . When I had the 3.08's and 33's it actually worked OK , but going lower on the same size tire really woke it up a hell of a lot ( although I rarely get on it , lost license before , not again I'm mature now /forums/images/graemlins/ignore.gif ) . So I just reccomend easy bolt ons like you have and be happy with it until you can get a XXX size smallblock and transfer that stuff over . /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif
blazd88
1/2 ton status
vortec heads! iv built roughly 300 pair of these for Scoggin-Dickey here in Lubbock and they make a huge difference(stock or not). Look into part #8060ra. They have bigger valves,springs, cut guides, and bigger push rod holes. /forums/images/graemlins/waytogo.gif
df
Registered Member
Just dropped a GM crate 350 290 HP into an 85. Transfered most everything over. Very significant power gain for $1580.00 performance engine.
84_Chevy_K10
Banned
[ QUOTE ]
my drawback of the cam is that i cant put it into the 350.
[/ QUOTE ]
Why can't you?
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can I put 350 vortec heads on a 305?
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Absolutely.
my drawback of the cam is that i cant put it into the 350.
[/ QUOTE ]
Why can't you?
[ QUOTE ]
can I put 350 vortec heads on a 305?
[/ QUOTE ]
Absolutely.
