Get 370 HP from a 305?
12-14-2009, 12:37 AM
#51
Junior Member
Join Date: Nov 2009
Location: Bear Delaware
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 C1500, 84 Camaro, 87 monteSS
Engine: 4.3L,Gen1 350. 391ci & 383 LS1
Transmission: t-5,man vavle body 700r4, no trans
Axle/Gears: 3:73, 3:42, 4:10
Re: Get 370 HP from a 305?
like i said, i already had a set of 2.05's (given it was with a .060 over bore) on a 305.. they fit... i've done it, have you? but if your worried about it, go with heads that have a 2.02 valve... look, there the issue is resolved... next?
12-14-2009, 12:40 AM
#52
Supreme Member
Re: Get 370 HP from a 305?
given the 2k $ cap... i could build a 305 with more hp if i already had a running one to start with over you having to go and spend half or so of your 2k just to start with a used 350, or worse starting with a fresh one that some one else built,it would have to come apart to be inspected , given a crosshatch(if needed) , new rings and bearings... no disrespect to the builder, but i never trust some elses build job... so add a gasket set, rings, bearings, oil pump, windage tray(seeing as how your already there)and bolt set to the cost.....
and your list didnt include a good set of heads, this will make all the diff. in the world if your chasing hp... id rather have a sweet set of aftermarket heads on a 305 with the rest of the right parts to compliment them the a 350 with stock heads(even if ya spend 50 bucks on a port and polish kit and clean them up yourself)... you just limited your hp potentional with junk fact. castings.... in this case.. the 305 just beat out the 350
and your list didnt include a good set of heads, this will make all the diff. in the world if your chasing hp... id rather have a sweet set of aftermarket heads on a 305 with the rest of the right parts to compliment them the a 350 with stock heads(even if ya spend 50 bucks on a port and polish kit and clean them up yourself)... you just limited your hp potentional with junk fact. castings.... in this case.. the 305 just beat out the 350
Your perfect 305 may make more peak power, but with 215 cc runners, you'll have to rev it to hell, and it would be an insanely peaky motor with a torque curve that looks like this
______^_
not street-able, not fun to drive, not emissions friendly, not fuel efficient ect ect ect.
12-14-2009, 12:47 AM
#53
Supreme Member
Re: Get 370 HP from a 305?
no, because It's a dumb idea 215cc runners are big on a 350, but on a 305!?
the small bore decreases the efficiency of the valves, it would be counterproductive, 1.94 is as big as you should go in a 305 bore. it's like drag racing uphill in the sand.
Last edited by ericjon262; 12-14-2009 at 12:53 AM.
12-14-2009, 12:53 AM
#54
Junior Member
Join Date: Nov 2009
Location: Bear Delaware
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 C1500, 84 Camaro, 87 monteSS
Engine: 4.3L,Gen1 350. 391ci & 383 LS1
Transmission: t-5,man vavle body 700r4, no trans
Axle/Gears: 3:73, 3:42, 4:10
Re: Get 370 HP from a 305?
Vortecs junk? L98 heads junk? 113 casting junk? hell, even a set of 882's aren't that god awful. and if your even half as smart as TBI computer, you won't grab the first motor that blows under your nose. you'll check it out, oil condition coolant condition, and seeing how half of those I posted are still in cars you can drive them, see how they perform on cold starts, hot starts, idle condition ect ect ect.
Your perfect 305 may make more peak power, but with 215 cc runners, you'll have to rev it to hell, and it would be an insanely peaky motor with a torque curve that looks like this
______^_
not street-able, not fun to drive, not emissions friendly, not fuel efficient ect ect ect.
Your perfect 305 may make more peak power, but with 215 cc runners, you'll have to rev it to hell, and it would be an insanely peaky motor with a torque curve that looks like this
______^_
not street-able, not fun to drive, not emissions friendly, not fuel efficient ect ect ect.
haha.. cute tq. graph! i dont think its quite that bad though...lol
id have to agree on the not emissions friendly, or fuel efficient... but a blast to drive on the street, and very streetable... not everyone has the same idea of what a street motor is... mines pretty simple... pump gas... and if was worried about fuel milage id drive a prius and get another hobbie....
but plz... dont get me wrong... part for part..i will always agree a 350 will make more power... or a 400, 396,427, 454,502, 540, or 572... so i guess now that we think about it.. 350s are dogs also, less scrap them all!
but to the OP's topic, he would just be better off working with what he has already, for what he's tring to do with the depths of his pocket
12-14-2009, 01:04 AM
#55
Junior Member
Join Date: Nov 2009
Location: Bear Delaware
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 C1500, 84 Camaro, 87 monteSS
Engine: 4.3L,Gen1 350. 391ci & 383 LS1
Transmission: t-5,man vavle body 700r4, no trans
Axle/Gears: 3:73, 3:42, 4:10
Re: Get 370 HP from a 305?
with less than .1 inches of clearance per side, efficient? no.
no, because It's a dumb idea 215cc runners are big on a 350, but on a 305!?
the small bore decreases the efficiency of the valves, it would be counterproductive, 1.94 is as big as you should go in a 305 bore. it's like drag racing uphill in the sand.
no, because It's a dumb idea 215cc runners are big on a 350, but on a 305!?
the small bore decreases the efficiency of the valves, it would be counterproductive, 1.94 is as big as you should go in a 305 bore. it's like drag racing uphill in the sand.
and drag racing uphill in the sand?.... i think there is sanctioning bodies just for that, but ya might need to go out west a lil to find the events
this has been getting to be conversation for a diff. thread........ not what the OP was asking for....
12-24-2009, 10:35 PM
#57
Junior Member
Join Date: Nov 2009
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
Re: Get 370 HP from a 305?
I found that this article has turned into more of a pissing contest between people who all know quite a bit more than us that are just starting out. So without trying to start another pissing contest, I am looking into Aerohead Racing heads for my 86 carbed 305. I have two choices, 2.02x1.60 or 1.94x1.50 valves, which would give me more of a lower end power gain? The Maro currently has a new 650cfm Holley carb, headers with an exhaust coming after the heads, and an Edlebrok Performer intake. Thanks for any input, as this will be my next purchase, seeing as how they are only 400 complete from the site.
And yes, I do agree that building a 350 would benefit me more than building a 305, I am working with what's in there now, so I can save to build a 350 later on so please don't reply with something to that effect.
And yes, I do agree that building a 350 would benefit me more than building a 305, I am working with what's in there now, so I can save to build a 350 later on so please don't reply with something to that effect.
03-14-2010, 11:08 PM
#58
Re: Get 370 HP from a 305?
This off the subect but I have a question. I have a 89 formula that had a 305 tbi that went bad. I bought a 350 tbi out of a chevy truck and I am wondering if all the pulleys will transfer over from the 305 to the 350 with no problem. If there would be, what do I have to look for?
03-14-2010, 11:18 PM
#59
Supreme Member
Re: Get 370 HP from a 305?
This off the subect but I have a question. I have a 89 formula that had a 305 tbi that went bad. I bought a 350 tbi out of a chevy truck and I am wondering if all the pulleys will transfer over from the 305 to the 350 with no problem. If there would be, what do I have to look for?
Use the pullies off of the 305.
03-15-2010, 09:59 AM
#60
On Probation
Join Date: Oct 2008
Location: Northern Utah
Posts: 6,319
Likes: 0
Received 17 Likes
on
17 Posts
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: Get 370 HP from a 305?
GXR11, if you did a 460 hp, 410 tq, pump gas, no nitrous, no-boost 305, prove it or STFU.
Thread
Thread Starter
Forum
Replies
Last Post
