Christos

Hey guys, i e-mailed AFR about using their 180cc heads on my stock 305 TPI. This is what they said, exact quote.

"Tieh a cam and head change you could see a gain of about 60 to 75 horse
power. I would suggest the comp cam XR264HR to use eith your combination.
With headers, hi-flow, mufflers, camshaft, and heads you should get near
400 hp."

So with the heads and cam, 60 horses? my stock LB9 has 190HP (i also included that in the e-mail to them). That makes 250 HP. Now, headers, a "high-flow" (whatever that is) and a muffler, and i should get near 400HP? thats a restrictive exhaust! Does this sound right to you guys? If i did pickup their suggested parts, do you think i would get anywhere close to this amount of horsepower?

Im asking here because the HP number seems great, but kind of unlikely (at least to me). Just wondered what you guys had to say about it.

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1986 IROC Camaro
305 TPI "LB9"
3.23 gears
Doesn't know enough about cars.
AIM: jesusathome

un4givin89

My @$$ you can get all that. Did they tell you to use there product line too.

[This message has been edited by un4givin89 (edited July 20, 2001).]

Synergy

Well you shoudl know that headers, catback and high flow cats dont dont add up to 150 horsepower. I think they're just giving you a bunch of horsesh|t(no pun intended! lol). With a high performance exhaust you should see about 40 horsepower. This includes headers. But due to the restrictive exhaust on the 305 you should see about 50 probably.

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92 Z28 5.7
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Trick Flow 23° heads, Comp Cams XR270HR-10 cam, Accel intake base + ported TPI,
TES headers, Flowmaster catback, MSD ignition, #24 SVO injectors, 1LE aluminum driveshaft.

Click here to see pics of my car !

Christos

Well, why would someone representing Air Flow Research e-mail me something like that then?

Everyone here says they make good heads, i thought it really odd that they would so blatently give such a poorly written e-mail, on top of giving me a poor estimate of the possible horsepower gains.



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1986 IROC Camaro
305 TPI "LB9"
3.23 gears
Doesn't know enough about cars.
AIM: jesusathome

Sitting Bull

I think the guy meant 300hp.

Using Desktop Dyno2000 and the parts you list, it comes out to about 300hp for a 305.

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1986 Camaro Sports Coupe
T-tops, power hatch, third brake light
LG4 305 V8, "Damonized" Q-Jet 4bbl, K&N filter
Crane ignition kit, TH700R4 transmission and Derale cooler
Air conditioning, pw, pl, pb, ps, tilt wheel
Kenwood cassette, Pioneer 6x4 component front speakers
Rockford Fosgate 6x9 Punch rear speakers
Aluminum slots and Goodyear 225x60R15 Eagle HP tires

un4givin89

I don't think its even that, heh

tacoboy

I think about 300 is probably right, in a magazine I read awhile ago they did a buildup of a 4 barrel 305, and they did use that same cam, and a low restriction exhaust, and they actually even used the stock heads and got like 290 horses or so, not sure been awhile, but I think that 300 horses or so is a realistic estimate.

un4givin89

that sounds possible

Hype

Well, 400 ponies has been done with a 305, using AFR heads. CHP did this buildup, (someone here has scanned article links).

Might I add though, that the 402 HP they achieved was at *7200 RPM*.

Yes, 7200RPM.

Wow, how many dyno pulls would that last for?
I'm guessing that one only.

I'm also guessing your stock TPI isn't good to 7200 rpm, let alone the short block.

300 ponies easy.

Later,
Hype.

ws6transam

I have a similar cam in my 305: An XR262H version. With home-ported 305 heads, the car now moves through the traps at 101 MPH. That would be 285-ish horsepower. I cannot see the AFR heads offering a 115 HP boost... *maybe* 25 or 35 HP.

325 is attainable with a hot 305.

Then again, there is a Mr. Ken Dye who road races a solid roller equipped 305 that makes 380 HP on iron heads... He sometimes hangs on on this board.


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Daniel Burk
View my third-gen hobbyist performance page!
View my reader's ride!
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff., Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
Best of 14.039 at 100.82 MPH in Stanton, MI
New!Full 1LE brake upgrade! Details at website above.

Dan87IROC-Z

Well, if going from the peanut cam to the 350 cam in the 5 speed LB9s adds 30 hp, you can see more than 30 hp from that cam. And AFR heads are the best there is. But I do think that 400 hp is exaggerated. It wouldn't surprize me that a totally modded 305 could make 325 to 350 hp, but 400 hp without forced induction or NOS is pretty impossible

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, LPE High Flow TPI Baseplate, Edelbrock TES 1 5/8" Headers, Catco 3" High-Flow Catalytic Converter, Hooker 3" Aerochamber Cat-Back System, Transgo Shift Kit, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET: 14.32 @ 97.7mph
(corrected for elevation)

Yarnboy

And yet Hondas make 2.0L's that are over 200 hp stock. You can make a 500hp 5.0 if you tried. It'd just cost you

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• Red '88 IROC 305 TPI T-5 w/3.08
• Accel 300+ Ignition
• Accel 300+ Pro Sleeve Plug Wires
• AC Delco Rapid Fire Plugs
• Dual Friction Stage III Centerforce Clutch
• Energy Suspension Transmission Mount
• Flowmaster Force II 3 Chamber Cat Back Exhaust
• Gutted Airboxes
• Hypertech Stage II PROM
• Hypertech Airfoil
• Throttle Body Coolant Bypass
• Best Maryland (40 degrees) E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 mile MPH 93.91
• Best Florida (80 degrees) E/T 14.88, 60' 2.163, 1/8th mile 9.540, 1/4 mile MPH 92.74
• Best 60' 2.163(Florida)
• TPiS AFPR set to 42psi using Accel Fuel Pressure Gauge (Installed after Maryland run)
• Aluminum Driveshaft (Installed after Maryland run)

I am looking to buy Edelbrock T.E.S. headers with the y-pipe. I am also looking for a 3.42 - 3.55 posi disc rear. cheesy@fred.net is my e-mail, send a letter if you can help!

Mike-91 Formula 350

AFR is probably assuming you would be dumping the TPI if you were considering installing a set of heads with the flow of the 180's.If a 195 can easily make 525 on a 350 i'm sure a 305 could make 400.

breathment

without boost i would say its impossible, most i have ever seen with a 305 is like 330 Hp, i may be wrong

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88' GTA 350 MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass

BadSS

Seems like there was a dyno article (a few years ago) that used the 2.00 / 1.55 58cc 190 AFR heads, one of the AFR cams (around 218 duration I think), RPM intake, and 650 Holley on a flat top 305. I think the article claimed it pumped out around 390 horses in the neighborhood of 6,000. I do remember thinking that seemed a little optimistic based on my engine building experiences, but not totally unreasonable considering the head's airflow capability and the rpm range the 305 was running in.

Petes 84Z28

305 buildups---> 290, 343, and 400 hp --> http://www.hioutput.com/tech.html

Pete

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Pete's Place
HiOutput Tech Page
83 SC
originally a V6...now
210+k mile LG4/5-speed
14.891@95.54
My karma ran over my dogma

BadSS

That 400HP article was named "Deadly Lessons" for a reason. If I remember correctly it threw a rod but seems like they got the thing to break in the 12's right before it blew.

Yarnboy

Why did it take 400hp to almost get in the 12's? I don't understand..I'd like to see a 305 TPI build up..

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• Red '88 IROC 305 TPI T-5 w/3.08
• Accel 300+ Ignition
• Accel 300+ Pro Sleeve Plug Wires
• AC Delco Rapid Fire Plugs
• Dual Friction Stage III Centerforce Clutch
• Energy Suspension Transmission Mount
• Flowmaster Force II 3 Chamber Cat Back Exhaust
• Gutted Airboxes
• Hypertech Stage II PROM
• Hypertech Airfoil
• Throttle Body Coolant Bypass
• Best Maryland (40 degrees) E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 mile MPH 93.91
• Best Florida (80 degrees) E/T 14.88, 60' 2.163, 1/8th mile 9.540, 1/4 mile MPH 92.74
• Best 60' 2.163(Florida)
• TPiS AFPR set to 42psi using Accel Fuel Pressure Gauge (Installed after Maryland run)
• Aluminum Driveshaft (Installed after Maryland run)

I am looking to buy Edelbrock T.E.S. headers with the y-pipe. I am also looking for a 3.42 - 3.55 posi disc rear. cheesy@fred.net is my e-mail, send a letter if you can help!

vortech305

Forget AFR heads, im in the 400 hp range with my 305 TPI and im using L98 corvette alluminum heads

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92' camaro
New 305 block TPI conversion, Flat top pistons,Bore over .30 Forged parts all around,Edelbrock intake,ported plennum,ported corvette alluminum heads, accel cam,52mm throttle bodie, SLP runners Home aid cold air induction, Air foil,ford SVO 19lb injectors,fuel regulator,cloys timing chain, comp alluminum roller rocker arms and pushrods MSD 8.5 mm wires, bosch plattinum plugs, hypertech cap & rotor and coil, Edelbrock TES headers, free flowing catalytic converter and a 3 inch force II flowmaster exhaust system, and a 3 inch cutout,Zoom multi friction clutch, T-5 tranny,billenstien shocks&struts.
Soon to come!!!
Procharger system 12lbs o boost.
New paint job(hawaiin orchid purple)Cast alluminum ZR1 rims w/ 275 tires.
Favorite quote: "where ever u go, there u are"

Other car;
1971 plymouth Duster
Mods:340,edelbrock victor jr. intake, 650 4 barrel holley, heddman headers,40 series dual flowmasters, cold air intake,4:10 gears, just got a new paint job and cragar rims with 315 tires in the back.
:Yeah its not a chevy but damn how many 71' dusters have u seen in the streets.

CloudIROCZ28

I've got the World Torquer SR heads....without a cam with headers...and dual cats dual outs all the way back with TPI and i have 265 horse and 334 torq on the dyno and that's without a cam....I think a cam does'nt matter how big of a grind it is i would only get like 275 to 280 worth of horse.....

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1987 IROC-Z
G92, LB9 305 TPI, 3.23, Bright Red with Carmine Interior, Pioneer DEHP47DH CD deck.2 JBL DS645 4*6 (F).. 2 JBL DS965 6*9 (S).. Soon to get new 305 TPI