How much would it probably cost to have my stcok heads ported and polished. And where would be somewhere that this could be done at. Also about how much HP gain would I be looking at with my 305?

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87 C-10
305 TBI
(yeah I know its a truck, but you are the best TBI guys I have found)
Performance
**Somewhere around a 16.8 @ 85 ish (G-Tech)
*Freshly rebuilt 305 bored +0.030 over (311)
*K&N Airfilter
*Homemade Ramair w/ modified intake
*180 thermostat
*Custom True dual exhaust(Flowmaster 40's)No Cat's
*TD Performance TBI Spacer
*Mobil 1 10-w30
*Redline Water Wetter
**(alot more done, but I don't feel like boring everybody)

 

BigRed,

Unless you are going to do the machining yourself, the cost would be prohibitive. You would be better off purchasing a set of 305 Torquer heads with the enlarged valves and proper springs. Paying someone else to rework your stock heads will be expensive and probably disappointing unless you spend a LOT of cash for someone who has some talent. Just enlarging the valvesm spring seats, and bowl porting the heads will likely take $400.00 out of your wallet. And you still have small port runner sizes with poor flow at the transition areas. To properly port stock heads, you'll likely have to machine through the castings, weld, and machine again. If you don't get good weld to the cast iron, you'll be pulling them again to repair them. Then balancing all the runner volumes and maintaining the correct shape through the runners and bowls can be time consuming. If you're going that far, you should match the chamber volumes and at least surface grind the heads to a flat plane. Ny this time, you will have spent twice the cost of aftermarket heads.

Of course, if you want something better than aftermarket heads, you pay the price and do the work.

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

just pocket port and polish them up yourself. Practice on some junk heads first.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Soon to be installed:
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz

 

I dunno. I've heard that do-it-yourself p&p's can really hurt the hp. I'm pretty sure you'd need to get everything just so. Wiuh a dremel and a six pack, your odds are pretty small for lucking out.
I recommend aftermarket or vortecs.

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No guts, no glory.

 

Well thanks for the help I was just going to ask, to see about the price difference between having my stock heads tweaked with a set of vortecs.

------------------
87 C-10
305 TBI
(yeah I know its a truck, but you are the best TBI guys I have found)
Performance
**Somewhere around a 16.8 @ 85 ish (G-Tech)
*Freshly rebuilt 305 bored +0.030 over (311)
*K&N Airfilter
*350 TB unit W/ultimate Mods (going on soon)
*Homemade Ramair w/ modified intake
*180 thermostat
*Custom True dual exhaust(Flowmaster 40's)No Cat's
*TD Performance TBI Spacer
*Mobil 1 10-w30
**(alot more done, but I don't feel like boring everybody)

 

TBI 305 heads are swirl port heads and really can't be ported economically to improve airflow much due to the restrictive castings. Go w/ the Vortecs or Torquer's, you'll be glad you did.

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82 Z28 383, Ported 215cc Dart Iron Eagle Heads 72 cc Comb. Chambers, Comp custom grind Hyd roller cam, Speed Pro .250" domes, Wheeler Motorsports 4340 I beam rods, Eagle 5140 steel crank, Weiand Team G intake, Holley 830 DP, hedman headers
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET:11.60 @ 114.56, w/ a 7.34 1/8 @ 93.50, and a 1.622 60'


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock

Bassett Racing