Head porting questions

johnGT · October 7th, 2011, 12:21 AM

I have a 1975 Camaro LT with a crate 305ci and a TH-350 auto trans. I got the motor for free from a good buddy who wasn't going to use it. It has literally been sitting around for 15~ years. I pulled the car out of a ditch for $500 and have been working on it ever since trying to make it road ready.
Here are some pics:

I have a new carb sitting in my garage and the distributor and wires have been put in place since those pics were taken.

I want this car to be faster than my current mustang but its going to need some help. I want to port the heads and do a cam swap. I'm trying to save some money as well. Can I take the heads off and leave the head gasket that is in there on? Or will I have to replace them? I have worked on smaller motors before, but not a car motor. I want to learn on this motor since it was free so I can be prepared when I go to rebuild my mustang motor. Porting seems pretty straight forward though. Tips? Tricks? questions?

08fordgt · October 7th, 2011, 12:55 AM

If u want it to b right, Pay somebody to do it. And go buy some cheap heads from the junk yard and practice on them.

SWEET2KSTANG · October 12th, 2011, 01:51 AM

change the head gaskets. as for porting, its not something you just jump in and do. then there is what you are are planning on doing as well. most chevy factory irons form the 70's have bath tub cumbustion chambers, crappy short side, and not much in favor anywhere else either.

cleangtvert · October 12th, 2011, 11:06 AM

look up mondello performance and look for the tech articals. they also sell a awsome head porting kit. has everything you need. your going to have to do alot to make a 305 run with your mustang though. they just arent a very good platform to make real power with. i'd do a 383 stroker for the most power per dollor in a sbc. i'ts easy to get 400hp/400f#torq out of them.they make a really balanced motor.

RDY4WAR · October 12th, 2011, 01:08 PM

Keep up the good work, the car looks like it's coming along.

As said before, porting is very involved and something you should research thoroughly before getting into.

I would love to have a 3rd Gen Camaro or Firebird with a 350 small block bored over .040", ~11.5:1 compression, aluminum heads, a good cam, 750 carb, and a 150 shot.

johnGT · October 12th, 2011, 03:02 PM

Thanks for the replies guys. I'm going to get the motor running and broke in before I start any mods. I want to lay down some baseline numbers. I would like to make it an occasional daily driver but it will mainly be a strip car. I'm aware that the 305 isn't the greatest motor...but I got it for free and I'm going to run with it. I've done some research and the heads on it also went on some of the 350s in the 80s. So the heads aren't terrible. They do have a lot of slag and don't look machined well is the main reason I want them ported. The cam is also WEAK. The cam is probably the first mod I'm going to do.

I will probably get some mods done to it, be discouraged about it, sell it, and use that money to beef up my mustang...it just depends on how it treats me. Overall this car is a great learning experience. I'd rather mess up on a chevy than a ford!!!

RDY4WAR · October 12th, 2011, 04:15 PM

^Can't argue with that logic.

October 7th, 2011, 12:21 AM	#1
johnGT Regular 1995 Mustang GT vert Join Date: Jan 2011 Location: GA Posts: 499 iTrader: 0 reviews	Head porting questions I have a 1975 Camaro LT with a crate 305ci and a TH-350 auto trans. I got the motor for free from a good buddy who wasn't going to use it. It has literally been sitting around for 15~ years. I pulled the car out of a ditch for $500 and have been working on it ever since trying to make it road ready. Here are some pics: I have a new carb sitting in my garage and the distributor and wires have been put in place since those pics were taken. I want this car to be faster than my current mustang but its going to need some help. I want to port the heads and do a cam swap. I'm trying to save some money as well. Can I take the heads off and leave the head gasket that is in there on? Or will I have to replace them? I have worked on smaller motors before, but not a car motor. I want to learn on this motor since it was free so I can be prepared when I go to rebuild my mustang motor. Porting seems pretty straight forward though. Tips? Tricks? questions? __________________ 1995 Mustang GT vert: STOCK, AODE (B&M shift kit), 2.73 gears, red leather, 410,000~ miles. 2007 Mustang GT: 4.6, 5-speed, 3.55 gears, black on black. (dads car) 1975 Camaro LT: 305ci, TH-350, weiand intake, 600cfm carb, 3.42 gears.

October 7th, 2011, 12:55 AM	#2
08fordgt Regular 2008 mustang gt Join Date: Oct 2008 Location: Tampa FL, macdill AFB Posts: 391 iTrader: 0 reviews	If u want it to b right, Pay somebody to do it. And go buy some cheap heads from the junk yard and practice on them. __________________ Saleen 200 mph guages, JLT cai, steeda spacer, SCT3, bamachips, Steeda UDPs, Hurst, bbk shorties, Pypes O/R X& mufflers, Saleen front anti sway bar, Steeda blue lca, relocation brackets, edlebrock adj. uca, adj. panhard brace and bar,sportlines, cmdp

October 12th, 2011, 01:51 AM	#3
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,541 iTrader: 8 reviews	change the head gaskets. as for porting, its not something you just jump in and do. then there is what you are are planning on doing as well. most chevy factory irons form the 70's have bath tub cumbustion chambers, crappy short side, and not much in favor anywhere else either. __________________ project warhorse under construction wagon burner under construction as well (04 lightning) being built by MP2 Performance

October 12th, 2011, 01:08 PM	#5
RDY4WAR I Post Entirely Way Too Much 07 Turbo Focus 12.93 @ 105mph Join Date: Feb 2010 Location: Glen Burnie, MD Posts: 6,006 iTrader: 0 reviews	Keep up the good work, the car looks like it's coming along. As said before, porting is very involved and something you should research thoroughly before getting into. I would love to have a 3rd Gen Camaro or Firebird with a 350 small block bored over .040", ~11.5:1 compression, aluminum heads, a good cam, 750 carb, and a 150 shot. __________________ 2007 Focus - 230/215, cams/head/manifold swap done, new #s soon ...going E85! 1985 Bronco - 351W & 4WD 1986 Mustang LX - 351W build in the works! David Michael Smith, 07/25/1956 - 12/08/2011 ...R.I.P dad! I miss you dearly!

October 12th, 2011, 03:02 PM	#6
johnGT Regular 1995 Mustang GT vert Join Date: Jan 2011 Location: GA Posts: 499 iTrader: 0 reviews	Thanks for the replies guys. I'm going to get the motor running and broke in before I start any mods. I want to lay down some baseline numbers. I would like to make it an occasional daily driver but it will mainly be a strip car. I'm aware that the 305 isn't the greatest motor...but I got it for free and I'm going to run with it. I've done some research and the heads on it also went on some of the 350s in the 80s. So the heads aren't terrible. They do have a lot of slag and don't look machined well is the main reason I want them ported. The cam is also WEAK. The cam is probably the first mod I'm going to do. I will probably get some mods done to it, be discouraged about it, sell it, and use that money to beef up my mustang...it just depends on how it treats me. Overall this car is a great learning experience. I'd rather mess up on a chevy than a ford!!! __________________ 1995 Mustang GT vert: STOCK, AODE (B&M shift kit), 2.73 gears, red leather, 410,000~ miles. 2007 Mustang GT: 4.6, 5-speed, 3.55 gears, black on black. (dads car) 1975 Camaro LT: 305ci, TH-350, weiand intake, 600cfm carb, 3.42 gears.

October 12th, 2011, 11:06 AM	#4
cleangtvert Enthusiast 1991 gt vert Join Date: Oct 2010 Location: st louis Posts: 727 iTrader: 0 reviews	look up mondello performance and look for the tech articals. they also sell a awsome head porting kit. has everything you need. your going to have to do alot to make a 305 run with your mustang though. they just arent a very good platform to make real power with. i'd do a 383 stroker for the most power per dollor in a sbc. i'ts easy to get 400hp/400f#torq out of them.they make a really balanced motor.

October 12th, 2011, 04:15 PM	#7
RDY4WAR I Post Entirely Way Too Much 07 Turbo Focus 12.93 @ 105mph Join Date: Feb 2010 Location: Glen Burnie, MD Posts: 6,006 iTrader: 0 reviews	^Can't argue with that logic. __________________ 2007 Focus - 230/215, cams/head/manifold swap done, new #s soon ...going E85! 1985 Bronco - 351W & 4WD 1986 Mustang LX - 351W build in the works! David Michael Smith, 07/25/1956 - 12/08/2011 ...R.I.P dad! I miss you dearly!

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