building a 351

Alex89GT · 06-09-2003, 07:40 PM

what are the best flowing factory heads for a 351W?

82 GT · 06-09-2003, 09:39 PM

1969 351w 4bbl heads are the best factory heads. They are pretty tough to find though.
Why do you want factory heads and not aftermarket?
You could also port & polish stock 351w heads and have larger valves installed for half the price of aluminum heads and flow better than '69 351w heads.
My stock 351w heads are at the shop, as we speak, getting 2.02/1.60 valves installed and also ported & polished.
It's going to cost me about $550-600

Barry Jackson · 06-10-2003, 08:14 AM

I am running similar set up to yours, however with 750 carb. My heads are suppose to be 351W with 3 angle valve job, w/ 180-154 valves. Will you have to notch your pistons with 2.02 valves? I am interested to hear how they work out for you.
Also, thinking of a set of 165 AFR's but they are pricy.
Thanks,

Stang_ROTY · 06-10-2003, 11:24 AM

I have a set of those heads. My block came out of a 69 Cougar with a 4bbl. I didn't realize that they were that good a head. For the $$ I spent on the Edlebrock's I could of had them ported and polished. Oh well :-(

Quote:

Originally posted by 82 GT
1969 351w 4bbl heads are the best factory heads. They are pretty tough to find though.
Why do you want factory heads and not aftermarket?
You could also port & polish stock 351w heads and have larger valves installed for half the price of aluminum heads and flow better than '69 351w heads.
My stock 351w heads are at the shop, as we speak, getting 2.02/1.60 valves installed and also ported & polished.
It's going to cost me about $550-600

82 GT · 06-10-2003, 02:30 PM

Quote:

Originally posted by Barry Jackson
I am running similar set up to yours, however with 750 carb. My heads are suppose to be 351W with 3 angle valve job, w/ 180-154 valves. Will you have to notch your pistons with 2.02 valves? I am interested to hear how they work out for you.
Also, thinking of a set of 165 AFR's but they are pricy.
Thanks,

I'm thinking that I'm going to have to have them notched now since I went with 2.02/1.60 valves. It probably would have been really close even without the larger valves. Any clearance I would of had is probably going to be gone now so I 'm just expecting to need my pistons cut. I'll let you know for sure when I start putting everything together. I'm just waiting for my heads to come back.

82 GT · 06-10-2003, 02:49 PM

Quote:

Originally posted by Stang_ROTY
I have a set of those heads. My block came out of a 69 Cougar with a 4bbl. I didn't realize that they were that good a head. For the $$ I spent on the Edlebrock's I could of had them ported and polished. Oh well :-(

If you have the edelbrock Performer heads, then you might be right. According to my chart I have here, the Performer head flows 223cfm@ .500 lift. Ported '69 351w 4bbl heads flow 221 cfm@ .500 lift.
You are saving a lot of weight off the front end by having aluminum heads however.

06-09-2003, 07:40 PM	#1
Alex89GT Registered Member Join Date: May 2000 Location: edmonton Posts: 24	building a 351 what are the best flowing factory heads for a 351W? __________________ 306,9.5:1 comp., home made cooled RamAir,65mm TB,73mm MAF, MSD 6AL,Eibach progressives, KYB shocks, no front swaybar, 1-5/8 Flowtec headers, 2-chamber flowmasters w/turndowns, upper/lower Cobra intake (port matched),stock home ported heads,CenterForce2,SVO Aluminum Driveshaft,14.275 at 98 mph shifting @ 4700rpm

06-09-2003, 09:39 PM	#2
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	1969 351w 4bbl heads are the best factory heads. They are pretty tough to find though. Why do you want factory heads and not aftermarket? You could also port & polish stock 351w heads and have larger valves installed for half the price of aluminum heads and flow better than '69 351w heads. My stock 351w heads are at the shop, as we speak, getting 2.02/1.60 valves installed and also ported & polished. It's going to cost me about $550-600 __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

06-10-2003, 08:14 AM	#3
Barry Jackson Registered Member Join Date: Oct 1998 Location: Pitts. Pa. USA Posts: 61	82GT I am running similar set up to yours, however with 750 carb. My heads are suppose to be 351W with 3 angle valve job, w/ 180-154 valves. Will you have to notch your pistons with 2.02 valves? I am interested to hear how they work out for you. Also, thinking of a set of 165 AFR's but they are pricy. Thanks, __________________ 87 LX, 74 351W, performer plus intake, holley 750, vac sec., 78 prim. 80 sec., 50 pump: Wolverine cam 292-512, windsor heads, ported 3 angle valve, 4:10 rear, AOD, Lentech valve body w/ 10'' converter. No time slips yet!

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