How is it all the sudden a 'better' head? The link in this thread to "powerheads" had a flow chart of both heads and showed higher flow on intake and exhaust for their Windsor heads vs the GT40s... Edit: I would like to remind folks that earlier in this thread I said I would not start this arguement... However, now that it has been aired, I will join the malay.
Are there 351w 4bbl heads and 2bbl heads? I've seen the 351w heads listed as 4bbl heads and 2bbl thats why I ask.. I always thought that only the cleavlands were different between the 4bbl and 2bbl.
Early W heads had a version marked "4v". They were exactly as the other 69-73, except the combustion chamber was slightly smaller. 351w cars only had a 4v option in 69. In 70, if you ordered a 351 4v, you got a Cleveland.
It may "start off" as a better head (I personally don't think it is) but once they're both ported and installed on the engine the 289 heads and the early 351W heads will make more power. Here's something to remember................ Flowbenches and dynos don't win drag races. On a lighter note.....you also don't run into the stupid spark plug problems like Scott has if you use the early heads. :evilsmile
I honestly believe that the GT40 is possibly a better head, stock vs stock... The W just has too much going for it once you take that big iron lump out of the exhaust port.
No arguement from me still & I have GT40 heads. I think somebody is confused. For max hp & racing I would do 351 heads. But for a nice upgrade I could not refuse the GT40 heads for $100.
I'd still use them for street/strip engines. If you get a good deal on the GT40's and you can afford the compression drop OR you can have them milled a bit then, by all means, use them. The point I'm trying to make is that the GT40's and GT40P heads are not the absolute, end of discussion, gods-of-iron heads that some people make them out to be.
I wouldn't worry about it Eddie. My engine model program came with several popular stock and aftermarket heads already programmed into it straight from flow bench numbers. The stock W heads model out as nothing special, but the ported W heads frequently model better than popular aftermarket heads that are in the program. In the analyzer I have modeled 408Ws that pulled 550 hp with the program's own W head specs. I know it's not real world, but I have mimicked real world engines with known dyno numbers and the program is always VERY close. Dave
What head bolts or shims do you use to put 351 heads on a 302? And what kind of rockers the 351s use? 3/8 stud mount?
Except for the larger head bolt holes, the Ws are identical to 302s of the same year... (concerning rockers and such) You can get swap head bolts that have 1/2" shoulders and 7/16" threads. OR You can get washers for 302 bolts that have a thickened shoulder on them to seat in the bolt holes. I have Edelbrock washers, but many companys make them.
