You are, of course, correct...but Chebbie put the 350TPI in the IROC starting in mid-year '88 (I'm pretty sure 'bout that), and it was quite a bit quicker. As an aside, they wouldn't let you order T-Tops with that combo (or a convert)- I assume the body structure was too loose for the additional torque of the 350.

 

Doesn't the 302 have more low end then the 305?

 

just curious too see if you know the #'s for the lil V6s that could (3.8Ls in the Buick GNs)? My cousin had an 87 and an 88 in high school, and they could flat out get it...He had alot of mods to the 87 and wrecked it...not sure if everything was transferred to the 88, but both were VERY quick.

 

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wait a second silver streak, how can the 305 run the same valves and the same stroke. I thought taht the 350 was a bored 305, making for a simple way to make two displacements out fo the same production line. Bigger more would allow for bigger valves, and the head asemblies of both engines are different. You're saying that even though it had a bigger bore and different heads, it had the same valves? I guess I've never built one of either, but it seems like they would have different valve sizes. Guess I learned something new.

 

I kinda thought the valves were the same size, but the combustion chamber was a little smaller on the 305. That's because I seem to remember certain "Chevy Boys" in school saying "Yeah, so and so put a cam and some 305 heads on his 350 and it runs like a scalded dog." Unless "305 heads" is a designation, like 202 heads that some SBC folks run. I can't see someone swapping in smaller valve heads and calling it an upgrade.

 

In stock form no. The 305 is better suited then a 302 as a truck/heavy car engine because the stroke is there to get it moving. The 302 does wonders in a light car and would have been the perfect small truck engine as many who have swaped them into rangers have found out.

The major advantage a 302 has in the small cube engines is bore size. You can stick a 2.02 intake valve in a 302 head and it fits try that with a 305 and you have some major valve shrowding with anything larger then a 1.88.

 

Well the 601's and 416's (common) have 58cc (really 56cc) chambers. Pop them on a 350 which comes with 76-78cc chambers and you get quite a compression gain. On a street engine (SBC) you do not need a valve larger the 1.94 to flow to 6k. A 1.88 would limit flow but it can be replaced with a 1.94 fairly cheap. It actually does boost power quite a bit even using stock heads.

Flow is the key to any engine a Ford 302 needs to breath to make power the anemic heads that come stock stink. A chevy 305 is limited because of valve shrowding. Why do I think I keep mis spelling that word over and over. Oh well

 

Because you are! It is "shrouding".

I've got some additional questions about the Chevy heads. Since this is a Ford forum, would you mind if I p.m. you with the questions?

Thanks!

 

What exactly is valve shrouding?

 

305 heads are diferent from the 350 heads but the same. They have diferent specs but the same dimensions. Where the diference in displacement comes from is the rods. The 305s have a shorter stroke which makes them rev faster and harder. And this point makes me believe they are realy underestimated.

 

I'm not sure I follow you here.

350 heads have larger valves and larger combustion chambers. I'm not sure about runner size and config.

The rods don't affect displacement (maybe you have crankshaft stroke and rod length confused). Displacement is determined by the bore and stroke. The 350 and 305 have the same stroke 3.48". The 350 displaces more because it has a larger bore (4.00" vs. 3.74"). Are you confusing the 305 with the 327 (4.00" bore, 3.25" stroke)?

Apparently the biggest problem with the 305 is that while smaller bore gives it good low rpm torque it also makes it a poor breather which limits the "top end" power that it can produce.

 

If you superimpose the diameter of the cylinder bore onto the head then part of the valve head or heads will be outside of this circle. Thus, that portion of the valve is "shrouded" from the cylinder (Does this make sense? ).

I suppose it fouls up the air flow in the combustion chamber a wee bit.

 

Okay, I get it now. Thanks!

 

I thought I was :doh: Of course around lunh time I dont care much for double checking spelling.

If you have question about Chevy heads I might be able to assist, you can make a thread about non Ford in the General Automotive section also or you can PM me.

The runner size is slightly different casting to casting, but not too much difference. The big difference is in the chambers.