Heads

[Ronbo]

Has anyone seen a substantial gain by going from the small log head to the big log head? I dont want to go through the hassle of having one milled and prepped if it isnt that big of a gain. I am running a 2bbl which, I'll probably scrap for a big 1 bbl, and headers. A cam is also a possibility. Thanks for any input!

Ron

 

[falcon fanatic]

I have the same question. It's academic since I've already started porting an M head, but I'd like to know other's experiences.

Let me ask some more questions. I'll be raising the compression to above 9:1 by milling (best target cr??). But on an otherwise stock 200, is it worth any gain to:

1. Mill the log to accept direct mounting of my weber 38? I'm concerned that such a big hole will have too low port velocity to run well at low revs.

2. install bigger exhaust valves but leave stock intake valves? I've got a header and big exhaust. I'll have the pocket ported intake and the bigger carb, but with a stock cam big intake valves seem like they'll cost me too much on the low end which is were I'll generally be.

3. Hardened seats: Most beneficial on exhaust, intake, or equally important to both?

 

[Kinky6]

I can't comment on most of this, but the hardened seats are only really needed on the exhaust valve; the incoming charge helps to cool the intake valve just enough to where seat erosion and hot spots aren't a problem.

My $0.02 worth. Kinky6.

 

[Anonymous]

I slapped a 77 head on my 67 200 - Just because it was pinging with the old head and the 77 was available. No milling and a composite gasket made for much lower compression. Despite the low compression, it feels to me like the better breathing made a small increase in power and it idles smoother and starts better. Also a better carb and exhaust manifold. It made sense to me not for the power, but for reliability and practicality. That said, I think slapping on a milled late head would definitely be worth it for the power.

 

[Anonymous]

hey

i am doing the same thing, headers, cam cam kit, head. i know alot of you may disagree with me but i looked at the stats and realized clifford is probly the best for speed and sound. I called them talked with them for about an hour their is alot of possible combinations you can do. One my friend is doing is sending his block to clifford they are zero decking it boreing it, magna flushing and making custom pistons, and putinga a aluminum head and crank all for $4500, they said this should pump out a 325 horse power at the pedal. I am going to wait on my project till june cause they should have there aluminum head out then for the Sale for motors and no blue printing is needed this head should cost from $900 to $1200 he told me this will make my falcon run like a bad out of hell. I originaly was going to buy my friends block when it was done but when he seen it and heard it he said no for sale. He raced a charger and won. i will PM you if i hear anything else about when this head will be released. i cant wait.

Ps. the charger had a Dodge 318 with a some performance parts not sure what though.

 

[Anonymous]

When I was running my ported, polished & milled 66 head (11.6:1 compression) I had awesome low and mid-range torque with the 300 ci Carter YF 1 Bbl.

I swapped it for the later style (78-80) head that was also ported, polished & milled (10:1 compression) with the before mentioned 300 ci Carter YF 1 Bbl. It didnt have very much low end but it did have pretty good midrange and a awesome top end!

As you know I then swapped to a 2 Bbl Holley (mounted directely to the log) and I'll never go back!!

In my opinion, If I was going to stay with a 1 Bbl carb and that was it, I would have stayed with the 66 head because of its better low end torque. Now I think part of that was due to the compression ratio. But that could be lowered easily enough.....

Just my opinion

Later,

Doug