Valve lifters…solid/hydraulic/roller tappet/flat tappet?

[zrayr]

I had a toploader, & 3.00:1 gearing in my car for about 7 years. I did two things to make the combination work. First of all I had a taller first gear added to the toploader when it was being restored by David Kee. This one:

2.90 First Gear
Component Manufacturing

Secondly I added about 80 HP +/- with the addition of a vintage Paxton supercharger. You can probably get the same increase by going with aluminum heads.

Z.

[LightNFast]

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[ERA Chas]

Originally Posted by LightNFast

Sorry to state obvious, but all things equal… the iron heads will actually make more power then aluminum but the weight savings will usually overcome the difference.

They won't unless they're modified as the newer aluminum heads come-tight chambers, bigger valves and better-flowing ports. There's a lot of science in modern aluminum heads. You would need to do a lot of modifying to iron heads to approach modern TrickFlows or AFRs. And then the weight still works against them.

[LightNFast]

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[xb-60]

Originally Posted by LightNFast

Hi Chas,

That’s why I said “all things equal”…. The iron RHS heads did me proud!

Kurt - your heads are CI? Your power and torque figures are impressive, if I recall correctly? OK - so what lifters? And if I can enquire, which gearbox and what diff ratio?
Cheers,
Glen

[LightNFast]

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[xb-60]

Originally Posted by LightNFast

....Lifters - Ford Racing rollers with Keith Craft "High Rev option".....

.....I wish you the very best with your project. Keep us posted…

Kurt, are the lifters solid rollers or hydraulic rollers?

And thanks. As soon as I have something actually happening,I'll report

Cheers,
Glen