The 1947 - Present Chevrolet & GMC Truck Message Board Network

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The 1947 - Present Chevrolet & GMC Truck Message Board Network (https://67-72chevytrucks.com/vboard/index.php)

- Engine & Drivetrain (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=24)

- - New Double Hump Heads (https://67-72chevytrucks.com/vboard/showthread.php?t=803900)

SmirchIs#1

04-13-2020 07:54 PM

Re: New Double Hump Heads

Quote:

Originally Posted by Tom (Post 8712968)

You're contradicting yourself. The added heat retention of the iron head is why you have to run lower compression vs the aluminum to avoid detonation. By upping the compression on the aluminum head the same overall heat values are maintained and power goes up. If iron heads were the way to go then they would run them OEM. They haven't since what, 2000 in the vans?

You're entitled to your opinion,I say bull.You may regain the loss over cast heads,but you will not surpass it.Boy they do look pretty though.

SunSoaked

04-13-2020 11:12 PM

Re: New Double Hump Heads

Engine Masters has an episode specifically on this topic. Dyno numbers don't lie. The only hint I'll offer is "horsepower costs money."

mattfranklin

04-20-2020 03:14 PM

Re: New Double Hump Heads

When I put my '70 LT-1 clone together these were not yet available.
I wasn't actually concerned about date code matching, I just wanted functional compatibility so a graybeard would hear the rumble and mechanical valve clatter and be taken back to the old times. And I wanted "the look." It was hard to find good vintage cores, but my machinist came through with good cores and did some excellent work. I'm very happy with the results.

However, if these were available I would have probably gone with them and saved a few bucks. If I do another classic motor I'd probably go with these. But the LS motors are so tempting.

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