Horsepower rating
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Joined: Oct 2007
Posts: 82
Likes: 7
From: Lakewood Colorado
Horsepower rating
I just took my value covers off for the first time. I discovered head numbers 3917291 and solid lifters. Specs show this could be either 300hp OR 350 hp. What do I have?
Melting Slicks
Joined: Feb 2006
Posts: 3,428
Likes: 5
From: Japan
How could you tell it had solid lifters just by pulling a val(v)e cover? The solid-lifter LT1 from 1970 was rated at 375 hp, and it dropped year-to-year after that as compression ratios were lowered...
Team Owner
Joined: Sep 2006
Posts: 31,274
Likes: 4,366
From: Westminster Maryland
Hi tp,
The info I have indicates the heads with that casting number were used on 327ci 300 and 350 horsepower engines in 1968.
I believe both those engine's configurations used hydraulic lifters.
Regards,
Alan
The info I have indicates the heads with that casting number were used on 327ci 300 and 350 horsepower engines in 1968.
I believe both those engine's configurations used hydraulic lifters.
Regards,
Alan
Drifting
Joined: May 2012
Posts: 1,353
Likes: 44
From: Calgary Alberta
tp, if you do in fact have solids they would be someone's addition. There was no solid lifter small block in 1968...just two 427s, the L-71 and the L-88, had solids. The 1970-1972 LT-1 350 small block had solids and ratings of 370 (70, gross), 330 (71, gross), and 255 hp (72, net).
