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Discussion Starter · #1 ·
Has anybody used Thorley headers on a small block? The ones I've seen are a tri-y design. Do they clear all the spark plugs properly.
 

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Ken
I have used Doug Thorley headers for about 5 years. On my original 72/350 they fit fine. No clearance problems. I did have to remove starter, oil filter & loosen tranny cooling lines to get them in. Also had car jacked up about 18 inches.

This summer I put in a new 300HP/350 crate motor & new motor mounts. With the new motor, the headers rubbed on the steering shaft. I don't know why. I put 2 washers between motor mount and motor and this lifted the motor/headers enough for clearance.

When I swapped motors, I had the headers ceramic coated. The chrome plating looked bad after a short time. They were model 375Y. The catalog I have in front of me now says that they will fit angle plug heads also.

Are they still making headers for auto's? I had "heard" that they were only doing trucks & RV's. Phone number in Corona Ca was 909-735-7280. Area code may have changed.

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Rick (Abilene Texas)
72 El Camino
TPI350/700r4
 

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I was looking at some tri-y's for my 67. Yes, they still make them for cars. I talked to a guy with a 350 69 Camaro & he said they fit fine & had no problems installing.

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Jay W.
In-the-works 67 Malibu
surferwagons.8m.com
 

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I realize that I don't have a small block in my 69 (427) but the Doug Thorley headers are about as perfect a fit as anyone could ask for. I have air, power steering and brakes with a 4 speed. Plenty of clearance for the spark plugs and starter. I recommend them to everyone.

[This message has been edited by LIGHTWAVE (edited 11-24-99).]
 
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