Thread: I need to know some specs for my 351 heads

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Nothing was said about roller rockers though they are a positive add on to any engine and particulaly Ford as the rail type rocker tend to cause valve guide wear with other than stock camshafts. They look nice and minimize valve stem wear, reduce operational fiction, increase Hp, can change ratio from 1.6 to 1.7, weigh less, allowing the valves to not float in extreme high rpm operation plus look nice. You probably will need taller valve covers

Studs are converted to screw in from press in to prevent pull out, particularly with a non stock canshaft and higher rpm - and they WILL pull out. They are not bigger in diameter as both are 3/8, only the threaded portion is 7/16 though you can purchase 7/16 as well but not needed on a street engine.

These are bolt down rather then stud mounted Crane 1.7's on a late 5.0, but are similar in appearance

Originally Posted by Dave Severson

A question, Dave... What years Explorer's have the GT40P's???? Could always use an extra set of Windsor heads and the weather is almost nice enough to go do a bit of junk yarding!!!! Wouldn't mind finding a set....

The 97-2000 (maybe even 01) Explorers have Gt40p's. Here a couple of pics on how to tell the difference between gt40's & gt40p's....Note, the P's also have a "P" on the corner of head.....Happy junk yarding!

of course, I'm probably a little late on this posting. I should read to the end of the thread before posting....LOL! Maybe the pics will help anyway....

Randy

Originally Posted by randyr

of course, I'm probably a little late on this posting. I should read to the end of the thread before posting....LOL! Maybe the pics will help anyway....

Randy

Geez Randy, Would I have lead him astray. Hrumff !! You must have had a hard day at the beach while the rest of the USA is suffering lousy weather.

Originally Posted by Irelands child

Geez Randy, Would I have lead him astray. Hrumff !! You must have had a hard day at the beach while the rest of the USA is suffering lousy weather.

LOL! Heck no, Dave, you wouldn't have led him astray! I just didn't see your answer when I posted mine. Let's just say we both contributed to the answer since I added some extra visuals....LOL! Must admit I swiped them from sbftech, though. They came in handy when I was looking for my GT40P's.

Actually, the weather has been LOUSY out here!!! I had to wear a long sleeve shirt last night because there was such a chill in the air. You guys just don't know how we suffer over here on the left coast!!

Originally Posted by randyr

Actually, the weather has been LOUSY out here!!! I had to wear a long sleeve shirt last night because there was such a chill in the air. You guys just don't know how we suffer over here on the left coast!!

Up to a foot of snow predicted tomorrow and Monday and you have to wear a long sleeve shirt

Hey I was porting out the exhaust side on my DOOE-c heads and I noticed the intake has 2 springs on it. One big normal one and a flat kinda skinny one inside it. Is that good or bad? and what does it do?

The flat skinny one is a harmonic damper. It stops the valve from finding a frequency where it vibrates like a tuning fork, and won't let the engine rev faster than that rpm.

is that good?

Originally Posted by zackmx

is that good?

Yes - and necessary

My 77 302 heads did not have them. Does that mean anything?

Originally Posted by zackmx

My 77 302 heads did not have them. Does that mean anything?

Different valves, springs and retainers and means nothing