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I'm working on a 81 Firebird and there is a good size ground in the factory manual and on the car from the trans to the body .

Ferm , what's up with the PAG stuff ? Can I add 46 to a system that I think I put the 150 in ?

I have a 91 Suburban with dual AC and can say that you need to run the rear with the front on . Makes a big difference in the cooling . Sounds like I need to see if the Otube is in the condenser as when I replaced it with a new one , there was not one installed . I did put one in the " original...

FT , not up on the compound stuff . I'd like to try the ATT and see . For me , I'd try a tunnel ram with a set of 421 headers . Only have a 4911 pump and that's a good starting point . Who knows , might scatter the thing in the driveway .

I'd have to look but my heads picked up 40 and 30 cfm from porting . It's not just the heads or the cam but the whole package . I got tired of the same old BS about adding more boost to overcome the low flow numbers . Found the Crane regrind and got it . Nobody had anything anywhere . And you...

Thanks Resto , I would love to hear how everything works out . Mine is a Crane regrind with ported heads so somewhat in uncharted territory with this .

Doc , what are your thoughts on the HT-4 cam ?

That's a 14 bolt . You can tell by the pins on the top of the main caps .

Check for rust under the sensor mount . Enough rust will pull the sensor away from the ring .

And to add to what Paveltolz has said , depending on the year there is a drain tube that is bolted to the back of the block running from the upper drain hole to another hole by the oil cooler lines . I've seen the tube on the 6.5 but not on the 6.2 .

The one on the thermostat housing is for bleeding air from the cooling system .

So I did a 95 like this . Replaced the heads and put everything back together . Tightened the injector lines and cranked over . It did take some time but I was lucky in that my truck had a rebuilt pump on it and was running fine , it just blew the head gaskets . Its not hard to see a misting ...

Take all the glows out and crank it over until you see a " mist " under the hood .

So you had a few test drives and knew the differences in the cammed and noncammed truck . Personal experiences . That's good . I have seen a few parts sellers online and looked at their specs for RV or towing cams . Very close if not the same to stock specs . How did the cammed trucks feel...

Reason I ask , took a little bit of work to get my Crane installed . Didn't just " slap it in " . Why would you buy a cam without knowing the specs ?

What is a HT4 cam and do you have the specs ? Have you done a compression test ?

It would make more power if you had a manifold to match the heads .

So just to be sure , you are measuring clamping force ? Do you plan to measure elongation with respect to torque or force ?

His name is Andrew Ashwell ? This was on the Page about 10 years ago .

Those are some good numbers . My exhaust is close to yours but the intake is only in the 240 range if I remember correctly .