can any of you fellows give me the torque specs for a Neil jern chev head conversion? (I lost my instruction sheet!) drat!
merry Christmas to all
I would think the limiting factor is the torque the block can withstand. About 50 lb-ft is what most recommend for head torque. Most important is to use a good sequence and have all evenly torqued.
Like John said.
Is the question about the plate to head or the head to plate torque? Or both? If you google "Jern Thunderbolt", last time I looked the instructions were still on line. I do not recall if the torque values were listed.
This page for the 1928 Chevrolet shows the settings for gap which should still be good for what you are working on;
Have you done the heat cool cycle on the aluminum plate before going on to mount the head?
The other thing you might try is google :mtfca; Chevrolet head". There are several people that have mounted his conversion, send a PM to them.
I have a bit of a different take on head bolt torque. If you have the original threads in the block, go no further than 45 ft lbs.
Agree with Richard. I pulled threads on half the head bolts in a 1913 block torqueing it to 50 LB - FT. If you helicoil all the holes then you can lessen that possibility.
I don't typically use a torque wrench on a Model T. I use a Ford head bolt wrench and good practices when installing. See here:
I'm about to reinstall a Z Head (aluminum) on my T. In my panic over the fear of making a mistake, I've kept a close eye on these discussions. I'm pretty sure that for my aluminum head, the torque is 45 ft/lb. And that for the steel heads, it's 5-10 higher.
There's also the discussion of re-tightening. I'd love some further discussion about this. I hear install, heat up engine, re-torque. I've also heard Install, heat up engine, complete cool down, re-torque.
This question has noting to do with Z heads or aluminum heads or cast iron heads. The question is what is the torque for the recessed cap screws holding the adapter plate to the T block or the bolts holding the Chevrolet head to the the adapter plate when using the Jern Thunderbolt aluminum adapter plate. If you don't know what the adapter plate is/was google it so you'll have a better understanding. While yes the 45 is good for "OTHER" application it may not be what Jern asked for in the His instructions.
I bet that you don't want to pull the threads out of the block. A head gasket is a head gasket.
While that may be true to a point, by time the approx 1 inch thick aluminum plate is counter sunk for the cap screws you only have about 5/8 thickness under the bolt head...Never mind. I hope he gets his answer.