Head Bolt Question
#1
Head Bolt Question
I have the Crane screw-in stud kit for my engine. The instructions recommend replacing the five bolts with reduced head bolts so one doesn't have to remove studs and guide plates to remove heads. I bought 10 allen head bolts of the same diameter but .25 shorter than the originals. I have 3 questions:
1. Does anyone think the shorter bolts will be an issue? (Im running the 268 Comp Cam and dished pistons in case your wondering about CR)
2. Dude behind the counter says the Allen bolts are better than Grade 8 bolts. Y'all think so????
3. Having a senior moment......do any head bolts need thread sealer???
I know ARP makes head bolts for this engine.....I'm trying to save a few bucks and some time. TIA for your input.
1. Does anyone think the shorter bolts will be an issue? (Im running the 268 Comp Cam and dished pistons in case your wondering about CR)
2. Dude behind the counter says the Allen bolts are better than Grade 8 bolts. Y'all think so????
3. Having a senior moment......do any head bolts need thread sealer???
I know ARP makes head bolts for this engine.....I'm trying to save a few bucks and some time. TIA for your input.
Last edited by 79F150400M; 06-29-2004 at 11:49 AM.
#3
#1: I don't have my book with me but if I remember correctly you are supposed to have a min of 1.5x the diameter of the fastener of engaged thread... you will have to verify/measure this yourself.
#2: IF there was something better than grade 8 then SAE would sure have a name for it. Beware of anything claiming to be better than grade 8. Stock ford bolts are of excellent quality anyway. If the fastener is not specifically called out for this application by the manufacturer, IMO, do not use it!
#3: I never have used a sealant and have not had any problems, but that doesn't make me right. I believe the book calls for sealant on those that penetrate the water jacket.
GL
#2: IF there was something better than grade 8 then SAE would sure have a name for it. Beware of anything claiming to be better than grade 8. Stock ford bolts are of excellent quality anyway. If the fastener is not specifically called out for this application by the manufacturer, IMO, do not use it!
#3: I never have used a sealant and have not had any problems, but that doesn't make me right. I believe the book calls for sealant on those that penetrate the water jacket.
GL
#4
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#7
I stand corrected, somewhat. SAE stops at grade 8. The cap screws do have a higher rating but are rated by different standards from ASTM, ANSI, and ASTM. The point I was trying to make was if you are going to replace a fastener, know what you are buying and from whom. Also, do we need to consider that if we use cap screws on one side of the head and stock bolts on the other, do the torque specs need to be different for the cap screws to get the same clamping force? does it matter?
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