overlord Posted July 9, 2019 Report Share Posted July 9, 2019 I have been researching head bolt replacements for hours and made no progress. I have a 48 P-15 L type motor that I am replacing the head gasket on as soon as the machine shop is finished with it. The old bolts are just that. Old and pitted as well as mismatched. I have purchased and returned two sets of bolts claiming to be correct and still no success. I don't see any one else having this problem. What am I missing. The bolts are 7/16-14 with a body length of 1.6875" + a thread length of 1.125 =2.8125. The head thickness is 1.9062 . All told installed the threads are. 2187" longer than what is secured into the block. I can't find any vendors. I can't believe I am the only one to have this problem. Also, American made Grade 8, hex flange is preferred. I really need a hand with this quandary. Please help. Quote Link to comment Share on other sites More sharing options...
Mike36 Posted July 10, 2019 Report Share Posted July 10, 2019 Have you tried Andy Bernbaum ? Quote Link to comment Share on other sites More sharing options...
nkeiser Posted July 10, 2019 Report Share Posted July 10, 2019 I used these with no issues. https://www.summitracing.com/parts/PIO-PG-362-25/?rtype=10 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 10, 2019 Report Share Posted July 10, 2019 the head bolts all go into the water jacket with exception of 2-4-6 along the manifold side of the head, these thread into the intake ports. 1-3-5-7 manifold side go into the water jacket but at a more shallow depth than middle 7 and drivers side edge of the head but still quite a depth that the ones listed above should be no problem. There is also a probability that there may be some flashing from casting of the block below the threaded portion of the block that are the had bolt holes. Once should also chase these threads. Remember, use sealant on install.... Quote Link to comment Share on other sites More sharing options...
kencombs Posted July 10, 2019 Report Share Posted July 10, 2019 12 hours ago, nkeiser said: I used these with no issues. https://www.summitracing.com/parts/PIO-PG-362-25/?rtype=10 The description sounds right, but 'timing cover bolts'? Looks like they need to proofread the listing. Quote Link to comment Share on other sites More sharing options...
greg g Posted July 10, 2019 Report Share Posted July 10, 2019 I have the Pioneer :PG-362-25 in my engine 15 years 45000 miles no issues. You should have three or four different style bolts with a larger head which are drilled and taped to accept bolts. These are for accessory mounting and are pretty handy to have. Keep those. I used mine fo anchor home made dual carb inkage. Mine were installed just as they came from the box. There was a coating already on the threads so I just put them in regardless of whether they went into a water jacket or not. Also installed without washers. 1 Quote Link to comment Share on other sites More sharing options...
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