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SB deck to head dowel pin sizing? #2781886 06/05/20 08:26 PM 06/05/20 08:26 PM
Joined: Jan 2003 Posts: 1,754 Windsor, ON, Canada D Diplomat360 OP top fuel
Diplomat360 OP top fuel D Joined: Jan 2003 Posts: 1,754 Windsor, ON, Canada	'74 360 block here...checked the hole diameter and it looks to be around .300-.310, however several on-line sources reference a 0.275" diameter pin (Mancini Racing), and yet there is the following Mr. Gasket part which is 0.310". Heck, this Pioneer Automotive set is a steal at $11 for 25 pcs! So what the heck is the right/correct dimension? I've never seen a wobbly dowel pin ever, so that 0.275" diameter seems not right.

Re: SB deck to head dowel pin sizing? [Re: Diplomat360] #2782043 06/06/20 10:40 AM 06/06/20 10:40 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	May I ask, how did you measure the hole? live every 24 hour block of time like it's your last day on earth

Re: SB deck to head dowel pin sizing? [Re: RapidRobert] #2782050 06/06/20 10:55 AM 06/06/20 10:55 AM
Joined: Jan 2003 Posts: 1,754 Windsor, ON, Canada D Diplomat360 OP top fuel
Diplomat360 OP top fuel D Joined: Jan 2003 Posts: 1,754 Windsor, ON, Canada	Originally Posted by RapidRobert May I ask, how did you measure the hole? Vernier caliper...I got between .300-.310 only because the dowel pin hole in the head is the .310" while the block is .300". Since I figure it's hard to expect the block to expand by 0.010" to make the larger diameter dowel pin fit, I better look at something around that .300" size, but the only thing I find in the right length is the .275" stuff.

Re: SB deck to head dowel pin sizing? [Re: Diplomat360] #2782055 06/06/20 11:04 AM 06/06/20 11:04 AM
Joined: Jan 2003 Posts: 10,702 North Dakota 6PakBee I Live Here
6PakBee I Live Here Joined: Jan 2003 Posts: 10,702 North Dakota	I've always had trouble measuring small holes with a caliper. I've resorted to using drill bits as an el-cheapo plug gauge. "We live in a time when intelligent people are being silenced so that stupid people won't be offended".

Re: SB deck to head dowel pin sizing? [Re: 6PakBee] #2782080 06/06/20 12:17 PM 06/06/20 12:17 PM
Joined: Jan 2003 Posts: 25,743 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,743 Rio Linda, CA	Pretty obvious that the nominal dimension is .3125" (5/16"). The INTERNET, the MISinformation superhighway

Re: SB deck to head dowel pin sizing? [Re: Diplomat360] #2782350 06/07/20 11:20 AM 06/07/20 11:20 AM
Joined: Apr 2003 Posts: 3,509 Tulsa, Oklahoma 340Cuda master
340Cuda master Joined: Apr 2003 Posts: 3,509 Tulsa, Oklahoma	Originally Posted by Diplomat360 '74 360 block here...checked the hole diameter and it looks to be around .300-.310, however several on-line sources reference a 0.275" diameter pin (Mancini Racing), and yet there is the following Mr. Gasket part which is 0.310". Heck, this Pioneer Automotive set is a steal at $11 for 25 pcs! So what the heck is the right/correct dimension? I've never seen a wobbly dowel pin ever, so that 0.275" diameter seems not right. I have a couple of the kits Mopar sells to finish out a new bare block. Freeze plugs, distributor bushing etc. The have two sets of dowel pins in them one set around .310 and some others closer to .275. Not sure where the small ones go.

Re: SB deck to head dowel pin sizing? [Re: 340Cuda] #2782416 06/07/20 02:56 PM 06/07/20 02:56 PM
Joined: Jan 2003 Posts: 20,163 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,163 Park Forest, IL	Locating pins for the timing chain cover? "Everybody funny, now you funny too."

Re: SB deck to head dowel pin sizing? [Re: slantzilla] #2782712 06/08/20 11:57 AM 06/08/20 11:57 AM
Joined: Apr 2003 Posts: 3,509 Tulsa, Oklahoma 340Cuda master
340Cuda master Joined: Apr 2003 Posts: 3,509 Tulsa, Oklahoma	Originally Posted by slantzilla Locating pins for the timing chain cover? That is kind of what I was thinking. That is kind of what I thought but isn't that a big block deal? My R3 block has no provision for them.

Re: SB deck to head dowel pin sizing? [Re: 340Cuda] #2782762 06/08/20 01:11 PM 06/08/20 01:11 PM
Joined: Jan 2003 Posts: 20,163 Park Forest, IL slantzilla Too Many Posts
slantzilla Too Many Posts Joined: Jan 2003 Posts: 20,163 Park Forest, IL	I don't remember if a small block has them or not. Slants do. "Everybody funny, now you funny too."

Re: SB deck to head dowel pin sizing? [Re: slantzilla] #2783166 06/09/20 11:41 AM 06/09/20 11:41 AM
Joined: Apr 2003 Posts: 3,509 Tulsa, Oklahoma 340Cuda master
340Cuda master Joined: Apr 2003 Posts: 3,509 Tulsa, Oklahoma	I am currently preping a never used R3 block. I had a lot of trouble getting the dowel pins in the driver's side deck. Even using a brass hammer I mushroomed the top of one. On the passenger side i placed the dowels in the -1 freezer for a couple days and they went in much better.

Re: SB deck to head dowel pin sizing? [Re: Diplomat360] #2783930 06/10/20 10:40 PM 06/10/20 10:40 PM
Joined: Jan 2003 Posts: 1,754 Windsor, ON, Canada D Diplomat360 OP top fuel
Diplomat360 OP top fuel D Joined: Jan 2003 Posts: 1,754 Windsor, ON, Canada	Thanks for the responses you guys. I ordered a couple of different part numbers, just a QTY of 1 or 2, so not a big spend. Once I get them here, will measure and try them out, and post the results, FYI if anything.

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