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blackRA28 Forums Junkie Location: adelaide Registered: May 2002	Re: 18rg pistons, what kind? Wed, 06 July 2005 10:46 THE WITZL wrote on Thu, 13 February 2003 23:31 well.. i have a bit of info on the head numbers on 18R-G's that has helped answer some of my questions.... Quote: > Here's some head numbers off Al's 18RGs: > > 88250: > - 49657 single spring early rgu single dump ex ok head small studs on ex > - 52978 same as above > 88253: > - 73086 double spring late rgu good head to start with large studs on ex duel dump man > - 62744 single late rgu still good head may be small stud ex should be single dump > - 81784 double spring late also > - 87278 double spring late also > 88270: these are ale efi heads all double springs alll good heads these are the ones you use > - 35140 biggest ports biggest valves no smog ports best casting > - 08037 > - 49383 very late head newest ive seen > ?: > - 81225 same as above double late rgu if the head is a 11111-88253 not a 11111-88270 > 88253 88270s would be the heads of choice since these need very little work from the factory these willl make lots of power with little porting they will make a lot more power with a lot of porting the castings are a lot thicker around the ports so there is a lot of room the 88250s can be made good but the ex studs should be changed up to 10mm ones for best sealing all of these engines should have 8.5s to 1 but the efi 88270 heads they should have 8.3 to 1 just be glad you dont have any of those 11111-88230 or 88210 heads they are good paper weights hope this helps your info of what you got there sounds like my garage i think i have 15-18 heads right now cary [Report message to a moderator]

	Subject	Poster	Date
	18rg pistons, what kind?	ra40coupe	Tue, 05 July 2005 09:28
	Re: 18rg pistons, what kind?	TurboRG	Tue, 05 July 2005 18:07
	Re: 18rg pistons, what kind?	Mr DOHC	Wed, 06 July 2005 06:32
	Re: 18rg pistons, what kind?	ra40coupe	Wed, 06 July 2005 07:12
	Re: 18rg pistons, what kind?	Mr DOHC	Wed, 06 July 2005 08:25
	Re: 18rg pistons, what kind?	joecoolmk2	Wed, 06 July 2005 09:22
	Re: 18rg pistons, what kind?	blackRA28	Wed, 06 July 2005 09:45
	Re: 18rg pistons, what kind?	joecoolmk2	Wed, 06 July 2005 09:54
	Re: 18rg pistons, what kind?	ra40coupe	Wed, 06 July 2005 10:16
	Re: 18rg pistons, what kind?	joecoolmk2	Wed, 06 July 2005 10:27
	Re: 18rg pistons, what kind?	ra40coupe	Wed, 06 July 2005 10:31
	Re: 18rg pistons, what kind?	jeffro RA28	Wed, 06 July 2005 10:41
	Re: 18rg pistons, what kind?	blackRA28	Wed, 06 July 2005 10:46
	Re: 18rg pistons, what kind?	THE WITZL	Wed, 06 July 2005 11:24
	Re: 18rg pistons, what kind?	TurboRG	Thu, 07 July 2005 07:50
	Re: 18rg pistons, what kind?	ra40coupe	Thu, 07 July 2005 07:13

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