253 and 308 crank-shaft what is differnce Options

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253tonner		#1 Posted : Monday, 5 May 2008 4:52:46 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 24/03/2008(UTC) Posts: 54		if putting 253 crank in 308 block can it be done i do know one is myrofoan seal and one is rope seal so can it be done thanks
		old holden rule v8 are the go who give's sh## about fuel
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HK1837		#2 Posted : Monday, 5 May 2008 5:59:54 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 558 time(s) in 533 post(s)		All 253/308 pre about 1972 are neoprene rear seal. After that they are rope. 253 and 304 and 308 cranks are different. The 5 litre cranks have heavier counterweights than the 253. The 304 and 308 cranks have different strokes (only just). ____________
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253tonner		#3 Posted : Monday, 5 May 2008 8:12:32 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 24/03/2008(UTC) Posts: 54		quote: Originally posted by Byron Rich All 253/308 pre about 1972 are neoprene rear seal. After that they are rope. 253 and 3
		old holden rule v8 are the go who give's sh## about fuel
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antoni		#4 Posted : Monday, 5 May 2008 8:59:53 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 31/08/2006(UTC) Posts: 108		Hi 253 crank would be to light, cost to much to rebalance the crank to suit the 308 pistions. 308 cranks are geting cheaper, need one do it for $35.00 304 for $45.00 0407 56 53 28 ps vic west side . melton.
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HK1837		#5 Posted : Monday, 5 May 2008 5:05:04 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 558 time(s) in 533 post(s)		As Antoni says, the weight is the difference. Stroke is the same except 304 is slightly less. _______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
		_______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?
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boom		#6 Posted : Tuesday, 6 May 2008 7:59:22 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 20/02/2006(UTC) Posts: 990		but the smaller stroke in turn gives a higher compression height due to same rods. 0.02" difference between pistons. In cubes we trust.
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mrhqute		#7 Posted : Tuesday, 6 May 2008 9:02:36 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 28/03/2008(UTC) Posts: 69		surely a smaller stroke must give a lesser comp height when using same rods and pistons.
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HK1837		#8 Posted : Tuesday, 6 May 2008 6:22:56 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 558 time(s) in 533 post(s)		304 uses a different piston to 308 due to the different stroke. 308 has a compression height of 1.69", and 304 of 1.71". Boom, yes you got it the wrong way around. _______________________________________________________ If we all had the same (good) Edited by user Wednesday, 7 May 2008 3:11:14 AM(UTC)  | Reason: Not specified
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boom		#9 Posted : Wednesday, 7 May 2008 2:33:36 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 20/02/2006(UTC) Posts: 990		i dont think i did. i said the smaller stroke gives a higher compression height. In cubes we trust.
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HK1837		#10 Posted : Wednesday, 7 May 2008 3:15:52 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 558 time(s) in 533 post(s)		I see what you mean now. I think mrhqute and myself read your post as "308 pistons in a 304 push the pistons up the bore", whereas the truth is the opposite. You said the same thing as me but it was confusing. __________________________________________
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boom		#11 Posted : Wednesday, 7 May 2008 3:56:40 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 20/02/2006(UTC) Posts: 990		ok my apologies. i see my blunder now! In cubes we trust.
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