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Old 09-16-2010, 06:53 AM
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Strange Pushrod lenght difference between two SBC with same setup

Hi guys,this is strange,we have two SBCs , one 1987 L98 Corvette engine (mine) i have :

Lingenfelter 219 Camshaft
1.6 Crane Cams NSA Roller Rockers
1040 AFR 195 Heads (65cc)
Trick Flow Chrome Moly Pushrods 7.200



My pushrods are fine,in the tip center

My friend's block is a 14093638
he has everything i have but he is using #1034 AFR 195 Heads (75cc)
and his pushrods ended like this :




Thanks !!!

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Old 09-16-2010, 09:35 AM
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There's a few things that could possibly be the cause of this but I suspect that the bigger chamber on your friends heads sits the valves deeper in the chamber in relationship to the deck. Therefore on the rocker side of the head the tip of the valve is higher. or .... Did your friend order .100 longer valves on his heads? or .... have you had the decks of your block cut? Head gasket thickness?
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Old 09-16-2010, 09:43 AM
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Usually there's not two different castings for different chamber volumes. Your smaller chambers means your deck was cut to give that volume.

So like engineczar said, his "un-" or "less-cut" deck means everything sits higher in relationship to the deck- so this means HE needs longer p-rods to compensate for the amount that was NOT removed from his deck to arrive at HIS chamber volume.

This assumes the same length valves and no radically different valve jobs or different seat inserts or that sort of thing.

You might want to double check the p-rod lengths to be sure they're what they're supposed to be- just to be sure. Maybe even swap out a rocker arm from his to your engine to see if there was a running change made to them- but this is a real long shot.

Last edited by cobalt327; 09-16-2010 at 09:50 AM.
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Old 09-16-2010, 09:45 AM
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thanks !!!
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Old 09-16-2010, 10:29 AM
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Mostly any raised runner head calls for a longer pushrod. The 195 has a 3/4" in. thick head deck

This is from AFRs site,
Block and cylinder head deck heights, head gasket thickness, varying cams, rocker arms, and valve length can all affect pushrod lenght. Please see our follow best estimates. for 180 and 195cc heads typically a standard or .100 long pushrod works. For 210, 220, 227, or 235cc typically a .100 or .200 long pushrod will usually achieve proper geometry. For exact pushrod length we suggest using an adjustable pushrod to determine the proper lenght pushrod to be used. For detailed information on pushrod lenght, please view the FAQ section of our website.
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Old 09-16-2010, 03:48 PM
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Quote:
Originally Posted by Calderone
Hi guys,this is strange,we have two SBCs , one 1987 L98 Corvette engine (mine) i have :

Lingenfelter 219 Camshaft
1.6 Crane Cams NSA Roller Rockers
1040 AFR 195 Heads (65cc)
Trick Flow Chrome Moly Pushrods 7.200



My pushrods are fine,in the tip center

My friend's block is a 14093638
he has everything i have but he is using #1034 AFR 195 Heads (75cc)
and his pushrods ended like this :




Thanks !!!
The difference between engine builders and engine assemblers explained in pictures.

Bogie
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Old 09-16-2010, 06:03 PM
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Pretty simple to see the fix, pushrods are not long enough, for whatever reason. This is why you should always measure them with a checker, and buy them as the last piece in the build. Buy them before hand and you are just taking a WAG, even when all the parts "seem" the same as someone elses combo.

Bogie wins the "picture caption contest".

Are the rockers different brands?? They don't look to have the same shape, just same color.

Might just be camera angle, but you pushrods seem a little short too, maybe .050" too short?? His look to be .150" too short, just offhand.

Did you check them based off of centered contact on the tip, or for minimum sweep across the tip(smallest pattern)??

Last edited by ericnova72; 09-16-2010 at 06:11 PM.
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Old 09-16-2010, 07:19 PM
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he stated all the same BUT different heads,

qt:
My friend's block is a 14093638
he has everything i have but he is using #1034 AFR 195 Heads
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Old 09-16-2010, 08:43 PM
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Quote:
Originally Posted by 1BAD80
he stated all the same BUT different heads,

qt:
My friend's block is a 14093638
he has everything i have but he is using #1034 AFR 195 Heads

Both of those heads have the same size chambers. The only difference is that the #1040 are angle plug design.
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Old 09-16-2010, 09:10 PM
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My mistake , his are 1038's
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